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Gao C, Wang J, Hübner R, Zhan J, Zhao M, Li Y, Cai B. Spin Effect to Regulate the Electronic Structure of Ir─Fe Aerogels for Efficient Acidic Water Oxidation. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2400875. [PMID: 38558285 DOI: 10.1002/smll.202400875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Revised: 03/08/2024] [Indexed: 04/04/2024]
Abstract
"Spin" has been recently reported as an important degree of electronic freedom to promote catalysis, yet how it influences electronic structure remains unexplored. This work reports the spin-induced orbital hybridization in Ir─Fe bimetallic aerogels, where the electronic structure of Ir sites is effectively regulated by tuning the spin property of Fe atoms. The spin-optimized electronic structure boosts oxygen evolution reaction (OER) electrocatalysis in acidic media, resulting in a largely improved catalytic performance with an overpotential of as low as 236 mV at 10 mA cm-2. Furthermore, the gelation kinetics for the aerogel synthesis is improved by an order of magnitude based on the introduction of a magnetic field. Density functional theory calculation reveals that the increased magnetic moment of Fe (3d orbital) changes the d-band structure (i.e., the d-band center and bandwidth) of Ir (5d orbital) via orbital hybridization, resulting in optimized binding of reaction intermediates. This strategy builds the bridge between the electron spin theory with the d-band theory and provides a new way for the design of high-performance electrocatalysts by using spin-induced orbital interaction.
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Affiliation(s)
- Cunyuan Gao
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China
| | - Juan Wang
- School of Physics, Shandong University, Jinan, 250100, China
| | - René Hübner
- Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - Jinhua Zhan
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China
| | - Mingwen Zhao
- School of Physics, Shandong University, Jinan, 250100, China
| | - Yangyang Li
- School of Physics, Shandong University, Jinan, 250100, China
| | - Bin Cai
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China
- Shenzhen Research Institute of Shandong University, Shenzhen, 518057, China
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2
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Sarkar R, Graves LS, Taylor JR, Arachchige IU. Self-Supported Ag/Pt/Pd Alloy Aerogels as High-Performance Bifunctional and Durable Electrocatalysts for Methanol and Ethanol Oxidation Reactions. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 37903332 DOI: 10.1021/acsami.3c07740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/01/2023]
Abstract
Assembly of nanoparticles (NPs) into functional macrostructures is imperative for the development of NP-based devices. However, existing methods employ insulating organic ligands, polymers, and biomolecules as mediators for the NP assembly, which are detrimental for charge transport and interparticle coupling that impede the efficient integration of low-dimensional properties. Herein, we report a methodology for the direct self-supported assembly of Ag/Pt/Pd alloy NPs into high surface area (119.1 ± 3.9 to 140.1 ± 5.7 m2/g), mesoporous (19.7 ± 6.2 to 23.0 ± 1.6 nm), and conducting nanostructures (aerogels) that show superior electrocatalytic activity and stability in methanol (MOR) and ethanol (EOR) oxidation reactions. Ultrasmall (3.9 ± 1.3 nm) and quasi-spherical Ag/Pt/Pd alloy NPs were synthesized via stepwise galvanic replacement reaction (GRR) of glutathione (GSH)-coated Ag NPs. As-synthesized NPs were transformed into free-standing alloy hydrogels via chemical oxidation of the GSH ligands. The composition of alloy aerogels was tuned by varying the oxidant/thiolate molar ratio of the precursor NP sol that prompts Ag dealloying with in situ generated HNO3, selectively enriching the Pt and Pd catalytic sites on the aerogel surface. The highest-performing alloy aerogel (Ag0.449Pt0.480Pd0.071) demonstrates excellent mass activity for methanol (3179.5 mA/mg) and ethanol (2444.5 mA/mg) electro-oxidation reactions, which are ∼4-5 times higher than those of commercial Pt/C and Pd/C electrocatalysts. The aerogel also maintained high alcohol oxidation activity for 17 h at a constant potential of -0.3 V in an alkaline medium. The synergistic effects of noble metal alloying, high surface area and mesoporosity, and the pristine active surface of aerogels provide efficient interaction of analytes with the nanostructure surface, facilitating both MOR and EOR activity and improving tolerance for poisonous byproducts, enabling the Ag/Pt/Pd alloy aerogel a promising (electro)catalyst for a number of new technologies.
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Affiliation(s)
- Rajib Sarkar
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006, United States
| | - Lisa S Graves
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006, United States
| | - Jessie R Taylor
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006, United States
| | - Indika U Arachchige
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006, United States
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3
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Xue G, Li Y, Du R, Wang J, Hübner R, Gao M, Hu Y. Leveraging Ligand and Composition Effects: Morphology-Tailorable Pt-Bi Bimetallic Aerogels for Enhanced (Photo-)Electrocatalysis. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2301288. [PMID: 37178409 DOI: 10.1002/smll.202301288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 04/28/2023] [Indexed: 05/15/2023]
Abstract
Metal aerogels (MAs) are emerging porous materials displaying unprecedented potential in catalysis, sensing, plasmonic technologies, etc. However, the lack of efficient regulation of their nano-building blocks (NBBs) remains a big hurdle that hampers the in-depth investigation and performance enhancement. Here, by harmonizing composition and ligand effects, Pt- and Bi-based single- and bimetallic aerogels bearing NBBs of controlled dimensions and shapes are obtained by facilely tuning the metal precursors and the applied ligands. Particularly, by further modulating the electronic and optic properties of the aerogels via adjusting the content of the catalytically active Pt component and the semiconducting Bi component, both the electrocatalytic and photoelectrocatalytic performance of the Pt-Bi aerogels can be manipulated. In this light, an impressive catalytic performance for electro-oxidation of methanol is acquired, marking a mass activity of 6.4-fold higher under UV irradiation than that for commercial Pt/C. This study not only sheds light on in situ manipulating NBBs of MAs, but also puts forward guidelines for crafting high-performance MAs-based electrocatalysts and photoelectrocatalysts toward energy-related electrochemical processes.
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Affiliation(s)
- Geng Xue
- Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325000, P. R. China
| | - Yueqi Li
- School of Materials Science and Engineering, Key Laboratory of High Energy Density Materials of the Ministry of Education, Beijing Institute of Technology, Beijing, 100081, P. R. China
| | - Ran Du
- School of Materials Science and Engineering, Key Laboratory of High Energy Density Materials of the Ministry of Education, Beijing Institute of Technology, Beijing, 100081, P. R. China
| | - Jinying Wang
- Network for Computational Nanotechnology, Purdue University, West Lafayette, IN, 47907, USA
| | - René Hübner
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstrasse 400, 01328, Dresden, Germany
| | - Meng Gao
- Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325000, P. R. China
| | - Yue Hu
- Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325000, P. R. China
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4
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Hou X, Song Y, Zhou H, Guo L, Li G, Tao Q. Chitosan coated fluorescent mesoporous silica for the sensitive and selective detection of H 2O 2. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 282:121661. [PMID: 35926287 DOI: 10.1016/j.saa.2022.121661] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 06/30/2022] [Accepted: 07/20/2022] [Indexed: 06/15/2023]
Abstract
A novel turn-on fluorescent sensor for hydrogen peroxide (H2O2) was prepared from chitosan (CS) coating mesoporous silica nanoparticles (MSNs) loaded with 1-(4-Aminophenyl)-1,2,2-triphenylethene (TPE-NH2) and silver nanoparticles (AgNCs). The surface of MSNs was coated by CS as the gatekeeper and the template for loading of AgNCs. Because of the surface plasmon-enhanced energy transfer (SPEET), AgNCs effectively quenched the fluorescence emission of nanoparticles. In the presence of H2O2, AgNCs can be oxidized to Ag+, resulting in the recovery of fluorescence. This fluorescent sensor was characterized with respect to its chemical composition, morphological features and optical properties by means of FTIR, XRD, TGA, SEM, TEM, XPS, UV-Vis and fluorescence spectroscopy. The MSN/TPE-CS@Ag nanoparticles showed good sensitivity and selectivity for H2O2 even with various interfering ions and agents. Under optimized conditions, the detection limit for H2O2 was 0.64 μM in the rage of 1-300 μM. The feasibility of the practical application of this probe was confirmed by accurate quantitative of H2O2 in practical samples.
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Affiliation(s)
- Xinhui Hou
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China
| | - Yifan Song
- Chu Kochen Honors College, Zhejiang University, Hangzhou 310058, China
| | - Hengquan Zhou
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China
| | - Lei Guo
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China
| | - Guiying Li
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China.
| | - Qian Tao
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China.
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5
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Zhang Y, Liu J, Kang YS, Zhang XL. Silver based photocatalysts in emerging applications. NANOSCALE 2022; 14:11909-11922. [PMID: 35959864 DOI: 10.1039/d2nr02665a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The infinite availability of solar energy grants the potential of fulfilling the energy demands and environmental sustainability requirements with more feasible and reliant renewable energy forms through photocatalysis. In the past decade, the intensive plasmonic effect, suitable work function, superior electrical conductivity and physiochemical properties have made Ag-based photocatalysts attractive components for emerging applications. The local surface plasmon resonance effect (LSPR) provides extra hot-carriers to participate in the photocatalytic process, and Schottky/Ohmic contacts would facilitate charge transfer. Here, recent studies focused on Ag-based photocatalysts for emerging applications are reviewed. Notably, the mechanisms of LSPR, the Schottky barrier and ohmic contacts are introduced together with urgent issues in CO2 reduction, antibacterial application, H2 generation, and environmental hazard removal. Additionally, some perspectives and directions on more comprehensive designs on material system, band alignment and functionalization are given to further the exploration in this research area.
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Affiliation(s)
- Yan Zhang
- School of Materials Science and Engineering, Zhengzhou University, 450001 Zhengzhou, P.R. China.
| | - Jian Liu
- Department of Chemical and Process Engineering, University of Surrey, GU2 7XH, UK
| | - Young Soo Kang
- Environmental and Climate Technology, Korea Institute of Energy Technology (KENTECH), 200 Hyeoksin-ro, Naju City, Jeollanamdo 58330, Korea
| | - Xiao Li Zhang
- School of Materials Science and Engineering, Zhengzhou University, 450001 Zhengzhou, P.R. China.
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6
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Noble metal aerogels rapidly synthesized by ultrasound for electrocatalytic reaction. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2021.09.104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Yan S, Mahyoub SA, Lin J, Zhang C, Hu Q, Chen C, Zhang F, Cheng Z. Au aerogel for selective CO 2electroreduction to CO: ultrafast preparation with high performance. NANOTECHNOLOGY 2021; 33:125705. [PMID: 34902843 DOI: 10.1088/1361-6528/ac4287] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Accepted: 12/13/2021] [Indexed: 06/14/2023]
Abstract
Noble metal aerogels (NMAs) have been used in a variety of (photo-)electrocatalytic reactions, but pure Au aerogel (AG) has not been used in CO2electroreduction to date. To explore the potential application in this direction, AG was prepared to be used as the cathode in CO2electroreduction to CO. However, the gelation time of NMAs is usually very long, up to several weeks. Here, an excess NaBH4and turbulence mixing-promoted gelation approach was developed by introducing magnetic stirring as an external force field, which therefore greatly shortened the formation time of Au gels to several seconds. The AG-3 (AG with Au loading of 0.003 g) exhibited a high CO Faradaic efficiency (FE) of 95.6% at an extremely low overpotential of 0.39 V, and over 91% of CO FE was reached in a wide window of -0.4 to -0.7 V versus the reversible hydrogen electrode (RHE). Partial current density in CO was measured to be -19.35 mA cm-2at -0.8 V versus RHE under 1 atm of CO2. The excellent performance should be ascribed to its porous structure, abundant active sites, and large electrochemical active surface area. It provides a new method for preparation of AG with ultrafast gelation time and large production at room temperature, and the resulting pure AG was for the first time used in the field of CO2electroreduction.
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Affiliation(s)
- Shenglin Yan
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
| | - Samah A Mahyoub
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
| | - Jing Lin
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
| | - Chunxiao Zhang
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
| | - Qing Hu
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
| | - Chengzhen Chen
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
| | - Fanghua Zhang
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
| | - Zhenmin Cheng
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
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8
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Zhou Z, Shen Z, Song C, Li M, Li H, Zhan S. Boosting the activation of molecular oxygen and the degradation of tetracycline over high loading Ag single atomic catalyst. WATER RESEARCH 2021; 201:117314. [PMID: 34146763 DOI: 10.1016/j.watres.2021.117314] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 05/25/2021] [Accepted: 05/26/2021] [Indexed: 06/12/2023]
Abstract
Photocatalytic activation of molecular oxygen (O2) is a promising way in oxidative degradation of organic pollutants. However, it suffers from low efficiency mainly due to the limited active sites for O2 activation over traditional photocatalysts. Therefore, we established a single atomic Ag-g-C3N4 (SAACN) catalyst with 10 wt% loading of Ag single sites for boosting the O2 activation during the degradation of tetracycline (TC), and 10 wt% loading of nanoparticle Ag-g-C3N4 (NPACN) was studied as a comparison. When using SAACN, the accumulative concentration of superoxide (•O2-), hydroxyl radical (•OH), singlet oxygen (1O2) reached up to 0.66, 0.19, 0.33 mmol L-1h-1, respectively, within 120 min, 11.7, 5.7 and 4.9 times compared with those using NPACN, representing 17.24% of dissolved O2 was converted to reactive oxygen species (ROS). When additionally feeding air or O2, the accumulative concentrations of •O2-, •OH, 1O2 were even higher (air: 4.21, 0.97, 2.02 mmol L-1 h-1; O2: 17.13, 1.32, 9.00 mmol L-1 h-1). The rate constants (k) for degrading the TC were 0.0409 min-1 over SAACN and 0.00880 min-1 over NPACN, respectively (mineralization rate: 95.7% vs. 59.9% after 3 h of degradation). Moreover, the degradation ability of SAACN did not decrease in a wide range of pH value (4-10) or under low temperature (10 °C). Besides the high exposure of Ag single sites, other advances of SAACN were: 1(O2 was more energetic favorable to adsorb on single atomic Ag sites; 2) Positive Ag single sites were easier to obtain the electrons from the surrounding N atoms, and facilitated electron transfer towards adsorbed O2.
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Affiliation(s)
- Zhiruo Zhou
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Zhurui Shen
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; School of Materials Science and Engineering, Nankai University, Tianjin 300350, China.
| | - Chunlin Song
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Mingmei Li
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Hui Li
- School of Materials Science and Engineering, Nankai University, Tianjin 300350, China
| | - Sihui Zhan
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Tianjin Key Lab for Rare Earth Materials and Applications, Tianjin 300072, China.
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Wang H, Fang Q, Gu W, Du D, Lin Y, Zhu C. Noble Metal Aerogels. ACS APPLIED MATERIALS & INTERFACES 2020; 12:52234-52250. [PMID: 33174718 DOI: 10.1021/acsami.0c14007] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Noble metal-based nanomaterials have been a hot research topic during the past few decades. Particularly, self-assembled porous architectures have triggered tremendous interest. At the forefront of porous nanostructures, there exists a research endeavor of noble metal aerogels (NMAs), which are unique in terms of macroscopic assembly systems and three-dimensional (3D) porous network nanostructures. Combining excellent features of noble metals and the unique structural traits of porous nanostructures, NMAs are of high interest in diverse fields, such as catalysis, sensors, and self-propulsion devices. Regardless of these achievements, it is still challenging to rationally design well-tailored NMAs in terms of ligament sizes, morphologies, and compositions and profoundly investigate the underlying gelation mechanisms. Herein, an elaborate overview of the recent progress on NMAs is given. First, a simple description of typical synthetic methods and some advanced design engineering are provided, and then, the gelation mechanism models of NMAs are discussed in detail. Furthermore, promising applications particularly focusing on electrocatalysis and biosensors are highlighted. In the final section, brief conclusions and an outlook on the existing challenges and future chances of NMAs are also proposed.
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Affiliation(s)
- Hengjia Wang
- College of Chemistry, Central China Normal University, Wuhan 430079, P.R. China
| | - Qie Fang
- College of Chemistry, Central China Normal University, Wuhan 430079, P.R. China
| | - Wenling Gu
- College of Chemistry, Central China Normal University, Wuhan 430079, P.R. China
| | - Dan Du
- School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, United States
| | - Yuehe Lin
- School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164, United States
| | - Chengzhou Zhu
- College of Chemistry, Central China Normal University, Wuhan 430079, P.R. China
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Abstract
Nanomaterials are widely used in electrocatalysts due to their quantum size effect and high utilization efficiency. There are two ways to improve the activity of nanoelectrocatalysts: increasing the number of active sites and improving the inherent activity of each catalytic site. The structure of the catalyst itself can be improved by increasing the number of exposed active sites per unit mass. The high porosity and three-dimensional network structure enable aerogels to have the characteristics of a large specific surface area, exposing many active sites and bringing structural stability through the self-supporting nature of aerogels. Thus, by adjusting the compositions of aerogels, the synergetic effect introduced by alloy elements can be utilized to further improve the single-site activity. In this review, we summarized the basic preparation strategy of aerogels and extended it to the preparation of alloys and special structure aerogels. Moreover, through the eight electrocatalysis cases, the outstanding catalytic performances and broad applicability of aerogel electrocatalysts are emphasized. Finally, we predict the future development of pure metallic aerogel electrocatalysts from the perspective of preparation to application.
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Rusch P, Zámbó D, Bigall NC. Control over Structure and Properties in Nanocrystal Aerogels at the Nano-, Micro-, and Macroscale. Acc Chem Res 2020; 53:2414-2424. [PMID: 33030336 PMCID: PMC7581295 DOI: 10.1021/acs.accounts.0c00463] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
![]()
The assembly
of individual colloidal nanocrystals into macroscopic
solvogels and aerogels introduced a new exciting type of material
into the class of porous architectures. In these so-called nanocrystal
gels, the structure and properties can be controlled and fine-tuned
to the smallest details. Recently it was shown that by employing nanocrystal
building blocks for such gel materials, the interesting nanoscopic
properties can be conserved or even expanded to properties that are
available neither in the nanocrystals nor in their respective bulk
materials. In general, the production of these materials features
the wet-chemical synthesis of stable nanocrystal colloids followed
by their carefully controlled destabilization to facilitate arrangement
of the nanocrystals into highly porous, interconnected networks. By
isolation of the synthesis of the discrete building blocks from the
assembly process, the electronic structure, optical properties, and
structural morphology can be tailored by the myriad of procedures
developed in colloidal nanocrystal chemistry. Furthermore, knowledge
and control over the structure–property correlation in the
resulting gel structures opens up numerous new ways for extended and
advanced applications. Consequently, the amount of different materials
converted to nanocrystal-based gel structures is rising steadily.
Meanwhile the number of methods for assembly initiation is likewise
increasing, offering control over the overall network structure and
porosity as well as the individual nanocrystal building block connection.
The resulting networks can be dried by different methods to obtain
highly porous air-filled networks (aerogels) or applied in their wet
form (solvogels). By now a number of different applications profiting
from the unique advantages of nanocrystal-based gel materials have
been realized and exploited in the areas of photocatalysis, electrocatalysis,
and sensing. In this Account, we aim to summarize the efforts
undertaken in
the structuring of nanocrystal-based network materials on different
scales, fine-tuning of the individual building blocks on the nanoscale,
the network connections on the microscale, and the macroscale structure
and shape of the final construct. It is exemplarily demonstrated how
cation exchange reactions (at the nanoscale), postgelation modifications
on the nanocrystal networks (microscale), and the structuring of the
gels via printing techniques (macroscale) endow the resulting nanocrystal
gel networks with novel physicochemical, mechanical, and electrocatalytic
properties. The methods applied in the more traditional sol–gel
chemistry targeting micro- and macroscale structuring are also reviewed,
showing their future potential promoting the field of nanocrystal-based
aerogels and their applications.
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Affiliation(s)
- Pascal Rusch
- Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, Callinstraße 3A, 30167 Hannover, Germany
| | - Dániel Zámbó
- Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, Callinstraße 3A, 30167 Hannover, Germany
| | - Nadja C. Bigall
- Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, Callinstraße 3A, 30167 Hannover, Germany
- Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering − Innovation Across Disciplines), 30167 Hannover, Germany
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Li X, Zhang T, Yu J, Xing C, Li X, Cai W, Li Y. Highly Selective and Sensitive Detection of Hydrogen Sulfide by the Diffraction Peak of Periodic Au Nanoparticle Array with Silver Coating. ACS APPLIED MATERIALS & INTERFACES 2020; 12:40702-40710. [PMID: 32814430 DOI: 10.1021/acsami.0c12557] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
The two-dimensional (2D) periodic Au nanosphere array with silver coating was prepared by using a colloidal monolayer template to obtain a Au nanosphere array and subsequently depositing silver thin coating on it, which could be used as an optical sensor to effectively detect H2S. Such periodic Au nanosphere array with silver coating displayed a surface plasmonic resonance (SPR) peak and an optical diffraction peak. Compared with the SPR peak, the diffraction peak, originated from the periodic arrangements of the obtained array, demonstrated a more sensitive optical change to detect H2S with a significant redshift as the H2S concentration increased. It was attributed to the increase of the refractive index of the environment around the Au nanosphere arrays with silver coating due to the partial formation of Ag2S after detecting H2S. Furthermore, the H2S sensor based on the change of the optical diffraction peak, showed an excellent selectivity and it was very sensitive to detect H2S from 2 to 30 μM. This method was investigated by the analysis in H2S-spiked blood samples, which indicates that the method has the potential to detect H2S in blood samples. The presented work provides a new strategy of utilizing the optical diffraction peak of the periodic array to develop promising sensors.
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Affiliation(s)
- Xuejiao Li
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, HIPS, Chinese Academy of Sciences, Hefei 230031, P.R. China
- University of Science and Technology of China, Hefei 230026, P.R. China
| | - Tao Zhang
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, HIPS, Chinese Academy of Sciences, Hefei 230031, P.R. China
| | - Jie Yu
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, HIPS, Chinese Academy of Sciences, Hefei 230031, P.R. China
- University of Science and Technology of China, Hefei 230026, P.R. China
| | - Changchang Xing
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, HIPS, Chinese Academy of Sciences, Hefei 230031, P.R. China
- University of Science and Technology of China, Hefei 230026, P.R. China
| | - Xinyang Li
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, HIPS, Chinese Academy of Sciences, Hefei 230031, P.R. China
| | - Weiping Cai
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, HIPS, Chinese Academy of Sciences, Hefei 230031, P.R. China
| | - Yue Li
- Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, HIPS, Chinese Academy of Sciences, Hefei 230031, P.R. China
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13
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Pan B, Chen F, Kou B, Wang J, Tang Q, Guo L, Wang Q, Li Z, Bian W, Wang J. Unexpectedly high stability and surface reconstruction of PdAuAg nanoparticles for formate oxidation electrocatalysis. NANOSCALE 2020; 12:11659-11671. [PMID: 32436927 DOI: 10.1039/d0nr01358g] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
High-performance Pd-based nanocatalysts for alkaline methanol and formate fuel cells have stimulated widespread attention. Hence, a series of ternary Pd-Au-Ag nanoalloys have been synthesized on carbon nanotubes, which demonstrate promising activity and unexpectedly high stability for the formate oxidation reaction (FOR) in alkaline medium. The ternary Pd3Au3Ag1 nanoalloy catalyst showed an initial mass activity of 4.51 A mgPd-1 and a retained mass activity of 1.32 A mgPd-1 after chronoamperometric measurement for 3600 s, which are superior to the best values for all FOR catalysts reported so far. The Pd3Au3Ag1 catalyst also showed a good specific activity of 4.32 mA cm-2 for the methanol oxidation reaction. Furthermore, surface reconstruction of the Pd3Au3Ag1 nanoalloy was observed during FOR, where the activity of Pd3Au3Ag1 catalysts increased up to 33% and the cycling durability retained 55% after cyclic voltammetry with the upper potential of 1.7 V. The FOR enhancement is attributed to the formation of mixed oxidation-state Ag sites and the increase in the Pd surface coverage, and provides a new prospect for the design of ternary nanoalloy electrocatalysts for various fuel oxidation reactions.
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Affiliation(s)
- Bowei Pan
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, 710072, China. and School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, China
| | - Fuyi Chen
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, 710072, China. and School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, China
| | - Bo Kou
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, China
| | - Junpeng Wang
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, China
| | - Quan Tang
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, 710072, China. and School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, China
| | - Longfei Guo
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, 710072, China. and School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, China
| | - Qiao Wang
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, 710072, China. and School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, China
| | - Zhen Li
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, China
| | - Weiqi Bian
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, China
| | - Jiali Wang
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, 710072, China. and School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, China
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14
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Liu J, Hong Z, Yang W, Liu C, Lu Z, Wu L, Foda MF, Yang Z, Han H, Zhao Y. Bacteria Inspired Internal Standard SERS Substrate for Quantitative Detection. ACS APPLIED BIO MATERIALS 2020; 4:2009-2019. [DOI: 10.1021/acsabm.0c00263] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Jiawei Liu
- State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan 430070, People’s Republic of China
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
| | - Zilan Hong
- State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan 430070, People’s Republic of China
| | - Weimin Yang
- Department of Physics, Xiamen University, Xiamen 361005, People’s Republic of China
| | - Chen Liu
- Leibniz Institute of Photonic Technology Jena—Member of the Research Alliance “Leibniz Health Technologies”, Jena 07745, Germany
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Jena 07743, Germany
| | - Zhicheng Lu
- State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan 430070, People’s Republic of China
| | - Long Wu
- State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan 430070, People’s Republic of China
| | - Mohamed F. Foda
- State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan 430070, People’s Republic of China
| | - Zhilin Yang
- Department of Physics, Xiamen University, Xiamen 361005, People’s Republic of China
| | - Heyou Han
- State Key Laboratory of Agricultural Microbiology, College of Science, Huazhong Agricultural University, Wuhan 430070, People’s Republic of China
| | - Yanli Zhao
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
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15
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Du R, Joswig JO, Hübner R, Zhou L, Wei W, Hu Y, Eychmüller A. Freeze-Thaw-Promoted Fabrication of Clean and Hierarchically Structured Noble-Metal Aerogels for Electrocatalysis and Photoelectrocatalysis. Angew Chem Int Ed Engl 2020; 59:8293-8300. [PMID: 32187791 PMCID: PMC7317422 DOI: 10.1002/anie.201916484] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 02/22/2020] [Indexed: 11/17/2022]
Abstract
Noble‐metal aerogels (NMAs) have drawn increasing attention because of their self‐supported conductive networks, high surface areas, and numerous optically/catalytically active sites, enabling their impressive performance in diverse fields. However, the fabrication methods suffer from tedious procedures, long preparation times, unavoidable impurities, and uncontrolled multiscale structures, discouraging their developments. By utilizing the self‐healing properties of noble‐metal aggregates, the freezing‐promoted salting‐out behavior, and the ice‐templating effect, a freeze–thaw method is crafted that is capable of preparing various hierarchically structured noble‐metal gels within one day without extra additives. In light of their cleanliness, the multi‐scale structures, and combined catalytic/optical properties, the electrocatalytic and photoelectrocatalytic performance of NMAs are demonstrated, which surpasses that of commercial noble‐metal catalysts.
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Affiliation(s)
- Ran Du
- Physical Chemistry, Technische Universität Dresden, Bergstr. 66b, 01069, Dresden, Germany
| | - Jan-Ole Joswig
- Theoretische Chemie, Fakultät für Chemie und Lebensmittelchemie, Technische Universität Dresden, 01062, Dresden, Germany
| | - René Hübner
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstrasse 400, 01328, Dresden, Germany
| | - Lin Zhou
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325000, China
| | - Wei Wei
- Physical Chemistry, Technische Universität Dresden, Bergstr. 66b, 01069, Dresden, Germany
| | - Yue Hu
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325000, China
| | - Alexander Eychmüller
- Physical Chemistry, Technische Universität Dresden, Bergstr. 66b, 01069, Dresden, Germany
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16
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Du R, Joswig J, Hübner R, Zhou L, Wei W, Hu Y, Eychmüller A. Freeze–Thaw‐Promoted Fabrication of Clean and Hierarchically Structured Noble‐Metal Aerogels for Electrocatalysis and Photoelectrocatalysis. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201916484] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ran Du
- Physical ChemistryTechnische Universität Dresden Bergstr. 66b 01069 Dresden Germany
| | - Jan‐Ole Joswig
- Theoretische Chemie, Fakultät für Chemie und LebensmittelchemieTechnische Universität Dresden 01062 Dresden Germany
| | - René Hübner
- Helmholtz-Zentrum Dresden-RossendorfInstitute of Ion Beam Physics and Materials Research Bautzner Landstrasse 400 01328 Dresden Germany
| | - Lin Zhou
- College of Chemistry and Materials EngineeringWenzhou University Wenzhou 325000 China
| | - Wei Wei
- Physical ChemistryTechnische Universität Dresden Bergstr. 66b 01069 Dresden Germany
| | - Yue Hu
- College of Chemistry and Materials EngineeringWenzhou University Wenzhou 325000 China
| | - Alexander Eychmüller
- Physical ChemistryTechnische Universität Dresden Bergstr. 66b 01069 Dresden Germany
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17
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Du R, Joswig JO, Fan X, Hübner R, Spittel D, Hu Y, Eychmüller A. Disturbance-Promoted Unconventional and Rapid Fabrication of Self-Healable Noble Metal Gels for (Photo-)Electrocatalysis. MATTER 2020; 2:908-920. [PMID: 32270137 PMCID: PMC7115346 DOI: 10.1016/j.matt.2020.01.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 11/18/2019] [Accepted: 01/02/2020] [Indexed: 05/27/2023]
Abstract
As an emerging class of porous materials, noble metal aerogels (NMAs) have drawn tremendous attention and displayed unprecedented potential in diverse fields. However, the development of NMAs is impeded by the fabrication methods because of their time- and cost-consuming procedures, limited generality, and elusive understanding of the formation mechanisms. Here, by revealing the self-healing behavior of noble metal gels and applying it in the gelation process at a disturbing environment, an unconventional and conceptually new strategy, i.e., a disturbance-promoted gelation method, is developed by introducing an external force field. It overcomes the diffusion limitation in the gelation process, thus producing monolithic gels within 1-10 min at room temperature, 2-4 orders of magnitude faster than for most reported methods. Moreover, versatile NMAs are acquired by using this method, and their superior (photo-)electrocatalytic properties are demonstrated for the first time in light of combined catalytic and optic properties.
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Affiliation(s)
- Ran Du
- Physical Chemistry, Technische Universität Dresden, Bergstrasse 66b, 01069 Dresden, Germany
| | - Jan-Ole Joswig
- Theoretische Chemie, Fakultät für Chemie und Lebensmittelchemie, Technische Universität Dresden, 01062 Dresden, Germany
| | - Xuelin Fan
- Physical Chemistry, Technische Universität Dresden, Bergstrasse 66b, 01069 Dresden, Germany
| | - René Hübner
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstrasse 400, 01328 Dresden, Germany
| | - Daniel Spittel
- Physical Chemistry, Technische Universität Dresden, Bergstrasse 66b, 01069 Dresden, Germany
| | - Yue Hu
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325000, China
| | - Alexander Eychmüller
- Physical Chemistry, Technische Universität Dresden, Bergstrasse 66b, 01069 Dresden, Germany
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18
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Chen Y, Feng L. Silver nanoparticles doped TiO2 catalyzed Suzuki-coupling of bromoaryl with phenylboronic acid under visible light. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2020; 205:111807. [DOI: 10.1016/j.jphotobiol.2020.111807] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 01/04/2020] [Accepted: 01/24/2020] [Indexed: 01/11/2023]
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19
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Du R, Wang J, Wang Y, Hübner R, Fan X, Senkovska I, Hu Y, Kaskel S, Eychmüller A. Unveiling reductant chemistry in fabricating noble metal aerogels for superior oxygen evolution and ethanol oxidation. Nat Commun 2020; 11:1590. [PMID: 32221287 PMCID: PMC7101436 DOI: 10.1038/s41467-020-15391-w] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Accepted: 02/25/2020] [Indexed: 02/07/2023] Open
Abstract
Amongst various porous materials, noble metal aerogels attract wide attention due to their concurrently featured catalytic properties and large surface areas. However, insufficient understanding and investigation of key factors (e.g. reductants and ligands) in the fabrication process limits on-target design, impeding material diversity and available applications. Herein, unveiling multiple roles of reductants, we develop an efficient method, i.e. the excessive-reductant-directed gelation strategy. It enables to integrate ligand chemistry for creating gold aerogels with a record-high specific surface area (59.8 m2 g-1), and to expand the composition to all common noble metals. Moreover, we demonstrate impressive electrocatalytic performance of these aerogels for the ethanol oxidation and oxygen evolution reaction, and discover an unconventional organic-ligand-enhancing effect. The present work not only enriches the composition and structural diversity of noble metal aerogels, but also opens up new dimensions for devising efficient electrocatalysts for broad material systems.
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Affiliation(s)
- Ran Du
- Physical Chemistry, Technische Universität Dresden, Bergstr. 66b, 01069, Dresden, Germany
| | - Jinying Wang
- Network for Computational Nanotechnology, Purdue University, West Lafayette, IN, 47907, USA
| | - Ying Wang
- College of Chemistry and Materials Engineering, Wenzhou University, 325000, Wenzhou, China
| | - René Hübner
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstrasse 400, 01328, Dresden, Germany
| | - Xuelin Fan
- Physical Chemistry, Technische Universität Dresden, Bergstr. 66b, 01069, Dresden, Germany
| | - Irena Senkovska
- Department of Inorganic Chemistry, Technische Universität Dresden, Bergstr. 66b, 01062, Dresden, Germany
| | - Yue Hu
- College of Chemistry and Materials Engineering, Wenzhou University, 325000, Wenzhou, China.
| | - Stefan Kaskel
- Department of Inorganic Chemistry, Technische Universität Dresden, Bergstr. 66b, 01062, Dresden, Germany
| | - Alexander Eychmüller
- Physical Chemistry, Technische Universität Dresden, Bergstr. 66b, 01069, Dresden, Germany.
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20
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Lübkemann F, Rusch P, Getschmann S, Schremmer B, Schäfer M, Schulz M, Hoppe B, Behrens P, Bigall NC, Dorfs D. Reversible cation exchange on macroscopic CdSe/CdS and CdS nanorod based gel networks. NANOSCALE 2020; 12:5038-5047. [PMID: 32067005 DOI: 10.1039/c9nr09875e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Over the past decades, cation exchange reactions applied to nanoparticles have opened up synthetic pathways to nanocrystals, which were not accessible by other means before. The limitation of cation exchange on the macroscopic scale of bulk materials is given by the limited ion diffusion within the crystal structure. Lyogels or aerogels are macroscopic, highly voluminous, porous materials composed of interconnected nanoscopic building blocks and hence represent a type of bridge between the macroscopic and the nanoscopic world. To demonstrate the feasibility of cation exchange on such macroscopic nanomaterials, the cation exchange on CdSe/CdS core/shell and CdS nanorod based lyogels to Cu2-xSe/Cu2-xS and Cu2-xS and the reversible exchange back to CdSe/CdS and CdS lyogels is presented. These copper-based lyogels can also be used as an intermediate state on the way to other metal chalcogenide-based macroscopic structures. By reversed cation exchange back to cadmium an additional proof is given, that the crystal structures remain unchanged. It is shown that cation exchange reactions can also be transferred to macroscopic objects like aerogels or lyogels. This procedure additionally allows the access of aerogels which cannot be synthesized via direct destabilization of the respective colloidal solutions.
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Affiliation(s)
- Franziska Lübkemann
- Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, Callinstraße 3A, 30167 Hannover, Germany. and Laboratory of Nano and Quantum Engineering, Leibniz Universität Hannover, Schneiderberg 39, 30167 Hannover, Germany
| | - Pascal Rusch
- Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, Callinstraße 3A, 30167 Hannover, Germany. and Laboratory of Nano and Quantum Engineering, Leibniz Universität Hannover, Schneiderberg 39, 30167 Hannover, Germany
| | - Sven Getschmann
- Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, Callinstraße 3A, 30167 Hannover, Germany. and Laboratory of Nano and Quantum Engineering, Leibniz Universität Hannover, Schneiderberg 39, 30167 Hannover, Germany
| | - Björn Schremmer
- Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, Callinstraße 3A, 30167 Hannover, Germany. and Laboratory of Nano and Quantum Engineering, Leibniz Universität Hannover, Schneiderberg 39, 30167 Hannover, Germany
| | - Malte Schäfer
- Laboratory of Nano and Quantum Engineering, Leibniz Universität Hannover, Schneiderberg 39, 30167 Hannover, Germany and Institute for Inorganic Chemistry, Leibniz Universität Hannover, Callinstraße 9, 30167 Hannover, Germany
| | - Marcel Schulz
- Laboratory of Nano and Quantum Engineering, Leibniz Universität Hannover, Schneiderberg 39, 30167 Hannover, Germany and Institute for Inorganic Chemistry, Leibniz Universität Hannover, Callinstraße 9, 30167 Hannover, Germany
| | - Bastian Hoppe
- Institute for Inorganic Chemistry, Leibniz Universität Hannover, Callinstraße 9, 30167 Hannover, Germany
| | - Peter Behrens
- Laboratory of Nano and Quantum Engineering, Leibniz Universität Hannover, Schneiderberg 39, 30167 Hannover, Germany and Institute for Inorganic Chemistry, Leibniz Universität Hannover, Callinstraße 9, 30167 Hannover, Germany and Cluster of Excellency PhoenixD (Photonics, Optics, and Engineering - Innovation Across Disciplines), Hannover, Germany
| | - Nadja C Bigall
- Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, Callinstraße 3A, 30167 Hannover, Germany. and Laboratory of Nano and Quantum Engineering, Leibniz Universität Hannover, Schneiderberg 39, 30167 Hannover, Germany and Cluster of Excellency PhoenixD (Photonics, Optics, and Engineering - Innovation Across Disciplines), Hannover, Germany
| | - Dirk Dorfs
- Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, Callinstraße 3A, 30167 Hannover, Germany. and Laboratory of Nano and Quantum Engineering, Leibniz Universität Hannover, Schneiderberg 39, 30167 Hannover, Germany and Cluster of Excellency PhoenixD (Photonics, Optics, and Engineering - Innovation Across Disciplines), Hannover, Germany
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21
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Fan X, Zerebecki S, Du R, Hübner R, Marzum G, Jiang G, Hu Y, Barcikowki S, Reichenberger S, Eychmüller A. Promoting the Electrocatalytic Performance of Noble Metal Aerogels by Ligand‐Directed Modulation. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201913079] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Xuelin Fan
- Physical Chemistry Technische Universität Dresden Bergstr. 66b 01069 Dresden Germany
| | - Swen Zerebecki
- Technical Chemistry and Center for Nanointegration Duisburg-Essen University of Duisburg-Essen 47057 Duisburg Germany
| | - Ran Du
- Physical Chemistry Technische Universität Dresden Bergstr. 66b 01069 Dresden Germany
| | - René Hübner
- Helmholtz-Zentrum Dresden-Rossendorf Institute of Ion Beam Physics and Materials Research Bautzner Landstrasse 400 01328 Dresden Germany
| | - Galina Marzum
- Technical Chemistry and Center for Nanointegration Duisburg-Essen University of Duisburg-Essen 47057 Duisburg Germany
| | - Guocan Jiang
- Physical Chemistry Technische Universität Dresden Bergstr. 66b 01069 Dresden Germany
| | - Yue Hu
- College of Chemistry and Materials Engineering Wenzhou University Wenzhou 325000 China
| | - Stephan Barcikowki
- Technical Chemistry and Center for Nanointegration Duisburg-Essen University of Duisburg-Essen 47057 Duisburg Germany
| | - Sven Reichenberger
- Technical Chemistry and Center for Nanointegration Duisburg-Essen University of Duisburg-Essen 47057 Duisburg Germany
| | - Alexander Eychmüller
- Physical Chemistry Technische Universität Dresden Bergstr. 66b 01069 Dresden Germany
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22
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Fan X, Zerebecki S, Du R, Hübner R, Marzum G, Jiang G, Hu Y, Barcikowki S, Reichenberger S, Eychmüller A. Promoting the Electrocatalytic Performance of Noble Metal Aerogels by Ligand-Directed Modulation. Angew Chem Int Ed Engl 2020; 59:5706-5711. [PMID: 31990450 PMCID: PMC7154742 DOI: 10.1002/anie.201913079] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2019] [Indexed: 12/11/2022]
Abstract
Noble metal aerogels (NMAs) are an emerging class of porous materials. Embracing nano-sized highly-active noble metals and porous structures, they display unprecedented performance in diverse electrocatalytic processes. However, various impurities, particularly organic ligands, are often involved in the synthesis and remain in the corresponding products, hindering the investigation of the intrinsic electrocatalytic properties of NMAs. Here, starting from laser-generated inorganic-salt-stabilized metal nanoparticles, various impurity-free NMAs (Au, Pd, and Au-Pd aerogels) were fabricated. In this light, we demonstrate not only the intrinsic electrocatalytic properties of NMAs, but also the prominent roles played by ligands in tuning electrocatalysis through modulating the electron density of catalysts. These findings may offer a new dimension to engineer and optimize the electrocatalytic performance for various NMAs and beyond.
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Affiliation(s)
- Xuelin Fan
- Physical Chemistry, Technische Universität Dresden, Bergstr. 66b, 01069, Dresden, Germany
| | - Swen Zerebecki
- Technical Chemistry and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, 47057, Duisburg, Germany
| | - Ran Du
- Physical Chemistry, Technische Universität Dresden, Bergstr. 66b, 01069, Dresden, Germany
| | - René Hübner
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstrasse 400, 01328, Dresden, Germany
| | - Galina Marzum
- Technical Chemistry and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, 47057, Duisburg, Germany
| | - Guocan Jiang
- Physical Chemistry, Technische Universität Dresden, Bergstr. 66b, 01069, Dresden, Germany
| | - Yue Hu
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325000, China
| | - Stephan Barcikowki
- Technical Chemistry and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, 47057, Duisburg, Germany
| | - Sven Reichenberger
- Technical Chemistry and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, 47057, Duisburg, Germany
| | - Alexander Eychmüller
- Physical Chemistry, Technische Universität Dresden, Bergstr. 66b, 01069, Dresden, Germany
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23
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Hierarchical microfibrillar gels from evaporation-induced anisotropic self-assembly of in situ-generated nanocrystals. J Colloid Interface Sci 2020; 558:78-84. [PMID: 31585224 DOI: 10.1016/j.jcis.2019.09.110] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2019] [Revised: 09/26/2019] [Accepted: 09/27/2019] [Indexed: 12/17/2022]
Abstract
Whilst nanocrystal gels may be formed via destabilization of pre-functionalized nanocrystal dispersions, gelation via assembly of unfunctionalized nanocrystals into fibrillar networks remains a significant challenge. Here, we show that gels with hierarchical microfibrillar networks are formed from anisotropic self-assembly of in situ-generated mesolamellar nanocrystals upon evaporation of ZnO nanofluids. The obtained gels display the thermo-reversible behavior characteristic of a non-covalent physical gel. We elucidate a three-stage gelation mechanism. In the pre-nucleation stage, the cloudy ZnO nanofluid transforms into a transparent stable suspension, comprising multi-branched networks of aggregates self-assembled from in situ-generated layered zinc hydroxide (LZH) nanocrystals upon solvent evaporation. In the subsequent nucleation and anisotropic 1D fibre growth stage, further evaporation triggers nucleation and growth of 1D nanofibers through reorganization of the nanocrystal aggregates, before rapid nanofibre bundling leading to microfibrillar networks in the ultimate gelation stage. Our results provide mechanistic insights for hierarchical self-assembly of nanocrystals into fibrillar gels and open up facile fabrication routes using reactive transition metal-oxide nanofluids for new functional fibres and gels.
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24
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Yang J, Li Y, Zheng Y, Xu Y, Zheng Z, Chen X, Liu W. Versatile Aerogels for Sensors. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1902826. [PMID: 31475442 DOI: 10.1002/smll.201902826] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 08/02/2019] [Indexed: 05/27/2023]
Abstract
Aerogels are unique solid-state materials composed of interconnected 3D solid networks and a large number of air-filled pores. They extend the structural characteristics as well as physicochemical properties of nanoscale building blocks to macroscale, and integrate typical characteristics of aerogels, such as high porosity, large surface area, and low density, with specific properties of the various constituents. These features endow aerogels with high sensitivity, high selectivity, and fast response and recovery for sensing materials in sensors such as gas sensors, biosensors and strain and pressure sensors, among others. Considerable research efforts in recent years have been devoted to the development of aerogel-based sensors and encouraging accomplishments have been achieved. Herein, groundbreaking advances in the preparation, classification, and physicochemical properties of aerogels and their sensing applications are presented. Moreover, the current challenges and some perspectives for the development of high-performance aerogel-based sensors are summarized.
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Affiliation(s)
- Jing Yang
- The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, P. R. China
| | - Yi Li
- The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, P. R. China
| | - Yuanyuan Zheng
- The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, P. R. China
| | - Yingming Xu
- Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080, P. R. China
| | - Zhikun Zheng
- Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Guangdong Engineering Technology Research Center for High-performance Organic and Polymer Photoelectric Functional Films, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, P. R. China
| | - Xudong Chen
- Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Guangdong Engineering Technology Research Center for High-performance Organic and Polymer Photoelectric Functional Films, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, P. R. China
| | - Wei Liu
- The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, P. R. China
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Cai B, Eychmüller A. Promoting Electrocatalysis upon Aerogels. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1804881. [PMID: 30536681 DOI: 10.1002/adma.201804881] [Citation(s) in RCA: 74] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2018] [Revised: 09/20/2018] [Indexed: 05/27/2023]
Abstract
Electrocatalysis plays a prominent role in renewable energy conversion and storage, enabling a number of sustainable processes for future technologies. There are generally three strategies to improve the efficiency (or activity) of the electrocatalysts: i) increasing the intrinsic activity of the catalyst itself, ii) improving the exposure of active sites, and iii) accelerating mass transfer during catalysis (both reactants and products). These strategies are not mutually exclusive and can ideally be addressed simultaneously, leading to the largest improvements in activity. Aerogels, as featured by large surface area, high porosity, and self-supportability, provide a platform that matches all the aforementioned criteria for the design of efficient electrocatalysts. The field of aerogel synthesis has seen much progress in recent years, mainly thanks to the rapid development of nanotechnology. Employing precursors with different properties enables the resulting aerogel with targeted catalytic properties and improved performances. Here, the design strategies of aerogel catalysts are demonstrated, and their performance for several electrochemical reactions is reviewed. The common principles that govern electrocatalysis are further discussed for each category of reactions, thus serving as a guide to the development of future aerogel electrocatalysts.
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Affiliation(s)
- Bin Cai
- Physikalische Chemie, Technische Universität Dresden, Bergstraße 66b, 01062, Dresden, Germany
| | - Alexander Eychmüller
- Physikalische Chemie, Technische Universität Dresden, Bergstraße 66b, 01062, Dresden, Germany
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Wang J, Chen F, Jin Y, Guo L, Gong X, Wang X, Johnston RL. In situ high-potential-driven surface restructuring of ternary AgPd-Pt dilute aerogels with record-high performance improvement for formate oxidation electrocatalysis. NANOSCALE 2019; 11:14174-14185. [PMID: 31210227 DOI: 10.1039/c9nr03266e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Engineering nanoparticle surfaces driven by various gas atmospheres has attracted intensive attention in the design of efficient electrocatalysts for sustainable energy applications. However, the development of a more facile and efficient in situ engineering strategy under electrochemical testing conditions to achieve surface-reconstruction-induced high performance is significantly lacking. Herein, for the first time, we report in situ high-potential-driven restructuring in ternary AgPdPt aerogels with dilute Pt (AgPd-Ptdilute) during the electrochemical cyclic voltammetry testing for the alkaline formate oxidation reaction (FOR), in which the upper potential limit is ingeniously extended to the Ag redox region. Impressively, the resulting AgPd-Ptdilute aerogel displayed remarkable structural and compositional reconstruction in an alkaline environment. Our comprehensive results revealed that the high-potential cycling induces unique Ag outward diffusion to form an enriched PdPt metallic surface atomically coupled with amorphous Ag2O, which provides more opportunities to expose abundant active sites and induce robust electronic structure modulation. Notably, the surface-restructured AgPd-Ptdilute aerogel achieved record-high activity for FOR when the upper potential limit was extended to 1.3 V, exhibiting an unprecedented 5-fold improvement in activity compared to that of the commercial Pd/C. Moreover, it also offered greatly enhanced electrochemical stability with negligible activity decay after 500 cycles. This work gives a good understanding of surface reconstruction during such a novel high-potential-driven cycling process and opens a new door to designing more efficient electrocatalysts for FOR and beyond.
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Affiliation(s)
- Jiali Wang
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, 710072, China.
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Du R, Hu Y, Hübner R, Joswig JO, Fan X, Schneider K, Eychmüller A. Specific ion effects directed noble metal aerogels: Versatile manipulation for electrocatalysis and beyond. SCIENCE ADVANCES 2019; 5:eaaw4590. [PMID: 31139750 PMCID: PMC6534393 DOI: 10.1126/sciadv.aaw4590] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Accepted: 04/15/2019] [Indexed: 05/11/2023]
Abstract
Noble metal foams (NMFs) are a new class of functional materials featuring properties of both noble metals and monolithic porous materials, providing impressive prospects in diverse fields. Among reported synthetic methods, the sol-gel approach manifests overwhelming advantages for versatile synthesis of nanostructured NMFs (i.e., noble metal aerogels) under mild conditions. However, limited gelation methods and elusive formation mechanisms retard structure/composition manipulation, hampering on-demand design for practical applications. Here, highly tunable NMFs are fabricated by activating specific ion effects, enabling various single/alloy aerogels with adjustable composition (Au, Ag, Pd, and Pt), ligament sizes (3.1 to 142.0 nm), and special morphologies. Their superior performance in programmable self-propulsion devices and electrocatalytic alcohol oxidation is also demonstrated. This study provides a conceptually new approach to fabricate and manipulate NMFs and an overall framework for understanding the gelation mechanism, paving the way for on-target design of NMFs and investigating structure-performance relationships for versatile applications.
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Affiliation(s)
- Ran Du
- Physical Chemistry, Technische Universität Dresden, Bergstr. 66b, 01062 Dresden, Germany
| | - Yue Hu
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325000, China
- Corresponding author. (A.E.); (Y.H.)
| | - René Hübner
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstrasse 400, 01328 Dresden, Germany
| | - Jan-Ole Joswig
- Theoretische Chemie, Fakultät für Chemie und Lebensmittelchemie, Technische Universität Dresden, 01062 Dresden, Germany
| | - Xuelin Fan
- Physical Chemistry, Technische Universität Dresden, Bergstr. 66b, 01062 Dresden, Germany
| | - Kristian Schneider
- Physical Chemistry, Technische Universität Dresden, Bergstr. 66b, 01062 Dresden, Germany
| | - Alexander Eychmüller
- Physical Chemistry, Technische Universität Dresden, Bergstr. 66b, 01062 Dresden, Germany
- Corresponding author. (A.E.); (Y.H.)
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Huang X, Zhou H, Huang Y, Jiang H, Yang N, Shahzad SA, Meng L, Yu C. Silver nanoparticles decorated and tetraphenylethene probe doped silica nanoparticles: A colorimetric and fluorometric sensor for sensitive and selective detection and intracellular imaging of hydrogen peroxide. Biosens Bioelectron 2018; 121:236-242. [DOI: 10.1016/j.bios.2018.09.023] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 08/29/2018] [Accepted: 09/06/2018] [Indexed: 01/26/2023]
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Cai B, Sayevich V, Gaponik N, Eychmüller A. Emerging Hierarchical Aerogels: Self-Assembly of Metal and Semiconductor Nanocrystals. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1707518. [PMID: 29921028 DOI: 10.1002/adma.201707518] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2017] [Revised: 02/14/2018] [Indexed: 06/08/2023]
Abstract
Aerogels assembled from colloidal metal or semiconductor nanocrystals (NCs) feature large surface area, ultralow density, and high porosity, thus rendering them attractive in various applications, such as catalysis, sensors, energy storage, and electronic devices. Morphological and structural modification of the aerogel backbones while maintaining the aerogel properties enables a second stage of the aerogel research, which is defined as hierarchical aerogels. Different from the conventional aerogels with nanowire-like backbones, those hierarchical aerogels are generally comprised of at least two levels of architectures, i.e., an interconnected porous structure on the macroscale and a specially designed configuration at local backbones at the nanoscale. This combination "locks in" the inherent properties of the NCs, so that the beneficial genes obtained by nanoengineering are retained in the resulting monolithic hierarchical aerogels. Herein, groundbreaking advances in the design, synthesis, and physicochemical properties of the hierarchical aerogels are reviewed and organized in three sections: i) pure metallic hierarchical aerogels, ii) semiconductor hierarchical aerogels, and iii) metal/semiconductor hybrid hierarchical aerogels. This report aims to define and demonstrate the concept, potential, and challenges of the hierarchical aerogels, thereby providing a perspective on the further development of these materials.
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Affiliation(s)
- Bin Cai
- Physical Chemistry and Center for Advancing Electronics Dresden (cfAED), Technische Universität Dresden, Bergstraße 66b, 01062, Dresden, Germany
| | - Vladimir Sayevich
- Physical Chemistry and Center for Advancing Electronics Dresden (cfAED), Technische Universität Dresden, Bergstraße 66b, 01062, Dresden, Germany
| | - Nikolai Gaponik
- Physical Chemistry and Center for Advancing Electronics Dresden (cfAED), Technische Universität Dresden, Bergstraße 66b, 01062, Dresden, Germany
| | - Alexander Eychmüller
- Physical Chemistry and Center for Advancing Electronics Dresden (cfAED), Technische Universität Dresden, Bergstraße 66b, 01062, Dresden, Germany
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Wang J, Chen F, Jin Y, Lei Y. Dilute Au-Containing Ag Nanosponges as a Highly Active and Durable Electrocatalyst for Oxygen Reduction and Alcohol Oxidation Reactions. ACS APPLIED MATERIALS & INTERFACES 2018; 10:6276-6287. [PMID: 29380590 DOI: 10.1021/acsami.7b17066] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Zero-dimensional nanoparticles (NPs) have been demonstrated as the promising class of catalysts for various chemical and electrochemical reactions. However, the emerging Au-Ag NP catalysts suffer from single functionality, limited activity enhancement, and unsatisfactory stability problems. Here, we report a facile kinetically controlled solution method to prepare a new class of Au-Ag nanoporous sponges (NSs) composed of three-dimensional networks without using additional stabilizing agents at room temperature. The unexpected shift of the d-band center in our Au-Ag NSs was observed for the first time in Au-Ag bimetallic systems, which effectively activates the Au-Ag NSs for electrochemical reactions. The robust electronic effect coupled with abundant accessible active sites from the hierarchically porous architecture make the bare Au-Ag NSs a superior multifunctional catalyst for oxygen reduction, ethylene glycol (EG) oxidation, and glucose oxidation reactions compared to the commercial Pt/C electrocatalyst in alkaline medium. The optimized AuAg3.2 NSs deliver a mass activity of 1.26 A mgAu-1 toward oxygen reduction reaction, which is ∼8.2 times as high as that of the Pt/C electrocatalyst, simultaneously showing outstanding stability with negligible activity decay after 10 000 cycles. For the anodic reactions, these AuAg3.2 NSs show extremely high activity and stability toward both EG and glucose catalytic oxidation reactions with a higher mass activity of 7.58 and 1.48 A mgAu-1, about 3- and 18.5-fold enhancement than Pt/C, respectively. This work provides important insights into the structural design, performance optimization, and cost reduction to promote the practical applications of liquid fuel cells.
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Affiliation(s)
- Jiali Wang
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University , Xi'an 710072, China
| | - Fuyi Chen
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University , Xi'an 710072, China
| | - Yachao Jin
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University , Xi'an 710072, China
| | - Yimin Lei
- School of Advanced Materials and Nanotechnology, Xidian University , Xi'an 710126, China
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31
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Kodanek T, Freytag A, Schlosser A, Naskar S, Härtling T, Dorfs D, Bigall NC. Macroscopic Aerogels with Retained Nanoscopic Plasmonic Properties. ACTA ACUST UNITED AC 2018. [DOI: 10.1515/zpch-2017-1045] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Aerogels can bridge the nanoscopic to the macroscopic world. One physical phenomenon typically limited to the nanoscopic world is the occurrence of localized surface plasmon resonances (LSPRs), which are observed in conductive nanoparticles. Once brought into close contact, assemblies or superstructures of these nanoparticles often lose their plasmonic properties in the transition stage towards the bulk material. Therefore, LSPRs are typically not observed in macroscopic objects. The present work aims at voluminous nanoparticle-based aerogels with optical properties close to that of the initial colloidal solution and the possibility to manipulate the final plasmonic properties by bringing the particles into defined distances. In detail, Ag nanocrystals with silica shells ranging from 0 to 12 nm are employed as building blocks, which are assembled from their solution into macroscopic three-dimensional superstructures by freezing and subsequent lyophilization. These cryogelated aerogels are synthesized as monoliths and thin films in which the Ag nanocrystals are arranged in defined distances according to their silica shell. The resulting aerogels exhibit plasmonic properties ranging from a behavior similar to that of the building blocks for the thickest shell to a heavily distorted behavior for bare Ag nanocrystals.
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Affiliation(s)
- Torben Kodanek
- Institute of Physical Chemistry and Electrochemistry (PCI) , Leibniz Universität Hannover , Callinstraße 3A , 30167 Hannover , Germany
- Laboratory for Nano and Quantum Engineering (LNQE) , Leibniz Universität Hannover , Schneiderberg 39 , 30167 Hannover , Germany
| | - Axel Freytag
- Institute of Physical Chemistry and Electrochemistry (PCI) , Leibniz Universität Hannover , Callinstraße 3A , 30167 Hannover , Germany
- Laboratory for Nano and Quantum Engineering (LNQE) , Leibniz Universität Hannover , Schneiderberg 39 , 30167 Hannover , Germany
| | - Anja Schlosser
- Institute of Physical Chemistry and Electrochemistry (PCI) , Leibniz Universität Hannover , Callinstraße 3A , 30167 Hannover , Germany
- Laboratory for Nano and Quantum Engineering (LNQE) , Leibniz Universität Hannover , Schneiderberg 39 , 30167 Hannover , Germany
| | - Suraj Naskar
- Institute of Physical Chemistry and Electrochemistry (PCI) , Leibniz Universität Hannover , Callinstraße 3A , 30167 Hannover , Germany
- Laboratory for Nano and Quantum Engineering (LNQE) , Leibniz Universität Hannover , Schneiderberg 39 , 30167 Hannover , Germany
| | - Thomas Härtling
- Fraunhofer Institute for Ceramic Technologies and Systems IKTS , Maria-Reiche-Str. 2 , 01109 Dresden , Germany
| | - Dirk Dorfs
- Institute of Physical Chemistry and Electrochemistry (PCI) , Leibniz Universität Hannover , Callinstraße 3A , 30167 Hannover , Germany
- Laboratory for Nano and Quantum Engineering (LNQE) , Leibniz Universität Hannover , Schneiderberg 39 , 30167 Hannover , Germany
| | - Nadja Carola Bigall
- Institute of Physical Chemistry and Electrochemistry (PCI) , Leibniz Universität Hannover , Callinstraße 3A , 30167 Hannover , Germany
- Laboratory for Nano and Quantum Engineering (LNQE) , Leibniz Universität Hannover , Schneiderberg 39 , 30167 Hannover , Germany
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32
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Jiang S, Agarwal S, Greiner A. Offenzellige Schwämme mit niedrigen Dichten als Funktionsmaterialien. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201700684] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Shaohua Jiang
- Makromolekulare Chemie II, Bayerisches Polymerinstitut; Universität Bayreuth; Universitätsstraße 30 95440 Bayreuth Deutschland
- College of Materials Science and Engineering; Nanjing Forestry University; Nanjing 210037 China
| | - Seema Agarwal
- Makromolekulare Chemie II, Bayerisches Polymerinstitut; Universität Bayreuth; Universitätsstraße 30 95440 Bayreuth Deutschland
| | - Andreas Greiner
- Makromolekulare Chemie II, Bayerisches Polymerinstitut; Universität Bayreuth; Universitätsstraße 30 95440 Bayreuth Deutschland
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Abstract
Low-density macroporous sponges with densities less than 100 mg cm-3 are both a challenge and an opportunity for advanced chemistry and material science. The challenge lies in the precise preparation of the sponges with property combinations that lead to novel applications. Bottom-up and top-down chemical and engineering methods for the preparation of sponges are a major focus of this Review, with an emphasis on carbon and polymer materials. The light weight, sustainability, breathability, special wetting characteristics, large mass transfer, mechanical stability, and large pore volume are typical characteristics of sponges made of advanced materials and could lead to novel applications. Some selected sponge properties and potential applications are discussed.
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Affiliation(s)
- Shaohua Jiang
- Macromolecular Chemistry II, Department of Chemistry, Bavarian Polymer Institute, University of Bayreuth, Universitätsstrasse 30, 95440, Bayreuth, Germany.,College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037, China
| | - Seema Agarwal
- Macromolecular Chemistry II, Department of Chemistry, Bavarian Polymer Institute, University of Bayreuth, Universitätsstrasse 30, 95440, Bayreuth, Germany
| | - Andreas Greiner
- Macromolecular Chemistry II, Department of Chemistry, Bavarian Polymer Institute, University of Bayreuth, Universitätsstrasse 30, 95440, Bayreuth, Germany
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34
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Huang X, Shahzad SA, Li Y, Zhang Y, Sang L, Zhou H, Jiang H, Kam-Wing Lo K, Yu C. Silver nanoclusters capped silica nanoparticles as a ratiometric photoluminescence nanosensor for the selective detection of I− and S2−. Anal Chim Acta 2017; 988:74-80. [DOI: 10.1016/j.aca.2017.07.056] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Revised: 07/14/2017] [Accepted: 07/21/2017] [Indexed: 11/17/2022]
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35
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Ziegler C, Wolf A, Liu W, Herrmann AK, Gaponik N, Eychmüller A. Moderne Anorganische Aerogele. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611552] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Christoph Ziegler
- Physical Chemistry; Technische Universität Dresden; Bergstraße 66b 01062 Dresden Deutschland
- LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays School of Physical and Mathematical Sciences; Nanyang Technological University; Singapore 639798 Singapur
| | - André Wolf
- Physical Chemistry; Technische Universität Dresden; Bergstraße 66b 01062 Dresden Deutschland
| | - Wei Liu
- Physical Chemistry; Technische Universität Dresden; Bergstraße 66b 01062 Dresden Deutschland
| | - Anne-Kristin Herrmann
- Physical Chemistry; Technische Universität Dresden; Bergstraße 66b 01062 Dresden Deutschland
| | - Nikolai Gaponik
- Physical Chemistry; Technische Universität Dresden; Bergstraße 66b 01062 Dresden Deutschland
| | - Alexander Eychmüller
- Physical Chemistry; Technische Universität Dresden; Bergstraße 66b 01062 Dresden Deutschland
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36
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Ziegler C, Wolf A, Liu W, Herrmann AK, Gaponik N, Eychmüller A. Modern Inorganic Aerogels. Angew Chem Int Ed Engl 2017; 56:13200-13221. [DOI: 10.1002/anie.201611552] [Citation(s) in RCA: 221] [Impact Index Per Article: 31.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2016] [Indexed: 12/17/2022]
Affiliation(s)
- Christoph Ziegler
- Physical Chemistry; Technische Universität Dresden; Bergstrasse 66b 01062 Dresden Germany
- Present address: LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays School of Physical and Mathematical Sciences; Nanyang Technological University; Singapore 639798 Singapore
| | - André Wolf
- Physical Chemistry; Technische Universität Dresden; Bergstrasse 66b 01062 Dresden Germany
| | - Wei Liu
- Physical Chemistry; Technische Universität Dresden; Bergstrasse 66b 01062 Dresden Germany
| | - Anne-Kristin Herrmann
- Physical Chemistry; Technische Universität Dresden; Bergstrasse 66b 01062 Dresden Germany
| | - Nikolai Gaponik
- Physical Chemistry; Technische Universität Dresden; Bergstrasse 66b 01062 Dresden Germany
| | - Alexander Eychmüller
- Physical Chemistry; Technische Universität Dresden; Bergstrasse 66b 01062 Dresden Germany
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37
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Kado S, Yokomine S, Kimura K. Widely Tunable Plasmon Resonances from Visible to Near-Infrared of Hollow Silver Nanoshells. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2017. [DOI: 10.1246/bcsj.20160389] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Shinpei Kado
- Department of Applied Chemistry, Faculty of Systems Engineering, Wakayama University, Sakae-dani 930, Wakayama 640-8510
| | - Shoichi Yokomine
- Department of Applied Chemistry, Faculty of Systems Engineering, Wakayama University, Sakae-dani 930, Wakayama 640-8510
| | - Keiichi Kimura
- Department of Applied Chemistry, Faculty of Systems Engineering, Wakayama University, Sakae-dani 930, Wakayama 640-8510
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38
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Jiang J, Soo Lim Y, Park S, Kim SH, Yoon S, Piao L. Hollow porous Cu particles from silica-encapsulated Cu 2O nanoparticle aggregates effectively catalyze 4-nitrophenol reduction. NANOSCALE 2017; 9:3873-3880. [PMID: 28256659 DOI: 10.1039/c6nr09934c] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A hollow metal micro/nanomaterial with a porous wall is one of the most attractive structures for catalysts. The synthesis of hollow porous Cu particles remains a challenge due to their air-sensitive characteristics. In this study, we report a facile and scalable method for the preparation of high-quality hollow porous Cu particles in the range of 500 nm-1.5 μm with a well-defined structure from Cu2O nanoparticle aggregates (NPAs). The synthetic procedure involves the silica-encapsulation and depth-controlled reduction of Cu2O NPAs followed by heat-treatment in air and selective removal of the encapsulating layer. The catalytic performance of the hollow porous Cu particles was evaluated through the catalytic reduction of 4-nitrophenol with NaBH4 as a model reaction. The hollow porous Cu particles exhibited a high activity factor, K = 186 s-1 g-1, which is the highest K value obtained among the unsupported Cu catalysts to date. And the K value is better than that of some noble metal catalysts, such as Au, Ag, and Pd. In addition, the catalyst could be easily separated from the reaction system and still possessed high activity as well as stability in recycled reactions.
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Affiliation(s)
- Jianwei Jiang
- Department of Bio & Nano Chemistry, Kookmin University, 861-1, Jeongneung-dong, Seongbuk-gu, Seoul 136-702, Korea.
| | - Young Soo Lim
- Department of Materials System Engineering, Pukyong National University, 365 Sinseon-ro, Nam-gu, Busan 48547, Korea
| | - Sanghyuk Park
- Department of Chemistry, Kongju National University, Chungnam 314-701, Korea.
| | - Sang-Ho Kim
- Department of Chemistry, Kongju National University, Chungnam 314-701, Korea.
| | - Sungho Yoon
- Department of Bio & Nano Chemistry, Kookmin University, 861-1, Jeongneung-dong, Seongbuk-gu, Seoul 136-702, Korea.
| | - Longhai Piao
- Department of Chemistry, Kongju National University, Chungnam 314-701, Korea.
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Wen D, Eychmüller A. 3D assembly of preformed colloidal nanoparticles into gels and aerogels: function-led design. Chem Commun (Camb) 2017; 53:12608-12621. [DOI: 10.1039/c7cc03862c] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Nanoparticle-based aerogels combine the properties of traditional aerogels with those of nanoparticles, and hold promise for various applications following a function-led design.
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Affiliation(s)
- Dan Wen
- Center for Nano Energy Materials
- School of Materials Science and Engineering
- Northwestern Polytechnical University
- Xi’an 710072
- China
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40
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Rechberger F, Niederberger M. Synthesis of aerogels: from molecular routes to 3-dimensional nanoparticle assembly. NANOSCALE HORIZONS 2017; 2:6-30. [PMID: 32260673 DOI: 10.1039/c6nh00077k] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Colloidal nanocrystals are extensively used as building blocks in nanoscience, and amazing results have been achieved in assembling them into ordered, close-packed structures. But in spite of great efforts, the size of these structures is typically restricted to a few micrometers, and it is very hard to extend them into the macroscopic world. In comparison, aerogels are macroscopic materials, highly porous, disordered, ultralight and with immense surface areas. With these distinctive characteristics, they are entirely contrary to common nanoparticle assemblies such as superlattices or nanocrystal solids, and therefore cover a different range of applications. While aerogels are traditionally synthesized by molecular routes based on aqueous sol-gel chemistry, in the last few years the gelation of nanoparticle dispersions became a viable alternative to improve the crystallinity and to widen the structural, morphological and compositional complexity of aerogels. In this Review, the different approaches to inorganic non-siliceous and non-carbon aerogels are addressed. We start our discussion with wet chemical routes involving molecular precursors, followed by processing methods using nanoparticles as building blocks. A unique feature of many of these routes is the fact that a macroscopic, often monolithic body is produced by pure self-assembly of nanosized colloids without the need for any templates.
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Affiliation(s)
- Felix Rechberger
- Laboratory for Multifunctional Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, CH-8093 Zurich, Switzerland.
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41
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Zhu C, Shi Q, Fu S, Song J, Xia H, Du D, Lin Y. Efficient Synthesis of MCu (M = Pd, Pt, and Au) Aerogels with Accelerated Gelation Kinetics and their High Electrocatalytic Activity. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:8779-8783. [PMID: 27546519 DOI: 10.1002/adma.201602546] [Citation(s) in RCA: 106] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 07/20/2016] [Indexed: 05/03/2023]
Abstract
To accelerate hydrogel formation and further simplify the synthetic procedure, a series of MCu (M = Pd, Pt, and Au) bimetallic aerogels is synthesized from the in situ reduction of metal precursors through enhancement of the gelation kinetics at elevated temperature. Moreover, the resultant PdCu aerogel with ultrathin nanowire networks exhibits excellent electrocatalytic performance toward ethanol oxidation, holding promise in fuel-cell applications.
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Affiliation(s)
- Chengzhou Zhu
- School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, 99164, USA
| | - Qiurong Shi
- School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, 99164, USA
| | - Shaofang Fu
- School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, 99164, USA
| | - Junhua Song
- School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, 99164, USA
| | - Haibing Xia
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China
| | - Dan Du
- School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, 99164, USA
| | - Yuehe Lin
- School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, 99164, USA.
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Gao X, Esteves RJA, Nahar L, Nowaczyk J, Arachchige IU. Direct Cross-Linking of Au/Ag Alloy Nanoparticles into Monolithic Aerogels for Application in Surface-Enhanced Raman Scattering. ACS APPLIED MATERIALS & INTERFACES 2016; 8:13076-85. [PMID: 27142886 DOI: 10.1021/acsami.5b11582] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The direct cross-linking of Au/Ag alloy nanoparticles (NPs) into high surface area, mesoporous Au/Ag aerogels via chemical oxidation of the surface ligands is reported. The precursor alloy NPs with composition-tunable morphologies were produced by galvanic replacement of the preformed Ag hollow NPs. The effect of Au:Ag molar ratio on the NP morphology and surface plasmon resonance has been thoroughly investigated and resulted in smaller Au/Ag alloy NPs (4-8 nm), larger Au/Ag alloy hollow NPs (40-45 nm), and Au/Ag alloy hollow particles decorated with smaller Au NPs (2-5 nm). The oxidative removal of surfactant ligands, followed by supercritical drying, is utilized to construct large (centimeter to millimeter) self-supported Au/Ag alloy aerogels. The resultant assemblies exhibit high surface areas (67-73 m(2)/g), extremely low densities (0.051-0.055 g/cm(3)), and interconnected mesoporous (2-50 nm) networks, making them of great interest for a number of new technologies. The influence of mesoporous gel morphology on surface-enhanced Raman scattering (SERS) has been studied using Rhodamine 101 (Rd 101) as the probe molecule. The alloy aerogels exhibit SERS signal intensities that are 10-42 times higher than those achieved from the precursor Au/Ag alloy NPs. The Au/Ag alloy aerogel III exhibits SERS sensing capability down to 1 nM level. The increased signal intensities attained for alloy aerogels are attributed to highly porous gel morphology and enhanced surface roughness that can potentially generate a large number of plasmonic hot spots, creating efficient SERS substrates for future applications.
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Affiliation(s)
- Xiaonan Gao
- Department of Chemistry, Virginia Commonwealth University , Richmond, Virginia 23284-2006, United States
| | - Richard J Alan Esteves
- Department of Chemistry, Virginia Commonwealth University , Richmond, Virginia 23284-2006, United States
| | - Lamia Nahar
- Department of Chemistry, Virginia Commonwealth University , Richmond, Virginia 23284-2006, United States
| | - Jordan Nowaczyk
- Department of Chemistry, Virginia Commonwealth University , Richmond, Virginia 23284-2006, United States
| | - Indika U Arachchige
- Department of Chemistry, Virginia Commonwealth University , Richmond, Virginia 23284-2006, United States
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Liu Z, Xu K, She P, Yin S, Zhu X, Sun H. Self-assembly of 2D MnO 2 nanosheets into high-purity aerogels with ultralow density. Chem Sci 2016; 7:1926-1932. [PMID: 29899917 PMCID: PMC5966798 DOI: 10.1039/c5sc03217b] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Accepted: 11/26/2015] [Indexed: 01/12/2023] Open
Abstract
Self-assembling inorganic nanoparticles (NPs) into macroscopic three dimensional (3D) architectures often requires the assistance of organic components, leaving residual organics in the resultant. In this work, organic-free MnO2 aerogels with ultralow density have been achieved by the self-assembly of two dimensional (2D) MnO2 nanosheets via an ice-templating approach. To the authors' best knowledge, it is the first reported case of constructing a high-purity inorganic aerogel from preformed NPs without using any functionalization or stabilization agents. Moreover, it has been demonstrated that an ultralight MnO2 aerogel with a density as low as ∼0.53 mg cm-3, which is the lightest metal oxide aerogel to date, can be well obtained by such an approach. The successful formation of the aerogel can be attributed to the enhanced van der Waals force between the 2D building blocks that have been more orderly arranged by the squeezing of ice crystals during the freezing process. Hence, this work shows a pioneering example of assembling inorganic NPs into aerogels relying only on the weak interactions between NPs (e.g. van der Waals forces). It has also been demonstrated that the obtained MnO2 aerogel can function as an effective absorbent for toxic reducing gas, owing to its strong oxidation ability and high porosity. The strategy presented herein holds good potential to be applied to the fabrication of other high-purity inorganic aerogels, especially those with 2D building blocks readily available.
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Affiliation(s)
- Zhenning Liu
- Key Laboratory of Bionic Engineering (Ministry of Education) , College of Biological and Agricultural Engineering , Jilin University , Changchun , Jilin 130022 , P. R. China .
| | - Kongliang Xu
- Key Laboratory of Bionic Engineering (Ministry of Education) , College of Biological and Agricultural Engineering , Jilin University , Changchun , Jilin 130022 , P. R. China .
| | - Ping She
- Key Laboratory of Bionic Engineering (Ministry of Education) , College of Biological and Agricultural Engineering , Jilin University , Changchun , Jilin 130022 , P. R. China .
| | - Shengyan Yin
- State Key Laboratory on Integrated Optoelectronics , College of Electronic Science and Engineering , Jilin University , Changchun , Jilin 130012 , P. R. China
| | - Xuedong Zhu
- Key Laboratory of Bionic Engineering (Ministry of Education) , College of Biological and Agricultural Engineering , Jilin University , Changchun , Jilin 130022 , P. R. China .
| | - Hang Sun
- Key Laboratory of Bionic Engineering (Ministry of Education) , College of Biological and Agricultural Engineering , Jilin University , Changchun , Jilin 130022 , P. R. China .
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44
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Wen D, Liu W, Haubold D, Zhu C, Oschatz M, Holzschuh M, Wolf A, Simon F, Kaskel S, Eychmüller A. Gold Aerogels: Three-Dimensional Assembly of Nanoparticles and Their Use as Electrocatalytic Interfaces. ACS NANO 2016; 10:2559-67. [PMID: 26751502 PMCID: PMC4768295 DOI: 10.1021/acsnano.5b07505] [Citation(s) in RCA: 96] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 01/11/2016] [Indexed: 05/19/2023]
Abstract
Three-dimensional (3D) porous metal nanostructures have been a long sought-after class of materials due to their collective properties and widespread applications. In this study, we report on a facile and versatile strategy for the formation of Au hydrogel networks involving the dopamine-induced 3D assembly of Au nanoparticles. Following supercritical drying, the resulting Au aerogels exhibit high surface areas and porosity. They are all composed of porous nanowire networks reflecting in their diameters those of the original particles (5-6 nm) via electron microscopy. Furthermore, electrocatalytic tests were carried out in the oxidation of some small molecules with Au aerogels tailored by different functional groups. The beta-cyclodextrin-modified Au aerogel, with a host-guest effect, represents a unique class of porous metal materials of considerable interest and promising applications for electrocatalysis.
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Affiliation(s)
- Dan Wen
- Physical
Chemistry, TU Dresden, Bergstrasse 66b, 01062 Dresden, Germany
| | - Wei Liu
- Physical
Chemistry, TU Dresden, Bergstrasse 66b, 01062 Dresden, Germany
| | - Danny Haubold
- Physical
Chemistry, TU Dresden, Bergstrasse 66b, 01062 Dresden, Germany
| | - Chengzhou Zhu
- Physical
Chemistry, TU Dresden, Bergstrasse 66b, 01062 Dresden, Germany
| | - Martin Oschatz
- Inorganic
Chemistry, TU Dresden, Bergstrasse 66, 01062 Dresden, Germany
| | - Matthias Holzschuh
- Leibniz
Institute of Polymer Research Dresden, Hohe Strasse 6, 01069 Dresden, Germany
| | - André Wolf
- Physical
Chemistry, TU Dresden, Bergstrasse 66b, 01062 Dresden, Germany
| | - Frank Simon
- Leibniz
Institute of Polymer Research Dresden, Hohe Strasse 6, 01069 Dresden, Germany
| | - Stefan Kaskel
- Inorganic
Chemistry, TU Dresden, Bergstrasse 66, 01062 Dresden, Germany
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Du X, Zhou J, Shi J, Xu B. Supramolecular Hydrogelators and Hydrogels: From Soft Matter to Molecular Biomaterials. Chem Rev 2015; 115:13165-307. [PMID: 26646318 PMCID: PMC4936198 DOI: 10.1021/acs.chemrev.5b00299] [Citation(s) in RCA: 1266] [Impact Index Per Article: 140.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2015] [Indexed: 12/19/2022]
Abstract
In this review we intend to provide a relatively comprehensive summary of the work of supramolecular hydrogelators after 2004 and to put emphasis particularly on the applications of supramolecular hydrogels/hydrogelators as molecular biomaterials. After a brief introduction of methods for generating supramolecular hydrogels, we discuss supramolecular hydrogelators on the basis of their categories, such as small organic molecules, coordination complexes, peptides, nucleobases, and saccharides. Following molecular design, we focus on various potential applications of supramolecular hydrogels as molecular biomaterials, classified by their applications in cell cultures, tissue engineering, cell behavior, imaging, and unique applications of hydrogelators. Particularly, we discuss the applications of supramolecular hydrogelators after they form supramolecular assemblies but prior to reaching the critical gelation concentration because this subject is less explored but may hold equally great promise for helping address fundamental questions about the mechanisms or the consequences of the self-assembly of molecules, including low molecular weight ones. Finally, we provide a perspective on supramolecular hydrogelators. We hope that this review will serve as an updated introduction and reference for researchers who are interested in exploring supramolecular hydrogelators as molecular biomaterials for addressing the societal needs at various frontiers.
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Affiliation(s)
- Xuewen Du
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, Massachusetts 02454, United States
| | - Jie Zhou
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, Massachusetts 02454, United States
| | - Junfeng Shi
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, Massachusetts 02454, United States
| | - Bing Xu
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, Massachusetts 02454, United States
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Nahar L, Esteves RJA, Hafiz S, Özgür Ü, Arachchige IU. Metal-Semiconductor Hybrid Aerogels: Evolution of Optoelectronic Properties in a Low-Dimensional CdSe/Ag Nanoparticle Assembly. ACS NANO 2015; 9:9810-9821. [PMID: 26389642 DOI: 10.1021/acsnano.5b02777] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Hybrid nanomaterials composed of metal-semiconductor components exhibit unique properties in comparison to their individual counterparts, making them of great interest for optoelectronic applications. Theoretical and experimental studies suggest that interfacial interactions of individual components are of paramount importance to produce hybrid electronic states. The direct cross-linking of nanoparticles (NPs) via controlled removal of the surfactant ligands provides a route to tune interfacial interactions in a manner that has not been thoroughly investigated. Herein, we report the synthesis of CdSe/Ag heteronanostructures (aerogels) via oxidation induced self-assembly of thiol-coated NPs and the evolution of optical properties as a function of composition. Three hybrid systems were investigated, where the first and second excitonic energies of CdSe were matched with plasmonic energy of Au or Ag NPs and Ag hollow NPs. Physical characterization of the aerogels suggests the presence of an interconnected network of hexagonal CdSe and cubic Ag NPs. The optical properties of hybrids were systematically examined through UV-vis, photoluminescence (PL), and time-resolved (TR) PL spectroscopic studies that indicate the generation of alternate radiative decay pathways. A new emission (640 nm) from CdSe/Ag aerogels emerged at Ag loading as low as 0.27%, whereas absorption band tailing and PL quenching effects were observed at higher Ag and Au loading, respectively. The TRPL decay time of the new emission (∼600 ns) is markedly different from those of the band-edge (1.83 ± 0.03 ns) and trap-state (1190 ± 120 ns) emission maxima of phase pure CdSe, supporting the existence of alternate radiative relaxation pathways in sol-gel derived CdSe/Ag hybrids.
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Affiliation(s)
- Lamia Nahar
- Department of Chemistry, Virginia Commonwealth University , Richmond, Virginia 23284-2006, United States
| | - Richard J Alan Esteves
- Department of Chemistry, Virginia Commonwealth University , Richmond, Virginia 23284-2006, United States
| | - Shopan Hafiz
- Department of Electrical and Computer Engineering, Virginia Commonwealth University , Richmond, Virginia 23284-3072, United States
| | - Ümit Özgür
- Department of Electrical and Computer Engineering, Virginia Commonwealth University , Richmond, Virginia 23284-3072, United States
| | - Indika U Arachchige
- Department of Chemistry, Virginia Commonwealth University , Richmond, Virginia 23284-2006, United States
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Singh A, Lindquist BA, Ong GK, Jadrich RB, Singh A, Ha H, Ellison CJ, Truskett TM, Milliron DJ. Linking Semiconductor Nanocrystals into Gel Networks through All‐Inorganic Bridges. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201508641] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Amita Singh
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA)
| | - Beth A. Lindquist
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA)
| | - Gary K. Ong
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA)
- Department of Materials Science and Engineering, University of California Berkeley, Berkeley, California 94720 (USA)
| | - Ryan B. Jadrich
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA)
| | - Ajay Singh
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA)
| | - Heonjoo Ha
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA)
| | - Christopher J. Ellison
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA)
| | - Thomas M. Truskett
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA)
| | - Delia J. Milliron
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA)
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48
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Singh A, Lindquist BA, Ong GK, Jadrich RB, Singh A, Ha H, Ellison CJ, Truskett TM, Milliron DJ. Linking Semiconductor Nanocrystals into Gel Networks through All‐Inorganic Bridges. Angew Chem Int Ed Engl 2015; 54:14840-4. [DOI: 10.1002/anie.201508641] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Amita Singh
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA)
| | - Beth A. Lindquist
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA)
| | - Gary K. Ong
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA)
- Department of Materials Science and Engineering, University of California Berkeley, Berkeley, California 94720 (USA)
| | - Ryan B. Jadrich
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA)
| | - Ajay Singh
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA)
| | - Heonjoo Ha
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA)
| | - Christopher J. Ellison
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA)
| | - Thomas M. Truskett
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA)
| | - Delia J. Milliron
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, 78712 (USA)
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49
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Cai B, Wen D, Liu W, Herrmann A, Benad A, Eychmüller A. Function‐Led Design of Aerogels: Self‐Assembly of Alloyed PdNi Hollow Nanospheres for Efficient Electrocatalysis. Angew Chem Int Ed Engl 2015; 54:13101-5. [DOI: 10.1002/anie.201505307] [Citation(s) in RCA: 148] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Revised: 07/10/2015] [Indexed: 11/07/2022]
Affiliation(s)
- Bin Cai
- Physikalische Chemie, TU Dresden, Bergstrasse 66b, 01062 Dresden (Germany) http://www.chm.tu‐dresden.de/pc2/
| | - Dan Wen
- Physikalische Chemie, TU Dresden, Bergstrasse 66b, 01062 Dresden (Germany) http://www.chm.tu‐dresden.de/pc2/
| | - Wei Liu
- Physikalische Chemie, TU Dresden, Bergstrasse 66b, 01062 Dresden (Germany) http://www.chm.tu‐dresden.de/pc2/
| | - Anne‐Kristin Herrmann
- Physikalische Chemie, TU Dresden, Bergstrasse 66b, 01062 Dresden (Germany) http://www.chm.tu‐dresden.de/pc2/
| | - Albrecht Benad
- Physikalische Chemie, TU Dresden, Bergstrasse 66b, 01062 Dresden (Germany) http://www.chm.tu‐dresden.de/pc2/
| | - Alexander Eychmüller
- Physikalische Chemie, TU Dresden, Bergstrasse 66b, 01062 Dresden (Germany) http://www.chm.tu‐dresden.de/pc2/
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50
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Cai B, Wen D, Liu W, Herrmann AK, Benad A, Eychmüller A. Funktionsorientiertes Design von Aerogelen: Selbstanordnung von legierten PdNi-Hohlnanosphären als effiziente Elektrokatalysatoren. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201505307] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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