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Zhu L, Zhao Y, Zhai T, Yan Y, Jiang Y, Zhang H, Zhang R, Gan Y, Zhang P, Zhou K, Wu S, Tian C, Jiang N, Liu P. Laser Irradiation Induced Electronic Structure Modulation of the Palladium-Based Nanosheets for Efficient Electrocatalysts. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2405107. [PMID: 39300865 DOI: 10.1002/smll.202405107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2024] [Revised: 08/23/2024] [Indexed: 09/22/2024]
Abstract
Palladium nanosheets (Pd NSs) are widely used as electrocatalysts due to their high atomic utilization efficiency, and long-term stability. Here, the electronic structure modulation of the Pd NSs is realized by a femtosecond laser irradiation strategy. Experimental results indicate that laser irradiation induces the variation in the atomic structures and the macrostrain effects in the Pd NSs. The electronic structure of Pd NSs is modulated by laser irradiation through the balancing between Au-Pd charge transfer and the macros-strain effects. Finite element analysis (FEA) indicates that the lattice of the nanostructures undergoes fast heating and cooling during laser irradiation. The structural evolution mechanism is disclosed by a combined FEA and molecule dynamics (MD) simulation. These results coincide well with the experimental results. The L-AuPd NSs exhibit excellent mass activity and specific activity of 7.44 A mg-1 Pd and 18.70 mA cm-2 toward ethanol oxidation reaction (EOR), 4.3 and 4.4 times higher than the commercial Pd/C. The 2500-cycle accelerated durability (ADT) test confirms the outstanding catalytic stability of the L-AuPd NSs. Density functional theory (DFT) calculations reveal the catalytic mechanism. This unique strategy provides a new pathway to design the ultrathin nanosheet-based materials with excellent performance.
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Affiliation(s)
- Liye Zhu
- School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing, 100124, P. R. China
- Key Laboratory of Trans-scale Laser Manufacturing Technology, Ministry of Education, Beijing, 100124, P. R. China
- Beijing Engineering Research Center of Laser Technology, Beijing University of Technology, Beijing, 100124, P. R. China
- Institute of Matter Science, Beijing University of Technology, Beijing, 100124, P. R. China
| | - Yan Zhao
- School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing, 100124, P. R. China
- Key Laboratory of Trans-scale Laser Manufacturing Technology, Ministry of Education, Beijing, 100124, P. R. China
- Beijing Engineering Research Center of Laser Technology, Beijing University of Technology, Beijing, 100124, P. R. China
- Institute of Matter Science, Beijing University of Technology, Beijing, 100124, P. R. China
| | - Tianrui Zhai
- School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing, 100124, P. R. China
- Key Laboratory of Trans-scale Laser Manufacturing Technology, Ministry of Education, Beijing, 100124, P. R. China
- Beijing Engineering Research Center of Laser Technology, Beijing University of Technology, Beijing, 100124, P. R. China
- Institute of Matter Science, Beijing University of Technology, Beijing, 100124, P. R. China
| | - Yinzhou Yan
- School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing, 100124, P. R. China
- Key Laboratory of Trans-scale Laser Manufacturing Technology, Ministry of Education, Beijing, 100124, P. R. China
- Beijing Engineering Research Center of Laser Technology, Beijing University of Technology, Beijing, 100124, P. R. China
- Institute of Matter Science, Beijing University of Technology, Beijing, 100124, P. R. China
| | - Yijian Jiang
- School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing, 100124, P. R. China
- Key Laboratory of Trans-scale Laser Manufacturing Technology, Ministry of Education, Beijing, 100124, P. R. China
- Beijing Engineering Research Center of Laser Technology, Beijing University of Technology, Beijing, 100124, P. R. China
- Institute of Matter Science, Beijing University of Technology, Beijing, 100124, P. R. China
| | - Huanzhen Zhang
- School of Mathematics and Physics, Hebei University of Engineering, Handan, 056000, P. R. China
| | - Ran Zhang
- Research Centre for Laser Extreme Manufacturing, Ningbo Institute of Materials Engineering and Technology, Chinese Academy of Sciences, Ningbo, 315201, P. R. China
| | - Yuqi Gan
- School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing, 100124, P. R. China
- Institute of Matter Science, Beijing University of Technology, Beijing, 100124, P. R. China
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Pengju Zhang
- School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing, 100124, P. R. China
- Key Laboratory of Trans-scale Laser Manufacturing Technology, Ministry of Education, Beijing, 100124, P. R. China
- Beijing Engineering Research Center of Laser Technology, Beijing University of Technology, Beijing, 100124, P. R. China
- Institute of Matter Science, Beijing University of Technology, Beijing, 100124, P. R. China
| | - Kailing Zhou
- Key Laboratory of Advanced Functional Materials Education Ministry of China, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, P. R. China
| | - Shengbo Wu
- School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing, 100124, P. R. China
- Key Laboratory of Trans-scale Laser Manufacturing Technology, Ministry of Education, Beijing, 100124, P. R. China
- Beijing Engineering Research Center of Laser Technology, Beijing University of Technology, Beijing, 100124, P. R. China
- Institute of Matter Science, Beijing University of Technology, Beijing, 100124, P. R. China
| | - Chenhe Tian
- School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing, 100124, P. R. China
- Key Laboratory of Trans-scale Laser Manufacturing Technology, Ministry of Education, Beijing, 100124, P. R. China
- Beijing Engineering Research Center of Laser Technology, Beijing University of Technology, Beijing, 100124, P. R. China
- Institute of Matter Science, Beijing University of Technology, Beijing, 100124, P. R. China
| | - Nan Jiang
- School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing, 100124, P. R. China
- Key Laboratory of Trans-scale Laser Manufacturing Technology, Ministry of Education, Beijing, 100124, P. R. China
- Beijing Engineering Research Center of Laser Technology, Beijing University of Technology, Beijing, 100124, P. R. China
- Institute of Matter Science, Beijing University of Technology, Beijing, 100124, P. R. China
| | - Peng Liu
- Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, P. R. China
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Singha T, Tomar S, Chakraborty S, Das S, Satpati B. Improved Alcohol Oxidation through Combined Effects of Tensile Lattice Strain and Twin Defects in Core-Shell Electrocatalysts. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2309736. [PMID: 38459644 DOI: 10.1002/smll.202309736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 02/28/2024] [Indexed: 03/10/2024]
Abstract
The direct alcohol fuel cells (DAFCs) rely on alcohol oxidation reactions (AORs) to produce electricity, which require catalysts with optimized electronic structure to accelerate the sluggish AORs. Herein, an epitaxial growth of Pd layer onto the pentatwinned Au@Ag core-shell nanorods (NRs) is reported to synthesize highly strained Au@AgPd core-shell NRs. The tensile strain in the AgPd shell of the Au@AgPd nanorods (NRs) arises not only from the core-shell lattice mismatch but also from twinning and lattice distortion occurring at the five twinned boundaries present in the structure. Theoretical simulations prove that the presence of tensile strains in the AgPd layer leads to a significant upward shift of the d-band center of the Pd site toward the Fermi level which remarkably changes the adsorption energy of alcohols on the surface. Highly strained Au@AgPd NRs show exceptional mass activities in electrochemical oxidation of biomass-derived alcohols (ethylene glycol, ethanol, and glycerol) reaching up to 18.66, 15.6, and 7.90 A mgpd -1, respectively. These values are 23.3, 23.6, and 23.2 times higher than commercial Pd/C catalysts. This strain engineering strategy set the platform for the design and synthesis of highly efficient and versatile catalysts for the construction of high-performance DAFCs.
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Affiliation(s)
- Tukai Singha
- Surface Physics & Material Science Division, Saha Institute of Nuclear Physics, A CI of Homi Bhabha National Institute, 1/AF Bidhannagar, Kolkata, 700064, India
| | - Shalini Tomar
- Material Theory for Energy Scavenging (MATES) Lab, Harish-Chandra Research Institute (HRI), A CI of Homi Bhabha National Institute, Chhatnag Road, Jhunsi, Prayagraj, 211019, India
| | - Sudip Chakraborty
- Material Theory for Energy Scavenging (MATES) Lab, Harish-Chandra Research Institute (HRI), A CI of Homi Bhabha National Institute, Chhatnag Road, Jhunsi, Prayagraj, 211019, India
| | - Shuvankar Das
- Surface Physics & Material Science Division, Saha Institute of Nuclear Physics, A CI of Homi Bhabha National Institute, 1/AF Bidhannagar, Kolkata, 700064, India
| | - Biswarup Satpati
- Surface Physics & Material Science Division, Saha Institute of Nuclear Physics, A CI of Homi Bhabha National Institute, 1/AF Bidhannagar, Kolkata, 700064, India
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3
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Singha T, Tomar S, Das S, Satpati B. D-Band Engineering in Pd-Based Nanowire Networks for Further Enhancement in Ethanol Electrooxidation Reaction. SMALL METHODS 2024:e2400368. [PMID: 38745535 DOI: 10.1002/smtd.202400368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2024] [Revised: 04/19/2024] [Indexed: 05/16/2024]
Abstract
The development of highly efficient electrocatalysts for the ethanol oxidation reaction (EOR) is essential for the commercialization of direct ethanol fuel cells, yet challenges remain. In this study, a one-pot solution-phase method to synthesize Pd nanowire networks (NNWs) with very high surface-to-volume ratio having numerous twin and grain boundaries is developed. Using the same method, the Pd lattice is further engineered by introducing Ag and Cu atoms to produce AgPd, and CuPd alloy structure which significantly shifts the Pd d-band center upward and downward, respectively due to strain and ligand effects. Theoretical analysis employing density functional theory (DFT) demonstrates that such modification of the d-band center significantly influences the adsorption energies of reactants on the catalytic surface. Owing to their notably high surface-to-volume ratio and the presence of multiple twin and grain boundaries, Pd NNWs demonstrate significantly enhanced electrocatalytic activity toward EOR, ≈7.2 times greater than that of commercial Pd/C. Remarkably, compared to Pd NNWs, AgPd, and CuPd NNWs display enlarged and reduced electrocatalytic activity toward EOR, respectively. Specifically, Ag4Pd7 NNWs achieve a remarkable mass activity of 9.00 A mgpd -1 for EOR, which is 13.6 times higher than commercial Pd/C.
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Affiliation(s)
- Tukai Singha
- Surface Physics & Material Science Division, Saha Institute of Nuclear Physics, A CI of Homi Bhabha National Institute, 1/AF Bidhannagar, Kolkata, 700064, India
| | - Shalini Tomar
- Indo-Korea Science and Technology Center (IKST), Bangalore, 560065, India
| | - Shuvankar Das
- Surface Physics & Material Science Division, Saha Institute of Nuclear Physics, A CI of Homi Bhabha National Institute, 1/AF Bidhannagar, Kolkata, 700064, India
| | - Biswarup Satpati
- Surface Physics & Material Science Division, Saha Institute of Nuclear Physics, A CI of Homi Bhabha National Institute, 1/AF Bidhannagar, Kolkata, 700064, India
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4
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Feng Z, Liu Z, Bai X. Preparation of Ni@Pd Core-Shell Nanoparticles Supported on KIT-6 by Ultrasound-Assisted Galvanic Replacement for Dodecahydro- N-ethylcarbazole Dehydrogenation. Inorg Chem 2023; 62:14355-14367. [PMID: 37616599 DOI: 10.1021/acs.inorgchem.3c02013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/26/2023]
Abstract
Using Ni as a template and reductant, Ni core-Pd shell nanoparticles (Ni@Pd NPs) supported on KIT-6 (Ni@Pd/K6) were prepared by a galvanic replacement reaction under ultrasonic radiation. The characterization results show that the Ni@Pd core-shell NPs with an average diameter of 1.9 ± 0.3 nm are uniformly dispersed on KIT-6. The d-band center position of Pd in Ni@Pd core-shell NPs can be affected by both ligand and strain effects. The relationship between the d-band center of Pd and the selectivity of intermediates is a nearly straight curve. The dehydrogenation efficiency of dodecahydro-N-ethylcarbazole on Ni@Pd(6:1)/K6 is 100% only for 3 h at 180 °C and 95.5% for 6 h at 160 °C, which is better than the reported catalysts. The outstanding catalytic dehydrogenation performance of Ni@Pd(6:1)/K6 can be attributed to the synergistic effect of the ligand and strain effect, the high dispersion of core-shell NPs, and the weak H2 binding ability of the catalyst.
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Affiliation(s)
- Zhaolu Feng
- College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
| | - Ziting Liu
- Institute of Petrochemical, Heilongjiang Academy of Sciences, Harbin 150040, China
| | - Xuefeng Bai
- College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
- School of Chemistry and Material Science, Heilongjiang University, Harbin 150080, China
- Institute of Petrochemical, Heilongjiang Academy of Sciences, Harbin 150040, China
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5
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Perco D, Loi F, Bignardi L, Sbuelz L, Lacovig P, Tosi E, Lizzit S, Kartouzian A, Heiz U, Baraldi A. The highest oxidation state observed in graphene-supported sub-nanometer iron oxide clusters. Commun Chem 2023; 6:61. [PMID: 37012362 PMCID: PMC10070315 DOI: 10.1038/s42004-023-00865-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Accepted: 03/24/2023] [Indexed: 04/05/2023] Open
Abstract
Size-selected iron oxide nanoclusters are outstanding candidates for technological-oriented applications due to their high efficiency-to-cost ratio. However, despite many theoretical studies, experimental works on their oxidation mechanism are still limited to gas-phase clusters. Herein we investigate the oxidation of graphene-supported size-selected Fen clusters by means of high-resolution X-ray Photoelectron Spectroscopy. We show a dependency of the core electron Fe 2p3/2 binding energy of metallic and oxidized clusters on the cluster size. Binding energies are also linked to chemical reactivity through the asymmetry parameter which is related to electron density of states at the Fermi energy. Upon oxidation, iron atoms in clusters reach the oxidation state Fe(II) and the absence of other oxidation states indicates a Fe-to-O ratio close to 1:1, in agreement with previous theoretical calculations and gas-phase experiments. Such knowledge can provide a basis for a better understanding of the behavior of iron oxide nanoclusters as supported catalysts.
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Affiliation(s)
- Deborah Perco
- Department of Physics, University of Trieste, Via Valerio 2, 34127, Trieste, Italy
| | - Federico Loi
- Department of Physics, University of Trieste, Via Valerio 2, 34127, Trieste, Italy
| | - Luca Bignardi
- Department of Physics, University of Trieste, Via Valerio 2, 34127, Trieste, Italy
| | - Luca Sbuelz
- Department of Physics, University of Trieste, Via Valerio 2, 34127, Trieste, Italy
| | - Paolo Lacovig
- Elettra - Sincrotrone Trieste, AREA Science Park, 34149, Trieste, Italy
| | - Ezequiel Tosi
- Elettra - Sincrotrone Trieste, AREA Science Park, 34149, Trieste, Italy
| | - Silvano Lizzit
- Elettra - Sincrotrone Trieste, AREA Science Park, 34149, Trieste, Italy
| | - Aras Kartouzian
- Department of Chemistry, Technical University of Munich, Lichtenbergstrasse 4, 85748, Garching, Germany
| | - Ueli Heiz
- Department of Chemistry, Technical University of Munich, Lichtenbergstrasse 4, 85748, Garching, Germany
| | - Alessandro Baraldi
- Department of Physics, University of Trieste, Via Valerio 2, 34127, Trieste, Italy.
- Elettra - Sincrotrone Trieste, AREA Science Park, 34149, Trieste, Italy.
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6
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Yu J, Jin H, Wang Q, Wei X, Chen H, Wang Y. Coalescence of Au-Pd Nanoropes and their Application as Enhanced Electrocatalysts for the Oxygen Reduction Reaction. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2203458. [PMID: 36123144 DOI: 10.1002/smll.202203458] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 08/16/2022] [Indexed: 06/15/2023]
Abstract
Lattice distortions and defects can lead to a strain effect that greatly affects the electronic structure of the noble metal surface and the chemical adsorption of ligands on the surfaces. Introducing defects is an efficient strategy to improve the activity of noble metal catalysts. Herein, a fusion approach is developed to fine-tune the defects and lattice strain in Au-Pd nanowires. Specifically, braided strands in Au-Pd nanoropes gradually coalesce to form solid nanowires upon H2 O2 treatment and heating, leading to a series of Au-Pd nanowires with various amounts of defects. Owing to the 1D morphology, as well as the optimized lattice strain and surface electronic structure, the intermediate Au-Pd nanowire obtained after 60 min heating (denoted as Au-Pd NW60 ) exhibits excellent catalytic activity and stability toward the oxygen reduction reaction, with the half-wave potential at 0.918 V, 45 mV higher than that of the commercial Pt/C; and specific activity reaches up to 1.7 mA cm-2 , 7.3 times higher than that of the Pt/C.
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Affiliation(s)
- Jialong Yu
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816, P. R. China
| | - Hui Jin
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816, P. R. China
| | - Qian Wang
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816, P. R. China
| | - Xiaoliang Wei
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816, P. R. China
| | - Hongyu Chen
- School of Science, Westlake University, Hangzhou, 310064, P. R. China
| | - Yawen Wang
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 211816, P. R. China
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7
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Ansari JR, Singh N, Anwar S, Mohapatra S, Datta A. Silver nanoparticles decorated two dimensional MoS2 nanosheets for enhanced photocatalytic activity. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2021.128102] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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8
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Nouneh K, Khaaissa Y, Talbi A, Taghzouti O, Belahmar A, El Mabrouk K, Zekriti M, El Mouakibi A, Oyama M. Improving Seeding Growth Method for Preparing Densely Attached Spherical Gold Nanoparticles on Solid Substrate. INTERNATIONAL JOURNAL OF NANOSCIENCE 2022. [DOI: 10.1142/s0219581x21500563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
In this paper, a modified seed-mediated growth approach to produce gold nanoparticles through HAuCl4 chemical reduction in water fabricated by growth process on indium tin oxide (ITO) was proposed. Particular attention was devoted to exploring the seeding and growth number cycle process in the formation of Au nanoparticles on the ITO surface. In agreement with the assumed analytical model, we have found that the absorbance maximum intensity [Formula: see text] depends substantially on the metal nanoparticles’ sizes, shape and density on the ITO surface. The deposited nanoparticles’ synthesized parameters were evaluated by the surface images obtained using field emission scanning electron microscopy (FE-SEM), UV-Vis spectroscopy and electrochemical measurements. The results show that the electrochemical responses of the as-prepared sample were significantly improved, in particular for the 2-cycle seeded particles followed by one-cycle growth.
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Affiliation(s)
- K. Nouneh
- Laboratory of Materials Physics & Subatomics, Department of Physics, Faculty of Science, Ibn Tofail University, BP. 242 14000, Kenitra, Morocco
| | - Y. Khaaissa
- Laboratory of Materials Physics & Subatomics, Department of Physics, Faculty of Science, Ibn Tofail University, BP. 242 14000, Kenitra, Morocco
| | - A. Talbi
- Laboratory of Materials Physics & Subatomics, Department of Physics, Faculty of Science, Ibn Tofail University, BP. 242 14000, Kenitra, Morocco
| | - O. K. Taghzouti
- Laboratory of Materials Physics & Subatomics, Department of Physics, Faculty of Science, Ibn Tofail University, BP. 242 14000, Kenitra, Morocco
- Euromed Research Center, Euromed Engineering Faculty, Euromed University of Fes, Eco-Campus, Campus UEMF BP51, Fes, Morocco
| | - A. Belahmar
- Laboratory of Materials Physics & Subatomics, Department of Physics, Faculty of Science, Ibn Tofail University, BP. 242 14000, Kenitra, Morocco
| | - K. El Mabrouk
- Euromed Research Center, Euromed Engineering Faculty, Euromed University of Fes, Eco-Campus, Campus UEMF BP51, Fes, Morocco
| | - M. Zekriti
- Euromed Research Center, Euromed Engineering Faculty, Euromed University of Fes, Eco-Campus, Campus UEMF BP51, Fes, Morocco
| | | | - M. Oyama
- Nanomaterials Chemistry Laboratory, Department of Materials Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8520, Japan
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9
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Liu G, Zhou W, Ji Y, Chen B, Fu G, Yun Q, Chen S, Lin Y, Yin PF, Cui X, Liu J, Meng F, Zhang Q, Song L, Gu L, Zhang H. Hydrogen-Intercalation-Induced Lattice Expansion of Pd@Pt Core-Shell Nanoparticles for Highly Efficient Electrocatalytic Alcohol Oxidation. J Am Chem Soc 2021; 143:11262-11270. [PMID: 34281338 DOI: 10.1021/jacs.1c05856] [Citation(s) in RCA: 67] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Lattice engineering on specific facets of metal catalysts is critically important not only for the enhancement of their catalytic performance but also for deeply understanding the effect of facet-based lattice engineering on catalytic reactions. Here, we develop a facile two-step method for the lattice expansion on specific facets, i.e., Pt(100) and Pt(111), of Pt catalysts. We first prepare the Pd@Pt core-shell nanoparticles exposed with the Pt(100) and Pt(111) facets, respectively, via the Pd-seeded epitaxial growth, and then convert the Pd core to PdH0.43 by hydrogen intercalation. The lattice expansion of the Pd core induces the lattice enlargement of the Pt shell, which can significantly promote the alcohol oxidation reaction (AOR) on both Pt(100) and Pt(111) facets. Impressively, Pt mass specific activities of 32.51 A mgPt-1 for methanol oxidation and 14.86 A mgPt-1 for ethanol oxidation, which are 41.15 and 25.19 times those of the commercial Pt/C catalyst, respectively, have been achieved on the Pt(111) facet. Density functional theory (DFT) calculations indicate that the remarkably improved catalytic performance on both the Pt(100) and the Pt(111) facets through lattice expansion arises from the enhanced OH adsorption. This work not only paves the way for lattice engineering on specific facets of nanomaterials to enhance their electrocatalytic activity but also offers a promising strategy toward the rational design and preparation of highly efficient catalysts.
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Affiliation(s)
- Guigao Liu
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China.,National Special Superfine Powder Engineering Research Center, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China
| | - Wei Zhou
- Department of Applied Physics, Tianjin Key Laboratory of Low Dimensional Materials Physics, Preparing Technology Faculty of Science, Tianjin University, Tianjin 300072, China
| | - Yiru Ji
- Institute of Physics, Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Bo Chen
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Gengtao Fu
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459 Singapore
| | - Qinbai Yun
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Shuangming Chen
- National Synchrotron Radiation Laboratory, CAS Centre for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui 230029, China
| | - Yunxiang Lin
- National Synchrotron Radiation Laboratory, CAS Centre for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui 230029, China.,Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China
| | - Peng-Fei Yin
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Xiaoya Cui
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Jiawei Liu
- Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Fanqi Meng
- Institute of Physics, Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Qinghua Zhang
- Institute of Physics, Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Li Song
- National Synchrotron Radiation Laboratory, CAS Centre for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui 230029, China
| | - Lin Gu
- Institute of Physics, Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China.,School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China.,Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Hua Zhang
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China.,Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), City University of Hong Kong, Kowloon,Hong Kong, China.,Shenzhen Research Institute, City University of Hong Kong, Shenzhen 518057, China
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10
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Zhang S, Liu K, Liu Z, Liu M, Zhang Z, Qiao Z, Ming L, Gao C. Highly Strained Au-Ag-Pd Alloy Nanowires for Boosted Electrooxidation of Biomass-Derived Alcohols. NANO LETTERS 2021; 21:1074-1082. [PMID: 33448860 DOI: 10.1021/acs.nanolett.0c04395] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Although strain engineering is effective in boosting the activities of noble metal catalysts, it remains desirable to construct fully strained catalysts to push the activity to even higher levels. Herein, we report a novel route to strong lattice strains of a Pd-based catalyst by radial growth of a Pd-rich phase on Au-Ag alloy nanowires that are no thicker than 1.5 nm. It creates not only tensile strains in the Pd-rich sheath due to the core-sheath lattice mismatch but also distortion and twinning of the lattice, producing nonhomogeneous local strains as hotspots for the catalysis. Toward the electrochemical oxidation of biomass-derived alcohols including ethanol, ethylene glycol, and glycerol, the highly strained nanowires outperformed their less strained counterparts and reached up to 13.6, 18.2, and 11.1 A mgPd-1, respectively. This strain engineering strategy may open new avenues to highly efficient catalysts for direct alcohol fuel cells and many other applications.
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Affiliation(s)
- Shumeng Zhang
- Center for Materials Chemistry, Frontier Institute of Science and Technology, and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710054, China
| | - Kai Liu
- Center for Materials Chemistry, Frontier Institute of Science and Technology, and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710054, China
| | - Zhaojun Liu
- Center for Materials Chemistry, Frontier Institute of Science and Technology, and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710054, China
| | - Moxuan Liu
- Center for Materials Chemistry, Frontier Institute of Science and Technology, and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710054, China
| | - Zhixue Zhang
- Center for Materials Chemistry, Frontier Institute of Science and Technology, and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710054, China
| | - Zhun Qiao
- Center for Materials Chemistry, Frontier Institute of Science and Technology, and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710054, China
| | - Liang Ming
- Fengcheng Advanced Energy Materials Research Institute, Ningbo, Zhejiang 315500, China
| | - Chuanbo Gao
- Center for Materials Chemistry, Frontier Institute of Science and Technology, and State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710054, China
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11
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Sun C. The BOLS-NEP theory reconciling the attributes of undercoordinated adatoms, defects, surfaces and nanostructures. NANO MATERIALS SCIENCE 2020. [DOI: 10.1016/j.nanoms.2019.12.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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12
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Bagus PS, Sousa C, Illas F. Limitations of the equivalent core model for understanding core-level spectroscopies. Phys Chem Chem Phys 2020; 22:22617-22626. [PMID: 33015691 DOI: 10.1039/d0cp03569f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The equivalent core model, or the Z + 1 approximation, has been used to interpret the binding energy, BE, shifts observed in X-ray photoelectron spectroscopy, XPS; in particular to relate these shifts to their origin in the electronic structure of the system. Indeed, a recent paper has claimed that the equivalent core model provides an intuitive chemical view of XPS BE shifts. In the present paper, we present a detailed comparison of the electronic structure provided from rigorous core-hole theory and from the equivalent core model to assess the validity and the utility of the use of the equivalent core model. This comparison shows that the equivalent core model provides a qualitative view of the different properties of initial and core-hole electronic structure. It is also shown that a very serious limitation of the equivalent core model is that it fails to distinguish between initial and final state contributions to the shifts of BEs which seriously reduces the utility of the information obtained with the equivalent core model. Indeed, there is a danger of making an incorrect assignment of the importance of relaxation because the equivalent core model appears to stress the role of final state effects. Given the importance of the distinction of initial and final state effects, we provide rigorous definitions of these two effects and we discuss an example where an incorrect interpretation was made based on the use of the equivalent core model.
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Affiliation(s)
- Paul S Bagus
- Department of Chemistry, University of North Texas, Denton, TX 76203-5017, USA.
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13
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Spectroscopic and kinetic insights into the methane reforming over Ce-pyrochlores. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2020.110964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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14
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Chau YTR, Nguyen MT, Zhu M, Romier A, Tokunaga T, Yonezawa T. Synthesis of composition-tunable Pd–Cu alloy nanoparticles by double target sputtering. NEW J CHEM 2020. [DOI: 10.1039/d0nj00288g] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work, we introduce a green synthesis technique, double-target sputtering into a liquid polymer – polyethylene glycol (PEG, M. W. = 600), to synthesize palladium–copper (Pd–Cu) alloy nanoparticles (NPs) dispersed in PEG.
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Affiliation(s)
- Yuen-ting Rachel Chau
- Division of Materials and Engineering
- Faculty of Engineering
- Hokkaido University
- Hokkaido 060-8628
- Japan
| | - Mai Thanh Nguyen
- Division of Materials and Engineering
- Faculty of Engineering
- Hokkaido University
- Hokkaido 060-8628
- Japan
| | - Mingbei Zhu
- Division of Materials and Engineering
- Faculty of Engineering
- Hokkaido University
- Hokkaido 060-8628
- Japan
| | - Arnaud Romier
- Division of Materials and Engineering
- Faculty of Engineering
- Hokkaido University
- Hokkaido 060-8628
- Japan
| | - Tomoharu Tokunaga
- Institute of Materials and Systems for Sustainability
- Nagoya University
- Furo-cho
- Chikusa-ku
- Nagoya 464-8601
| | - Tetsu Yonezawa
- Division of Materials and Engineering
- Faculty of Engineering
- Hokkaido University
- Hokkaido 060-8628
- Japan
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15
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Kiraly B, Liu X, Wang L, Zhang Z, Mannix AJ, Fisher BL, Yakobson BI, Hersam MC, Guisinger NP. Borophene Synthesis on Au(111). ACS NANO 2019; 13:3816-3822. [PMID: 30844248 DOI: 10.1021/acsnano.8b09339] [Citation(s) in RCA: 112] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Borophene (the first two-dimensional (2D) allotrope of boron) is emerging as a groundbreaking system for boron-based chemistry and, more broadly, the field of low-dimensional materials. Exploration of the phase space for growth is critical because borophene is a synthetic 2D material that does not have a bulk layered counterpart and thus cannot be isolated via exfoliation methods. Herein, we report synthesis of borophene on Au(111) substrates. Unlike previously studied growth on Ag substrates, boron diffuses into Au at elevated temperatures and segregates to the surface to form borophene islands as the substrate cools. These observations are supported by ab initio modeling of interstitial boron diffusion into the Au lattice. Borophene synthesis also modifies the surface reconstruction of the Au(111) substrate, resulting in a trigonal network that templates growth at low coverage. This initial growth is composed of discrete borophene nanoclusters, whose shape and size are consistent with theoretical predictions. As the concentration of boron increases, nanotemplating breaks down and larger borophene islands are observed. Spectroscopic measurements reveal that borophene grown on Au(111) possesses a metallic electronic structure, suggesting potential applications in 2D plasmonics, superconductivity, interconnects, electrodes, and transparent conductors.
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Affiliation(s)
- Brian Kiraly
- Center for Nanoscale Materials, Argonne National Laboratory , 9700 South Cass Avenue, Building 440 , Argonne , Illinois 60439 , United States
- Department of Materials Science and Engineering , Northwestern University , 2220 Campus Drive , Evanston , Illinois 60208 , United States
| | - Xiaolong Liu
- Applied Physics Graduate Program , Northwestern University , 2220 Campus Drive , Evanston , Illinois 60208 , United States
| | - Luqing Wang
- Department of Materials Science and NanoEngineering and Department of Chemistry , Rice University , Houston , Texas 77005 , United States
| | - Zhuhua Zhang
- State Key Laboratory of Mechanics and Control of Mechanical Structures and Institute of Nano Science , Nanjing University of Aeronautics and Astronautics , Nanjing 210016 , China
| | - Andrew J Mannix
- Center for Nanoscale Materials, Argonne National Laboratory , 9700 South Cass Avenue, Building 440 , Argonne , Illinois 60439 , United States
- Department of Materials Science and Engineering , Northwestern University , 2220 Campus Drive , Evanston , Illinois 60208 , United States
| | - Brandon L Fisher
- Center for Nanoscale Materials, Argonne National Laboratory , 9700 South Cass Avenue, Building 440 , Argonne , Illinois 60439 , United States
| | - Boris I Yakobson
- Department of Materials Science and NanoEngineering and Department of Chemistry , Rice University , Houston , Texas 77005 , United States
| | - Mark C Hersam
- Department of Materials Science and Engineering , Northwestern University , 2220 Campus Drive , Evanston , Illinois 60208 , United States
- Applied Physics Graduate Program , Northwestern University , 2220 Campus Drive , Evanston , Illinois 60208 , United States
- Department of Chemistry , Northwestern University , 2220 Campus Drive , Evanston , Illinois 60208 , United States
| | - Nathan P Guisinger
- Center for Nanoscale Materials, Argonne National Laboratory , 9700 South Cass Avenue, Building 440 , Argonne , Illinois 60439 , United States
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16
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Bagus PS, Ilton E, Nelin CJ. Extracting Chemical Information from XPS Spectra: A Perspective. Catal Letters 2018. [DOI: 10.1007/s10562-018-2417-1] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Tuo YX, Shi LJ, Cheng HY, Zhu YA, Yang ML, Xu J, Han YF, Li P, Yuan WK. Insight into the support effect on the particle size effect of Pt/C catalysts in dehydrogenation. J Catal 2018. [DOI: 10.1016/j.jcat.2018.02.001] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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18
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Li J, Tian Q, Jiang S, Zhang Y, Wu Y. Electrocatalytic performances of phosphorus doped carbon supported Pd towards formic acid oxidation. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.06.041] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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19
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Dong H, Tang S, Hao Y, Yu H, Dai W, Zhao G, Cao Y, Lu H, Zhang X, Ju H. Fluorescent MoS2 Quantum Dots: Ultrasonic Preparation, Up-Conversion and Down-Conversion Bioimaging, and Photodynamic Therapy. ACS APPLIED MATERIALS & INTERFACES 2016; 8:3107-14. [PMID: 26761391 DOI: 10.1021/acsami.5b10459] [Citation(s) in RCA: 159] [Impact Index Per Article: 19.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Small size molybdenum disulfide (MoS2) quantum dots (QDs) with desired optical properties were controllably synthesized by using tetrabutylammonium-assisted ultrasonication of multilayered MoS2 powder via OH-mediated chain-like Mo-S bond cleavage mode. The tunable up-bottom approach of precise fabrication of MoS2 QDs finally enables detailed experimental investigations of their optical properties. The synthesized MoS2 QDs present good down-conversion photoluminescence behaviors and exhibit remarkable up-conversion photoluminescence for bioimaging. The mechanism of the emerging photoluminescence was investigated. Furthermore, superior (1)O2 production ability of MoS2 QDs to commercial photosensitizer PpIX was demonstrated, which has great potential application for photodynamic therapy. These early affording results of tunable synthesis of MoS2 QDs with desired photo properties can lead to application in fields of biomedical and optoelectronics.
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Affiliation(s)
- Haifeng Dong
- Beijing Key Laboratory for Bioengineering and Sensing Technology, Research Center for Bioengineering and Sensing Technology, School of Chemistry & Biological Engineering, University of Science & Technology Beijing , Beijing 100083, People's Republic of China
| | - Songsong Tang
- Beijing Key Laboratory for Bioengineering and Sensing Technology, Research Center for Bioengineering and Sensing Technology, School of Chemistry & Biological Engineering, University of Science & Technology Beijing , Beijing 100083, People's Republic of China
| | - Yansong Hao
- Beijing Key Laboratory for Bioengineering and Sensing Technology, Research Center for Bioengineering and Sensing Technology, School of Chemistry & Biological Engineering, University of Science & Technology Beijing , Beijing 100083, People's Republic of China
| | - Haizhu Yu
- Beijing Key Laboratory for Bioengineering and Sensing Technology, Research Center for Bioengineering and Sensing Technology, School of Chemistry & Biological Engineering, University of Science & Technology Beijing , Beijing 100083, People's Republic of China
| | - Wenhao Dai
- Beijing Key Laboratory for Bioengineering and Sensing Technology, Research Center for Bioengineering and Sensing Technology, School of Chemistry & Biological Engineering, University of Science & Technology Beijing , Beijing 100083, People's Republic of China
| | - Guifeng Zhao
- Beijing Key Laboratory for Bioengineering and Sensing Technology, Research Center for Bioengineering and Sensing Technology, School of Chemistry & Biological Engineering, University of Science & Technology Beijing , Beijing 100083, People's Republic of China
| | - Yu Cao
- Beijing Key Laboratory for Bioengineering and Sensing Technology, Research Center for Bioengineering and Sensing Technology, School of Chemistry & Biological Engineering, University of Science & Technology Beijing , Beijing 100083, People's Republic of China
| | - Huiting Lu
- Department of Environmental Science and Engineering, School of Chemistry and Environment, Beijing University of Aeronautics and Astronautics , Beijing 100083, People's Republic of China
| | - Xueji Zhang
- Beijing Key Laboratory for Bioengineering and Sensing Technology, Research Center for Bioengineering and Sensing Technology, School of Chemistry & Biological Engineering, University of Science & Technology Beijing , Beijing 100083, People's Republic of China
| | - Huangxian Ju
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210093, People's Republic of China
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20
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Bennett E, Monzó J, Humphrey J, Plana D, Walker M, McConville C, Fermin D, Yanson A, Rodriguez P. A Synthetic Route for the Effective Preparation of Metal Alloy Nanoparticles and Their Use as Active Electrocatalysts. ACS Catal 2016. [DOI: 10.1021/acscatal.5b02598] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Elizabeth Bennett
- School
of Chemistry, University of Birmingham, Edgbaston B15 2TT, U.K
| | - Javier Monzó
- School
of Chemistry, University of Birmingham, Edgbaston B15 2TT, U.K
| | - Jo Humphrey
- School
of Chemistry, University of Bristol, Cantocks Close, Bristol BS8 1TS, U.K
| | - Daniela Plana
- School
of Chemistry, University of Bristol, Cantocks Close, Bristol BS8 1TS, U.K
| | - Marc Walker
- Department
of Physics, University of Warwick, Coventry CV4 7AL, U.K
| | | | - David Fermin
- School
of Chemistry, University of Bristol, Cantocks Close, Bristol BS8 1TS, U.K
| | - Alex Yanson
- Cosine Measurement Systems, Oosteinde 36, 2361 HE Leiden, The Netherlands
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21
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Villa A, Dimitratos N, Chan-Thaw CE, Hammond C, Veith GM, Wang D, Manzoli M, Prati L, Hutchings GJ. Characterisation of gold catalysts. Chem Soc Rev 2016; 45:4953-94. [DOI: 10.1039/c5cs00350d] [Citation(s) in RCA: 118] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Au-based catalysts have established a new important field of catalysis, revealing specific properties in terms of both high activity and selectivity for many reactions.
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Affiliation(s)
- Alberto Villa
- Dipartimento di Chimica
- Università degli studi di Milano
- Milano
- Italy
| | | | | | | | - Gabriel M. Veith
- Materials Science and Technology Division
- Oak Ridge National Laboratory
- Oak Ridge
- USA
| | - Di Wang
- Institute of Nanotechnology and Karlsruhe Nano Micro Facility Karlsruhe Institute of Technology (KIT)
- 76344 Eggenstein-Leopoldshafen
- Germany
| | - Maela Manzoli
- Dipartimento di Chimica
- Università degli Studi di Torino
- Torino
- Italy
| | - Laura Prati
- Dipartimento di Chimica
- Università degli studi di Milano
- Milano
- Italy
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22
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Sneed BT, Young AP, Tsung CK. Building up strain in colloidal metal nanoparticle catalysts. NANOSCALE 2015; 7:12248-12265. [PMID: 26147486 DOI: 10.1039/c5nr02529j] [Citation(s) in RCA: 101] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The focus on surface lattice strain in nanostructures as a fundamental research topic has gained momentum in recent years as scientists investigated its significant impact on the surface electronic structure and catalytic properties of nanomaterials. Researchers have begun to tell a more complete story of catalysis from a perspective which brings this concept to the forefront of the discussion. The nano-'realm' makes the effects of surface lattice strain, which acts on the same spatial scales, more pronounced due to a higher ratio of surface to bulk atoms. This is especially evident in the field of metal nanoparticle catalysis, where displacement of atoms on surfaces can significantly alter the sorption properties of molecules. In part, the concept of strain-engineering for catalysis opened up due to the achievements that were made in the synthesis of a more sophisticated nanoparticle library from an ever-expanding set of methodologies. Developing synthesis methods for metal nanoparticles with well-defined and strained architectures is a worthy goal that, if reached, will have considerable impact in the search for catalysts. In this review, we summarize the recent accomplishments in the area of surface lattice-strained metal nanoparticle synthesis, framing the discussion from the important perspective of surface lattice strain effects in catalysis.
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Affiliation(s)
- Brian T Sneed
- Boston College Chemistry Department, Merkert Chemistry Center, 2609 Beacon St, Chestnut Hill, MA 02467, USA.
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23
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Mironenko RM, Belskaya OB, Gulyaeva TI, Nizovskii AI, Kalinkin AV, Bukhtiyarov VI, Lavrenov AV, Likholobov VA. Effect of the nature of carbon support on the formation of active sites in Pd/C and Ru/C catalysts for hydrogenation of furfural. Catal Today 2015. [DOI: 10.1016/j.cattod.2014.10.037] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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24
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Liu X, Zhang X, Bo M, Li L, Tian H, Nie Y, Sun Y, Xu S, Wang Y, Zheng W, Sun CQ. Coordination-resolved electron spectrometrics. Chem Rev 2015; 115:6746-810. [PMID: 26110615 DOI: 10.1021/cr500651m] [Citation(s) in RCA: 111] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Xinjuan Liu
- †Institute of Coordination Bond Metrology and Engineering, College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China
| | - Xi Zhang
- ‡Institute of Nanosurface Science and Engineering, Shenzhen University, Shenzhen 518060, China
| | - Maolin Bo
- §Key Laboratory of Low-Dimensional Materials and Application Technologies (Ministry of Education) and School of Materials Science and Engineering, Xiangtan University, Hunan 411105, China
| | - Lei Li
- ∥School of Materials Science, Jilin University, Changchun 130012, China
| | - Hongwei Tian
- ∥School of Materials Science, Jilin University, Changchun 130012, China
| | - Yanguang Nie
- ⊥School of Science, Jiangnan University, Wuxi 214122, China
| | - Yi Sun
- #Harris School of Public Policy, University of Chicago, Chicago, Illinois 60637, United States
| | - Shiqing Xu
- †Institute of Coordination Bond Metrology and Engineering, College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China
| | - Yan Wang
- ∇School of Information Technology, Hunan University of Science and Technology, Xiangtan 411201, China
| | - Weitao Zheng
- ∥School of Materials Science, Jilin University, Changchun 130012, China
| | - Chang Q Sun
- ○NOVITAS, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore
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25
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Dang D, Zou H, Xiong Z, Hou S, Shu T, Nan H, Zeng X, Zeng J, Liao S. High-Performance, Ultralow Platinum Membrane Electrode Assembly Fabricated by In Situ Deposition of a Pt Shell Layer on Carbon-Supported Pd Nanoparticles in the Catalyst Layer Using a Facile Pulse Electrodeposition Approach. ACS Catal 2015. [DOI: 10.1021/acscatal.5b00030] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dai Dang
- School of Chemistry and Chemical Engineering, South China University of Technology, The Key Laboratory of Fuel Cell Technology of Guangdong Province & The Key Laboratory of New Energy Technology of Guangdong Universities, Guangzhou 510641, China
| | - Haobin Zou
- School of Chemistry and Chemical Engineering, South China University of Technology, The Key Laboratory of Fuel Cell Technology of Guangdong Province & The Key Laboratory of New Energy Technology of Guangdong Universities, Guangzhou 510641, China
| | - Zi’ang Xiong
- School of Chemistry and Chemical Engineering, South China University of Technology, The Key Laboratory of Fuel Cell Technology of Guangdong Province & The Key Laboratory of New Energy Technology of Guangdong Universities, Guangzhou 510641, China
| | - Sanying Hou
- School of Chemistry and Chemical Engineering, South China University of Technology, The Key Laboratory of Fuel Cell Technology of Guangdong Province & The Key Laboratory of New Energy Technology of Guangdong Universities, Guangzhou 510641, China
| | - Ting Shu
- School of Chemistry and Chemical Engineering, South China University of Technology, The Key Laboratory of Fuel Cell Technology of Guangdong Province & The Key Laboratory of New Energy Technology of Guangdong Universities, Guangzhou 510641, China
| | - Haoxiong Nan
- School of Chemistry and Chemical Engineering, South China University of Technology, The Key Laboratory of Fuel Cell Technology of Guangdong Province & The Key Laboratory of New Energy Technology of Guangdong Universities, Guangzhou 510641, China
| | - Xiaoyuan Zeng
- School of Chemistry and Chemical Engineering, South China University of Technology, The Key Laboratory of Fuel Cell Technology of Guangdong Province & The Key Laboratory of New Energy Technology of Guangdong Universities, Guangzhou 510641, China
| | - Jianhuang Zeng
- School of Chemistry and Chemical Engineering, South China University of Technology, The Key Laboratory of Fuel Cell Technology of Guangdong Province & The Key Laboratory of New Energy Technology of Guangdong Universities, Guangzhou 510641, China
| | - Shijun Liao
- School of Chemistry and Chemical Engineering, South China University of Technology, The Key Laboratory of Fuel Cell Technology of Guangdong Province & The Key Laboratory of New Energy Technology of Guangdong Universities, Guangzhou 510641, China
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26
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Bellafont NP, Illas F, Bagus PS. Validation of Koopmans' theorem for density functional theory binding energies. Phys Chem Chem Phys 2015; 17:4015-9. [PMID: 25566985 DOI: 10.1039/c4cp05434b] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Both initial state effects, to a good approximation the electrostatic potential at the nucleus, and final state effects, due to the response of the electrons to the presence of the core-hole, contribute to core-level binding energies, BE's. For Hartree-Fock, HF, wavefunctions, Koopmans' theorem, KT, which states that the initial state BE = -ε ιs rigorous. However, the KT relationship is commonly used for Kohn-Sham, KS, ε's. We review that the KT relationship with KS ε's fails to give the absolute initial state contribution to the BE. However, we demonstrate that the shifts of initial state BE's from a reference value are accurately obtained from the shifts of the KS ε's. Thus the initial state contributions to BE shifts can be obtained from KT using KS ε's. This result validates a large body of work where KT has been used with KS ε's to define initial state contributions to BE shifts.
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Affiliation(s)
- Noèlia Pueyo Bellafont
- Departament de Química Física & Institut de Química Teòrica i Computacional (IQTCUB), Universitat de Barcelona, C/Martí i Franquès 1, 08028 Barcelona, Spain.
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27
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Biswas A, Banerjee A. Sunlight induced unique morphological transformation in graphene based nanohybrids: appearance of a new tetra-nanohybrid and tuning of functional property of these nanohybrids. SOFT MATTER 2015; 11:4226-4234. [PMID: 25892272 DOI: 10.1039/c5sm00359h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In this study, sunlight was used for in situ preparation of gel-based various nanohybrid systems. A naturally occurring amino acid, l-phenylalanine derivative formed a hydrogel with graphene oxide (GO)/reduced graphene oxide (rGO) at physiological pH. This hydrogel was then used in the presence of silver ions and diffuse sunlight to form initially a tri-nanohybrid system consisting of six atom silver nanoclusters, nanosheets, and nanofibers. Interestingly, a time-dependent morphological transformation occurs in this nanohybrid system to form one tri-nanohybrid to another tri-nanohybrid with the appearance of a novel, nanoscopic intermediate tetra-nanohybrid system consisting of four distinctly different nanomaterials (nanofibers, nanosheets, nanospheres, and nanoparticles). UV-Vis and fluorescence spectroscopic analyses, transmission electron microscopic, X-ray photo electron spectroscopic and MALDI-TOF mass spectral analyses with time were applied to characterise these morphological transformations in gel based nanohybrids. Time-dependent X-ray photo electron spectroscopic (XPS) analysis was used to uncover the mechanism for the transformation of silver nanoclusters to silver nanoparticles in the hydrogel matrix. Sunlight was used to trigger time-dependent structural transformation in the nanohybrid systems. Interestingly, one of these tri-nanohybrid systems (silver nanoparticles containing rGO based hydrogel) shows a catalytic property of reducing nitroarenes to aminoarenes and the catalytic efficiency can be modulated by changing the size of the silver nanoparticles with time in diffuse sunlight. The mechanism for different catalytic activities for different hybrids with varying size of silver nanoparticles has also been deciphered.
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Affiliation(s)
- Abhijit Biswas
- Department of Biological Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
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28
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Zhang Y, Han T, Zhu L, Fang J, Wang G, Xu J, Xu P, Li X, Liu CC. Pt35Cu65 nanoarchitecture: a highly durable and effective electrocatalyst towards methanol oxidation. NANOTECHNOLOGY 2015; 26:135706. [PMID: 25764571 DOI: 10.1088/0957-4484/26/13/135706] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Aiming at electro-catalytic performance enhancement and reduction of catalyst cost, PtxCu1-x (Pt35Cu65, Pt53Cu47, and Pt68Cu32) nanoarchitecture samples with controllable atomic composition, similar morphology and particle-size have been prepared by using a one-pot chemical route. The as-prepared PtxCu1-x nanoarchitectures are confirmed as consisting of the integration of initial small alloy nanoparticles (NPs), resulting in an interconnected nanoporous structure. The electrochemical experiments indicate that these PtxCu1-x nanocatalysts exhibit atomic composition dependent catalytic activity, although the surfaces of all the catalysts were characterized to be featured with a Pt enrichment structure. With optimal atomic composition, the Pt35Cu65 catalyst possesses enhanced electro-catalytic activities towards methanol oxidation in comparison with other PtxCu1-x samples and pure Pt catalyst with similar morphology. Furthermore, the integrated Pt35Cu65 nanoarchitecture displays good durability during the long term electrochemical scanning through as many as 1500 cycles. The comparable catalytic performance of Pt35Cu65 catalyst could be attributed to the interconnected initial small NPs, formation of open porous structure, durable nanoarchitecture, and synergetic effect of the alloyed atoms. The structural evolution from metastable small alloy NPs to integrated stable nanoarchitectures may provide new opportunities to design and prepare novel composite materials with durable structure and effective catalytic properties.
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Affiliation(s)
- Yuan Zhang
- Department of Chemistry, Shanghai University, Shanghai 200444, People's Republic of China. College of Material Science and Engineering, Shanghai University, Shanghai, 200444, People's Republic of China
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29
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Ma Y, Wang R, Wang H, Linkov V, Ji S. Evolution of nanoscale amorphous, crystalline and phase-segregated PtNiP nanoparticles and their electrocatalytic effect on methanol oxidation reaction. Phys Chem Chem Phys 2014; 16:3593-602. [PMID: 24414092 DOI: 10.1039/c3cp54600d] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The design of amorphous noble metallic nanoparticle electrocatalysts is an important fundamental and applied research challenge because their surface is rich in low-coordination sites and defects which could act as the active sites in various catalytic processes. Here we describe new findings on the amorphous platinum-nickel-phosphorous nanoparticles supported on carbon black (PtNiP(a)/C) and the comparison between their catalytic activity and that of the nanoscale crystalline and phase-segregated PtNiP nanoparticles. The nanoscale amorphous, crystalline and phase-segregated catalysts were probed as a function of surface composition, particle size, and thermal treatment conditions using X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, selected area electron diffraction and electrochemical characterization. The results provide the experimental evidence in support of nanoscale amorphous, crystalline, and phase-segregated PtNiP nanoparticles evolution dependence on the catalyst synthesis temperature. More importantly, the results of the electrochemical performance investigation showed that the amorphous structure has not only better catalytic activity for methanol oxidation but also stronger tolerance to carbon monoxide poisoning compared to the crystalline and phase-segregated structure. Besides, the thermal control of the formation of nanoscale amorphous, crystalline and phase-segregated structured catalysts provided the opportunity for establishing the correlation between the nanoscale phase structures of the catalysts and their electrocatalytic activity in methanol oxidation reaction, which plays an important role in developing highly active electrocatalysts for direct methanol fuel cells.
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Affiliation(s)
- Yanjiao Ma
- Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.
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Jothivenkatachalam K, Prabhu S, Nithya A, Jeganathan K. Facile synthesis of WO3 with reduced particle size on zeolite and enhanced photocatalytic activity. RSC Adv 2014. [DOI: 10.1039/c4ra01376j] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
WO3 supported on zeolite-Y (WO3-ZY) was successfully synthesized by a facile impregnation method and well characterized by various techniques.
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Affiliation(s)
| | - S. Prabhu
- Department of Chemistry
- Anna University
- BIT Campus
- Tiruchirappalli-620 024, India
| | - A. Nithya
- Department of Chemistry
- Anna University
- BIT Campus
- Tiruchirappalli-620 024, India
| | - K. Jeganathan
- Centre for Nanoscience and Nanotechnology
- School of Physics
- Bharathidasan University
- Tiruchirappalli-620 024, India
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31
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Sneed BT, Brodsky CN, Kuo CH, Lamontagne LK, Jiang Y, Wang Y, Tao F(F, Huang W, Tsung CK. Nanoscale-Phase-Separated Pd–Rh Boxes Synthesized via Metal Migration: An Archetype for Studying Lattice Strain and Composition Effects in Electrocatalysis. J Am Chem Soc 2013; 135:14691-700. [DOI: 10.1021/ja405387q] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Brian T. Sneed
- Department
of Chemistry, Merkert Chemistry Center, Boston College, 2609
Beacon Street, Chestnut Hill, Massachusetts 02467, United States
| | - Casey N. Brodsky
- Department
of Chemistry, Merkert Chemistry Center, Boston College, 2609
Beacon Street, Chestnut Hill, Massachusetts 02467, United States
| | - Chun-Hong Kuo
- Department
of Chemistry, Merkert Chemistry Center, Boston College, 2609
Beacon Street, Chestnut Hill, Massachusetts 02467, United States
| | - Leo K. Lamontagne
- Department
of Chemistry, Merkert Chemistry Center, Boston College, 2609
Beacon Street, Chestnut Hill, Massachusetts 02467, United States
| | - Ying Jiang
- Center
of Electron Microscopy and State Key Laboratory of Silicon Materials,
Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Yong Wang
- Center
of Electron Microscopy and State Key Laboratory of Silicon Materials,
Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Franklin (Feng) Tao
- Department
of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Weixin Huang
- Department
of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Chia-Kuang Tsung
- Department
of Chemistry, Merkert Chemistry Center, Boston College, 2609
Beacon Street, Chestnut Hill, Massachusetts 02467, United States
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32
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Jacquemin M, Genet MJ, Gaigneaux EM, Debecker DP. Calibration of the X-ray photoelectron spectroscopy binding energy scale for the characterization of heterogeneous catalysts: is everything really under control? Chemphyschem 2013; 14:3618-26. [PMID: 24009131 DOI: 10.1002/cphc.201300411] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Indexed: 11/10/2022]
Abstract
Investigations of X-ray photoelectron spectra from solid samples need corrections for the surface charging effect. For powder samples such as heterogeneous catalysts and their supports, the C-(C,H) component of the C 1s peak is often used as an internal standard for the calibration of the binding energy scale. Although this method is widely recognized as suitable for the study of heterogeneous catalysts, we show that a significant calibration bias can be encountered upon comparing samples with different bulk composition. In this paper, a series of SiO2-Al2O3 supports and Pd/SiO2-Al2O3 catalysts with various Si/Al ratios were studied. The spectra issued from these samples were processed with the classical calibration method on the basis of the carbon peak. Important discrepancies in the relative position of the photoelectron peaks were noticed. After systematically discarding instrument-related issues, a true chemical influence of the bulk matrix on the analyzed surface species was evidenced. The extent of this chemical effect was dependent on the composition of the sample and more precisely on its ionicity. Two possible mechanisms for this chemical effect were proposed and discussed. Finally, an alternative calibration method was offered.
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Affiliation(s)
- Marc Jacquemin
- Institute of Condensed Matter and Nanosciences (IMCN), Molecules, Solids and Reactivity (MOST), Université catholique de Louvain, Croix du Sud 2/L7.05.17, 1348 Louvain-la-Neuve (Belgium)
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34
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Cui CH, Liu XJ, Li HH, Gao MR, Liang HW, Yao HB, Yu SH. Ternary PtPdCu Electrocatalyst Formed through Surface-Atomic Redistribution against Leaching. ChemCatChem 2012. [DOI: 10.1002/cctc.201200070] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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35
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Ndlovu GF, Roos WD, Wang ZM, Asante JKO, Mashapa MG, Jafta CJ, Mwakikunga BW, Hillie KT. Epitaxial deposition of silver ultra-fine nano-clusters on defect-free surfaces of HOPG-derived few-layer graphene in a UHV multi-chamber by in situ STM, ex situ XPS, and ab initio calculations. NANOSCALE RESEARCH LETTERS 2012; 7:173. [PMID: 22395057 PMCID: PMC3312848 DOI: 10.1186/1556-276x-7-173] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2011] [Accepted: 03/06/2012] [Indexed: 05/31/2023]
Abstract
The growth of three-dimensional ultra-fine spherical nano-particles of silver on few layers of graphene derived from highly oriented pyrolytic graphite in ultra-high vacuum were characterized using in situ scanning tunneling microscopy (STM) in conjunction with X-ray photoelectron spectroscopy. The energetics of the Ag clusters was determined by DFT simulations. The Ag clusters appeared spherical with size distribution averaging approximately 2 nm in diameter. STM revealed the preferred site for the position of the Ag atom in the C-benzene ring of graphene. Of the three sites, the C-C bridge, the C-hexagon hollow, and the direct top of the C atom, Ag prefers to stay on top of the C atom, contrary to expectation of the hexagon-close packing. Ab initio calculations confirm the lowest potential energy between Ag and the graphene structure to be at the exact site determined from STM imaging.
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Affiliation(s)
- Gebhu F Ndlovu
- National Centre for Nano-structured Materials, Council for Scientific and Industrial Research (CSIR), Meiring Naude Road, Brummeria, 395 Pretoria, 0001, South Africa
- Department of Physics, University of the Free State, 205 Nelson Mandela Drive, 339 Bloemfontein, 9300, South Africa
| | - Wiets D Roos
- Department of Physics, University of the Free State, 205 Nelson Mandela Drive, 339 Bloemfontein, 9300, South Africa
| | - Zhiming M Wang
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, People's Republic of China
| | - Joseph KO Asante
- Department of Physics, Tshwane University of Technology, Private Bag X680 Pretoria, 0001, South Africa
| | - Matete G Mashapa
- National Centre for Nano-structured Materials, Council for Scientific and Industrial Research (CSIR), Meiring Naude Road, Brummeria, 395 Pretoria, 0001, South Africa
| | - Charl J Jafta
- Department of Physics, University of the Free State, 205 Nelson Mandela Drive, 339 Bloemfontein, 9300, South Africa
| | - Bonex W Mwakikunga
- National Centre for Nano-structured Materials, Council for Scientific and Industrial Research (CSIR), Meiring Naude Road, Brummeria, 395 Pretoria, 0001, South Africa
- Department of Physics, University of Malawi-The Polytechnic, Private Bag 303, Chichiri, Blantyre, 0003, Malawi
| | - Kenneth T Hillie
- National Centre for Nano-structured Materials, Council for Scientific and Industrial Research (CSIR), Meiring Naude Road, Brummeria, 395 Pretoria, 0001, South Africa
- Department of Physics, University of the Free State, 205 Nelson Mandela Drive, 339 Bloemfontein, 9300, South Africa
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Peng X, Tang F, Copple A. Engineering the work function of armchair graphene nanoribbons using strain and functional species: a first principles study. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:075501. [PMID: 22297686 DOI: 10.1088/0953-8984/24/7/075501] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
First principles density functional theory calculations were performed to study the effects of strain, edge passivation, and surface functional species on the structural and electronic properties of armchair graphene nanoribbons (AGNRs), with a particular focus on the work function. The work function was found to increase with uniaxial tensile strain and decrease with compression. The variation of the work function under strain is primarily due to the shift of the Fermi energy with strain. In addition, the relationship between the work function variation and the core level shift with strain is discussed. Distinct trends of the core level shift under tensile and compressive strain were discovered. For AGNRs with the edge carbon atoms passivated by oxygen, the work function is higher than for nanoribbons with the edge passivated by hydrogen under a moderate strain. The difference between the work functions in these two edge passivations is enlarged (reduced) under a sufficient tensile (compressive) strain. This has been correlated to a direct-indirect bandgap transition for tensile strains of about 4% and to a structural transformation for large compressive strains at about - 12%. Furthermore, the effect of the surface species decoration, such as H, F, or OH with different covering density, was investigated. It was found that the work function varies with the type and coverage of surface functional species. Decoration with F and OH increases the work function while H decreases it. The surface functional species were decorated on either one side or both sides of AGNRs. The difference in the work functions between one-sided and two-sided decorations was found to be relatively small, which may suggest an introduced surface dipole plays a minor role.
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Affiliation(s)
- Xihong Peng
- Department of Applied Sciences and Mathematics, Arizona State University, Mesa, AZ 85212, USA.
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37
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Biesinger MC, Lau LWM, Gerson AR, Smart RSC. The role of the Auger parameter in XPS studies of nickel metal, halides and oxides. Phys Chem Chem Phys 2012; 14:2434-42. [DOI: 10.1039/c2cp22419d] [Citation(s) in RCA: 216] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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38
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Cherevko S, Xing X, Chung CH. Pt and Pd decorated Au nanowires: Extremely high activity of ethanol oxidation in alkaline media. Electrochim Acta 2011. [DOI: 10.1016/j.electacta.2011.04.052] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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39
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Lei Y, Jelic J, Nitsche LC, Meyer R, Miller J. Effect of Particle Size and Adsorbates on the L3, L2 and L1 X-ray Absorption Near Edge Structure of Supported Pt Nanoparticles. Top Catal 2011. [DOI: 10.1007/s11244-011-9662-5] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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40
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Luo MF, Wang CC, Chao CS, Ho CY, Wang CT, Lin WR, Lin YC, Lai YL, Hsu YJ. Temperature-dependent structuring of Au–Pt bimetallic nanoclusters on a thin film of Al2O3/NiAl(100). Phys Chem Chem Phys 2011; 13:1531-41. [DOI: 10.1039/c0cp00954g] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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41
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Seo HO, Lee J, Kim KD, Luo Y, Dey NK, Kim YD. Changes in the surface structure of Pd/Ta2
O5
by oxygen and CO studied using X-ray Photoelectron Spectroscopy (XPS). SURF INTERFACE ANAL 2010. [DOI: 10.1002/sia.3725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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42
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Sun CQ. Dominance of broken bonds and nonbonding electrons at the nanoscale. NANOSCALE 2010; 2:1930-1961. [PMID: 20820643 DOI: 10.1039/c0nr00245c] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Although they exist ubiquitously in human bodies and our surroundings, the impact of nonbonding lone electrons and lone electron pairs has long been underestimated. Recent progress demonstrates that: (i) in addition to the shorter and stronger bonds between under-coordinated atoms that initiate the size trends of the otherwise constant bulk properties when a substance turns into the nanoscale, the presence of lone electrons near to broken bonds generates fascinating phenomena that bulk materials do not demonstrate; (ii) the lone electron pairs and the lone pair-induced dipoles associated with C, N, O, and F tetrahedral coordination bonding form functional groups in biological, organic, and inorganic specimens. By taking examples of surface vacancy, atomic chain end and terrace edge states, catalytic enhancement, conducting-insulating transitions of metal clusters, defect magnetism, Coulomb repulsion at nanoscale contacts, Cu(3)C(2)H(2) and Cu(3)O(2) surface dipole formation, lone pair neutralized interface stress, etc, this article will focus on the development and applications of theory regarding the energetics and dynamics of nonbonding electrons, aiming to raise the awareness of their revolutionary impact to the society. Discussion will also extend to the prospective impacts of nonbonding electrons on mysteries such as catalytic enhancement and catalysts design, the density anomalies of ice and negative thermal expansion, high critical temperature superconductivity induced by B, C, N, O, and F, the molecular structures and functionalities of CF(4) in anti-coagulation of synthetic blood, NO signaling, and enzyme telomeres, etc. Meanwhile, an emphasis is placed on the necessity and effectiveness of understanding the properties of substances from the perspective of bond and nonbond formation, dissociation, relaxation and vibration, and the associated energetics and dynamics of charge repopulation, polarization, densification, and localization. Finding and grasping the factors controlling the nonbonding states and making them of use in functional materials design and identifying their limitations will form, in the near future, a subject area of "nonbonding electronics and energetics", which could be even more challenging, fascinating, promising, and rewarding than dealing with core or valence electrons alone.
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Affiliation(s)
- Chang Q Sun
- School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore.
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Wang Z, Fu Q, Bao X. Effect of substrate surface reconstruction on interaction with adsorbates: Pt on 6H-SiC(0001). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:7227-7232. [PMID: 20131917 DOI: 10.1021/la904343w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Three reconstructed 6H-SiC(0001) surfaces, including a Si-rich 3 x 3 surface, a C-rich 6 square root(3) x 6 square root(3) surface, and a graphitized SiC surface, were used as substrates for the deposition of Pt overlayers. The interaction between Pt and the SiC(0001) surfaces was studied by X-ray photoelectron spectroscopy (XPS) and scanning tunneling microscopy (STM). Pt reacts readily with the 3 x 3 surface to form platinum silicide even at room temperature. On the graphitized SiC surface, metal particles with low lateral dispersion form and keep on aggregating upon annealing. In contrast, homogeneously distributed small Pt nanoclusters were grown on the C-rich 6 square root(3) x 6 square root(3) surface. The unique nanomesh surface structure helps to stabilize the Pt nanoclusters until 800 degrees C. Above 1000 degrees C, Pt tends to diffuse into the subsurface region, forming the C/Pt silicide/SiC(0001) interface structure. The different surface electronic structures of the three Pt/SiC(0001) systems were discussed as well. The present data show that surface reconstruction provides an effective route to control the growth of metal overlayers and the formation of metal/substrate interfaces.
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Affiliation(s)
- Zhen Wang
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, the Chinese Academy of Sciences, Dalian 116023, PR China
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45
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Pan JS, Tao JG, Huan CHA, Chiam SY, Zhang Z, Li DTH, Sun Y, Chai JW, Wang SJ, Sun CQ. Determination of atomic Ni interaction with TiO2 by XPS. SURF INTERFACE ANAL 2010. [DOI: 10.1002/sia.3356] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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46
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Kaden WE, Wu T, Kunkel WA, Anderson SL. Electronic Structure Controls Reactivity of Size-Selected Pd Clusters Adsorbed on TiO2 Surfaces. Science 2009; 326:826-9. [DOI: 10.1126/science.1180297] [Citation(s) in RCA: 486] [Impact Index Per Article: 32.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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47
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Qin ZH, Lewandowski M, Sun YN, Shaikhutdinov S, Freund HJ. Morphology and CO adsorption on platinum supported on thin Fe(3)O(4)(111) films. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:134019. [PMID: 21817494 DOI: 10.1088/0953-8984/21/13/134019] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Nucleation, growth and thermal stability of Pt particles supported on well ordered Fe(3)O(4)(111) thin films grown on Pt(111) were studied by scanning tunnelling microscopy (STM) and temperature programmed desorption (TPD) of CO. STM studies showed that Pt grows through the formation of single-layer islands that coalesce at high coverage. Vacuum annealing at 600 K caused Pt sintering and the formation of extended two-dimensional (2D) islands one and two layers in thickness at sub-monolayer coverage. Well faceted, three-dimensional (3D) Pt nanoparticles formed by annealing to temperatures above 800 K were encapsulated by an FeO(111) monolayer. These results were rationalized in terms of the high adhesion energy for Pt on iron oxide surfaces. CO TPD studies showed that 2D structures, formed at 600 K, exhibit much lower CO adsorption capacity as compared to the Pt(111) single crystal surface. This effect has been tentatively assigned to lattice expansion in the Pt 2D islands leading to weakening of the Pt-CO bond due to reduction of the [Formula: see text] back-donation.
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Affiliation(s)
- Z-H Qin
- Abteilung Chemische Physik, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, Berlin 14195, Germany
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Cheon Y, Suh M. Enhanced Hydrogen Storage by Palladium Nanoparticles Fabricated in a Redox-Active Metal-Organic Framework. Angew Chem Int Ed Engl 2009; 48:2899-903. [DOI: 10.1002/anie.200805494] [Citation(s) in RCA: 285] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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49
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Cheon Y, Suh M. Enhanced Hydrogen Storage by Palladium Nanoparticles Fabricated in a Redox-Active Metal-Organic Framework. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200805494] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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50
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Bianchettin L, Baraldi A, de Gironcoli S, Vesselli E, Lizzit S, Petaccia L, Comelli G, Rosei R. Core level shifts of undercoordinated Pt atoms. J Chem Phys 2008; 128:114706. [DOI: 10.1063/1.2841468] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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