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Wang TJ, Sun LB, Ai X, Chen P, Chen Y, Wang X. Boosting Formate Electrooxidation by Heterostructured PtPd Alloy and Oxides Nanowires. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2403664. [PMID: 38625813 DOI: 10.1002/adma.202403664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2024] [Revised: 04/09/2024] [Indexed: 04/18/2024]
Abstract
Direct formate fuel cells (DFFCs) receive increasing attention as promising technologies for the future energy mix and environmental sustainability, as formate can be made from carbon dioxide utilization and is carbon neutral. Herein, heterostructured platinum-palladium alloy and oxides nanowires (PtPd-ox NWs) with abundant defect sites are synthesized through a facile self-template method and demonstrated high activity toward formate electrooxidation reaction (FOR). The electronic tuning arising from the heterojunction between alloy and oxides influence the work function of PtPd-ox NWs. The sample with optimal work function reveals the favorable adsorption behavior for intermediates and strong interaction in the d-p orbital hybridization between Pt site and oxygen in formate, favoring the FOR direct pathway with a low energy barrier. Besides the thermodynamic regulation, the heterostructure can also provide sufficient hydroxyl species to facilitate the formation of carbon dioxide due to the ability of combining absorbed hydrogen and carbon monoxide at adjacent active sites, which contributes to the improvement of FOR kinetics on PtPd-ox NWs. Thus, heterostructured PtPd-ox NWs achieve dual regulation of FOR thermodynamics and kinetics, exhibiting remarkable performance and demonstrating potential in practical systems.
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Affiliation(s)
- Tian-Jiao Wang
- Key Laboratory of Macromolecular Science of Shaanxi Province, Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education), Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710062, P. R. China
- School of Chemical, Chemistry Engineering and Biotechnology, Nanyang Technological University, Singapore, 639798, Singapore
- Cambridge Centre for Advanced Research and Education in Singapore Ltd (Cambridge CARES), CREATE Tower, Singapore, 138602, Singapore
| | - Li-Bo Sun
- Cambridge Centre for Advanced Research and Education in Singapore Ltd (Cambridge CARES), CREATE Tower, Singapore, 138602, Singapore
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR, 999077, P. R. China
| | - Xuan Ai
- Key Laboratory of Macromolecular Science of Shaanxi Province, Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education), Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710062, P. R. China
| | - Pei Chen
- Key Laboratory of Macromolecular Science of Shaanxi Province, Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education), Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710062, P. R. China
| | - Yu Chen
- Key Laboratory of Macromolecular Science of Shaanxi Province, Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education), Shaanxi Key Laboratory for Advanced Energy Devices, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an, 710062, P. R. China
| | - Xin Wang
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR, 999077, P. R. China
- Hong Kong Branch of National Precious Metals Material Engineering Research Center, City University of Hong Kong, Kowloon, Hong Kong SAR, 999077, P. R. China
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Zheng X, Wu Q, Xiao M, Li L, Zhao R, Cui C. Electrochemical Redox Conversion of Formate to CO via Coupling Fe-Co Layered Double Hydroxides and Au Catalysts. Chemistry 2024; 30:e202303383. [PMID: 38164084 DOI: 10.1002/chem.202303383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2023] [Revised: 12/20/2023] [Accepted: 12/29/2023] [Indexed: 01/03/2024]
Abstract
Formate has been considered an inactive molecule and thus cannot be further reduced under CO2 reduction conditions, which limits its widespread application as feedstock. Here we present an electrochemical redox conversion of formate to CO through the potential-dependent generation of carbon dioxide radical anions (CO2 ⋅- ) on Fe-Co layered double hydroxides (Fe-Co LDHs) and the subsequent reduction of CO2 ⋅- to CO on Au catalysts. We present an electrodeposition protocol for the synthesis of Fe-Co LDHs with precise composition control and find that Fe1 Co4 exhibits a promising potential window for CO2 ⋅- formation between 1.14 and 1.4 V and an optimized potential at 1.24 V at a neutral pH condition. We further determined the formation of CO2 ⋅- at 1.24 V via electron paramagnetic resonance and CO2 at >1.4 V through differential electrochemical mass spectrometry. This work provides a redox chemistry route for converting formate into CO through a coupled slit parallel-plate electrode system.
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Affiliation(s)
- Xia Zheng
- Molecular Electrochemistry Laboratory, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 611731, China
| | - Qianbao Wu
- Molecular Electrochemistry Laboratory, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 611731, China
| | - Mengjun Xiao
- Molecular Electrochemistry Laboratory, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 611731, China
| | - Lei Li
- Molecular Electrochemistry Laboratory, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 611731, China
| | - Ruijuan Zhao
- Molecular Electrochemistry Laboratory, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 611731, China
| | - Chunhua Cui
- Molecular Electrochemistry Laboratory, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 611731, China
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3
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Liu Z, Xue J, Li Y. Ultrathin PdCu Nanosheet as Bifunctional Electrocatalysts for Formate Oxidation Reaction and Oxygen Reduction Reaction. SMALL METHODS 2023:e2300021. [PMID: 36960934 DOI: 10.1002/smtd.202300021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 02/27/2023] [Indexed: 06/18/2023]
Abstract
The development of robust nonplatinum electrocatalysts to enhance the performance of formate oxidation reaction (FOR) and oxygen reduction reaction (ORR) is one of the key issues for the commercialization of direct formate fuel cells (DFFCs), but still challenging. Herein, a structurally controlled 3D flower-like PdCu nanosheet (NS) catalyst is synthesized by a method of oil bath reduction under mild conditions as a bifunctional electrocatalyst for DFFCs. Under the dual tuning on the composition and intermetallic phase, the PdCu nanosheet catalyst exhibits 8.67 times higher mass activity for anodic formate oxidation reaction than the commercial Pd/C. For the cathodic ORR, a positive shift half-wave potential is obtained for PdCu nanosheets exceeding Pt/C. Moreover, after a long-term stability test, the current density of the PdCu nanosheet catalyst for FOR and ORR can be well maintained with the least activity decay. When the PdCu NSs are used as optimized anode and cathode electrodes for DFFCs enable a peak power density as high as 53 mW cm-2 at room temperature, which is about 1.3 times higher than that of the commercial Pd/C and Pt/C as anode and cathode electrodes. This work provides a potential strategy to improve the catalytic performance of non-Pt-based nanocatalysts.
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Affiliation(s)
- Zhipeng Liu
- Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China
| | - Jinling Xue
- Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China
| | - Yinshi Li
- Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, 710049, China
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Karatok M, Ngan HT, Jia X, O'Connor CR, Boscoboinik JA, Stacchiola DJ, Sautet P, Madix RJ. Achieving Ultra-High Selectivity to Hydrogen Production from Formic Acid on Pd-Ag Alloys. J Am Chem Soc 2023; 145:5114-5124. [PMID: 36848504 DOI: 10.1021/jacs.2c11323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
Palladium-silver-based alloy catalysts have a great potential for CO-free hydrogen production from formic acid for fuel cell applications. However, the structural factors affecting the selectivity of formic acid decomposition are still debated. Herein, the decomposition pathways of formic acid on Pd-Ag alloys with different atomic configurations have been investigated to identify the alloy structures yielding high H2 selectively. Several PdxAg1-x surface alloys with various compositions were generated on a Pd(111) single crystal; their atomic distribution and electronic structure were determined by a combination of infrared reflection absorption spectroscopy (IRAS), X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT). It was established that the Ag atoms with Pd neighbors are electronically altered, and the degree of alteration correlates with the number of nearest Pd. Temperature-programmed reaction spectroscopy (TPRS) and DFT demonstrated that the electronically altered Ag domains create a new reaction pathway that selectively dehydrogenates formic acid. In contrast, Pd monomers surrounded by Ag are demonstrated to have a similar reactivity compared to pristine Pd(111), yielding CO and H2O in addition to the dehydrogenation products. However, they bind to the produced CO weaker than pristine Pd, demonstrating an enhancement in resistance to CO poisoning. This work therefore shows that surface Ag domains modified by interaction with subsurface Pd are the key active sites for selective decomposition of formic acid, while surface Pd atoms are detrimental to selectivity. Hence, the decomposition pathways can be tailored for CO-free H2 production on Pd-Ag alloy systems.
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Affiliation(s)
- Mustafa Karatok
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Hio Tong Ngan
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Xiwen Jia
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Christopher R O'Connor
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - J Anibal Boscoboinik
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Dario J Stacchiola
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Philippe Sautet
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States.,Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, California 90095, United States
| | - Robert J Madix
- School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
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Rosen AS, Vijay S, Persson KA. Free-atom-like d states beyond the dilute limit of single-atom alloys. Chem Sci 2023; 14:1503-1511. [PMID: 36794204 PMCID: PMC9906637 DOI: 10.1039/d2sc05772g] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Accepted: 01/13/2023] [Indexed: 01/21/2023] Open
Abstract
Through a data-mining and high-throughput density functional theory approach, we identify a diverse range of metallic compounds that are predicted to have transition metals with "free-atom-like" d states that are highly localized in terms of their energetic distribution. Design principles that favor the formation of localized d states are uncovered, among which we note that site isolation is often necessary but that the dilute limit, as in most single-atom alloys, is not a pre-requisite. Additionally, the majority of localized d state transition metals identified from the computational screening study exhibit partial anionic character due to charge transfer from neighboring metal species. Using CO as a representative probe molecule, we show that localized d states for Rh, Ir, Pd, and Pt tend to reduce the binding strength of CO compared to their pure elemental analogues, whereas this does not occur as consistently for the Cu binding sites. These trends are rationalized through the d-band model, which suggests that the significantly reduced d-band width results in an increased orthogonalization energy penalty upon CO chemisorption. With the multitude of inorganic solids that are predicted to have highly localized d states, the results of the screening study are likely to result in new avenues for heterogeneous catalyst design from an electronic structure perspective.
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Affiliation(s)
- Andrew S. Rosen
- Department of Materials Science and Engineering, University of California, BerkeleyBerkeleyCalifornia94720USA,Miller Institute for Basic Research in Science, University of California, BerkeleyBerkeleyCalifornia 94720USA,Materials Science Division, Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720USA
| | - Sudarshan Vijay
- Department of Materials Science and Engineering, University of California, BerkeleyBerkeleyCalifornia94720USA,Materials Science Division, Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720USA
| | - Kristin A. Persson
- Department of Materials Science and Engineering, University of California, BerkeleyBerkeleyCalifornia94720USA,Molecular Foundry, Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720USA
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6
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Chen Z, Zhang P. Electronic Structure of Single-Atom Alloys and Its Impact on The Catalytic Activities. ACS OMEGA 2022; 7:1585-1594. [PMID: 35071854 PMCID: PMC8771685 DOI: 10.1021/acsomega.1c06067] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Accepted: 12/24/2021] [Indexed: 06/14/2023]
Abstract
Single-atom alloys (SAAs) are promising materials for heterogeneous catalysis due to their unique structure and electronic properties. SAAs have active sites narrowed down to the single-atom level, which combines the advantages of alloy materials and single-site catalysts. Given the unique structural feature of SAAs, their electronic properties can be more flexibly tailored than for their monometallic counterparts, which can be used to effectively control their catalytic activities. One interesting feature commonly observed for SAAs is the lower density of state (DOS) near the Fermi level than their bulk references. Comparing with results for their monometallic bulk reference, the most noticeable electronic property change in SAAs is the narrowing of the valence band, which gives them free-atom-like character. Moreover, the d-band position of both single atoms and their host metals can show a pronounced shift. These changes of electronic structure in SAAs could largely affect the adsorption behavior of adsorbates during the catalytic processes. Close examination of the relationship between electronic structure and catalytic activity can provide useful guidance for rational design of new catalysts with improved performance.
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Ershov V, Tarasova N, Ershov B. Evolution of Electronic State and Properties of Silver Nanoparticles during Their Formation in Aqueous Solution. Int J Mol Sci 2021; 22:ijms221910673. [PMID: 34639013 PMCID: PMC8509023 DOI: 10.3390/ijms221910673] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 09/22/2021] [Accepted: 09/27/2021] [Indexed: 12/22/2022] Open
Abstract
The electron density of a nanoparticle is a very important characteristic of the properties of a material. This paper describes the formation of silver nanoparticles (NPs) and the variation in the electronic state of an NP's surface upon the reduction in Ag+ ions with oxalate ions, induced by UV irradiation. The calculations were based on optical spectrophotometry data. The NPs were characterized using Transmission electron microscopy and Dynamic light scattering. As ~10 nm nanoparticles are formed, the localized surface plasmon resonance (LSPR) band increases in intensity, decreases in width, and shifts to the UV region from 402 to 383 nm. The interband transitions (IBT) band (≤250 nm) increases in intensity, with the band shape and position remaining unchanged. The change in the shape and position of the LSPR band of silver nanoparticles in the course of their formation is attributable to an increasing concentration of free electrons in the particles as a result of a reduction in Ag+ ions on the surface and electron injection by CO2- radicals. The ζ-potential of colloids increases with an increase in electron density in silver nuclei. A quantitative relationship between this shift and electron density on the surface was derived on the basis of the Mie-Drude theory. The observed blue shift (19 nm) corresponds to an approximately 10% increase in the concentration of electrons in silver nanoparticles.
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Affiliation(s)
- Vadim Ershov
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071 Moscow, Russia;
| | - Natalia Tarasova
- Institute of Chemistry and Problems of Sustainable Development, Dmitry Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia;
| | - Boris Ershov
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119071 Moscow, Russia;
- Correspondence:
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Li Z, Chen F, Bian W, Kou B, Wang Q, Guo L, Jin T, Tang Q, Pan B. Surface Pourbaix diagram of AgPd nanoalloys and its application in formate oxidation reaction. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138465] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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9
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Gebremariam TT, Chen F, Kou B, Guo L, Pan B, Wang Q, Li Z, Bian W. PdAgRu nanoparticles on polybenzimidazole wrapped CNTs for electrocatalytic formate oxidation. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.136678] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Jin Y, Chen F, Guo L, Wang J, Kou B, Jin T, Liu H. Engineering Two-Dimensional PdAgRh Nanoalloys by Surface Reconstruction for Highly Active and Stable Formate Oxidation Electrocatalysis. ACS APPLIED MATERIALS & INTERFACES 2020; 12:26694-26703. [PMID: 32418422 DOI: 10.1021/acsami.0c05929] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Promoting the formate oxidation reaction (FOR) is central to develop promising direct formate fuel cells, but current electrocatalysts are suffering from low activity and ultrapoor stability. Herein, the ternary PdAgRh nanoalloys with ultrathin two-dimensional architecture are for the first time synthesized and employed as a novel class of electrocatalysts for the FOR. Benefitting from unique nanostructure as well as oxophilic Rh surface oxides, the Pd55Ag30Rh15/C electrocatalyst demonstrates an exceptional FOR activity of 1.85 A mgPd-1, showing a 4.74-fold improvement compared to the commercial Pd/C, and retains the current density of 150 mA mgPd-1 after a long-term test, representing the greatest durability among all available FOR electrocatalysts. More strikingly, extending the upper limit potential (ULP) of cyclic voltammetry is revealed to facilitate the surface reconstruction of the Pd55Ag30Rh15/C electrocatalyst to in situ form Ag surface oxides (Ag-O), resulting in a highly active and stable Pd/Ag-O interface at the atomic scale, which considerably boost the FOR performance. In particular, the reconstructed Pd55Ag30Rh15/C electrocatalyst exhibits a mass activity of 3.26 A mgPd-1 with 74.2% of initial activity retained after 1000 cycles. This work showcases an effective strategy to tune surface reconstruction on multimetallic nanoalloys for robust FOR electrocatalysts and beyond.
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Affiliation(s)
- Yachao Jin
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
- 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
- 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
- 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
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
| | - Bo Kou
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
| | - Tao Jin
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
| | - Huazhen Liu
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
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11
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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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12
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Weng YC, Wu CC, Wang HJ, Wang YY. Screening and characterization of bimetallic Pt–M (M = Y, La, Ce, Pr, Nd, Gd) electrocatalysts for the oxygen reduction reaction. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.136012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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13
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Zhang N, Chen F, Jin Y, Wang J, Jin T, Kou B. Alloying effect in silver-based dilute nanoalloy catalysts for oxygen reduction reactions. J Catal 2020. [DOI: 10.1016/j.jcat.2020.02.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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14
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Guo L, Chen F, Jin T, Liu H, Zhang N, Jin Y, Wang Q, Tang Q, Pan B. Surface reconstruction of AgPd nanoalloy particles during the electrocatalytic formate oxidation reaction. NANOSCALE 2020; 12:3469-3481. [PMID: 31990278 DOI: 10.1039/c9nr09660d] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Formate is a kind of carbon-neutral fuel that can be synthesized by electrochemical conversion of CO2, however, the generated aqueous formate electrolyte is still short of potential application. Here, formate solution is proposed to be utilized as anode fuels of direct formate fuel cells through the formate oxidation reaction (FOR), and graphene supported AgPd nanoalloys (AgPd/rGO) are prepared to catalyze the FOR. Specifically, the mass activity of the as-prepared Ag49Pd51/rGO catalyst is 4.21 A mg-1Pd and the retention activity of Ag49Pd51/rGO is 49.1% of initial activity after successive 500 cycles, which is 2.48 and 3.03 times higher than that of unsupported Ag51Pd49 nanoalloys. When increasing the positive scan limit from 0.0 to 0.8 V, the mass activity of the Ag49Pd51/rGO catalyst increases from 2.32 to 6.03 A mg-1Pd and Pd surface coverage increases from 51.87% to 62.42%, indicating the occurrence of surface reconstruction where Pd atoms migrate to the surface of AgPd nanoalloys, and less intensive reconstruction is observed in unsupported Ag51Pd49 nanoalloys, whose mass activity increases from 1.35 to 2.49 A mg-1Pd. The driving force and kinetic path are calculated for the surface reconstruction induced by the adsorption of H, O and C atoms, in the case of C atoms on graphene, the segregation energy of surface Pd atoms in the AgPd nanoalloy is -1.16 eV, and the activation energy for the migration of subsurface Pd atoms to the surface is 0.54 eV, which are lower than the segregation (0.03 eV) and activation (2.06 eV) energy on a clean alloy surface.
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Affiliation(s)
- 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
| | - 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
| | - Tao Jin
- 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
| | - Huazhen Liu
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, China
| | - Nan Zhang
- 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. 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
| | - 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
| | - Bowei Pan
- School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, 710072, China
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Nanostructured silver dendrites for photon-induced Cysteine dimerization. Sci Rep 2019; 9:20174. [PMID: 31882825 PMCID: PMC6934660 DOI: 10.1038/s41598-019-56517-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Accepted: 12/06/2019] [Indexed: 12/31/2022] Open
Abstract
Under a controlled adsorption environment, L-cysteine molecules can be chemically adsorbed to the dendritic silver (Ag-D) surface by electrochemical methods with different functional groups. It is verified by surface-enhanced Raman spectroscopy that under alkaline conditions (pH = 13.50), the two functional groups of thiol and acid are simultaneously adsorbed on the surface of Ag-D, while NH2 is far from the surface; under acidic conditions (pH = 1.67), adsorption behavior suggests that both NH3+ and COO− are oriented toward the Ag-D surface, and that SH is far from the surface. The structure of L-cysteine adsorption under acidic conditions can be further verified by the addition of an L-cysteine molecule through light-induced coupling reaction to form cystine. Finally, in-situ two-dimensional Raman scattering spectroscopy confirmed the feasibility and uniformity of the coupling reaction.
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Sun Y, Li Y, Qin Y, Wang L, Guo S. Interfacial Engineering in PtNiCo/NiCoS Nanowires for Enhanced Electrocatalysis and Electroanalysis. Chemistry 2019; 26:4032-4038. [PMID: 31769895 DOI: 10.1002/chem.201904473] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Revised: 11/23/2019] [Indexed: 01/30/2023]
Abstract
Searching for new anti-poisoning Pt-based catalysts with enhanced activity for alcohol oxidation is the key in direct alcohol fuel cells (DAFCs). However, in the traditional strategy for designing bimetallic or multimetallic alloy is still difficult to achieve a satisfactory heterogeneous electrocatalyst because the activity often depends on only the surface atoms. Herein, we fabricate the multicomponent active sites by creating a sulfide structure on 1D PtNiCo trimetallic nanowires (NWs), to give a PtNiCo/NiCoS interface NWs (IFNWs). Owing to the presence of sulfide interfaces, the PtNiCo/NiCoS IFNWs enable an impressive methanol/ethanol oxidation reaction (MOR/EOR) performance and excellent anti-CO poisoning tolerance. They have the MOR and EOR mass activities of 2.25 Amg-1 Pt and 1.62 Amg-1 Pt , around 1.26, 3.21 and 1.46, 2.96 times higher than those of PtNiCo NWs and commercial Pt/C, respectively. CO-stripping and XPS measurements further demonstrate that the new interfacial structure and optimal bonding of Pt-CO can result in accelerating the removal of surface adsorbed carbonaceous intermediates. Moreover, such a unique structure has also demonstrated a much-improved ability for the electrochemical detection of some important molecules (H2 O2 and NH2 NH2 ).
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Affiliation(s)
- Yingjun Sun
- Key Laboratory of Eco-Chemical Engineering, Taishan Scholar Advantage and Characteristic Discipline Team of Eco Chemical Process and Technology, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, P. R. China.,Department of Materials Science & Engineering, College of Engineering, Peking University, Beijing, 100871, P. R. China
| | - Yingjie Li
- Department of Materials Science & Engineering, College of Engineering, Peking University, Beijing, 100871, P. R. China
| | - Yingnan Qin
- Key Laboratory of Eco-Chemical Engineering, Taishan Scholar Advantage and Characteristic Discipline Team of Eco Chemical Process and Technology, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, P. R. China.,Department of Materials Science & Engineering, College of Engineering, Peking University, Beijing, 100871, P. R. China
| | - Lei Wang
- Key Laboratory of Eco-Chemical Engineering, Taishan Scholar Advantage and Characteristic Discipline Team of Eco Chemical Process and Technology, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, P. R. China
| | - Shaojun Guo
- Department of Materials Science & Engineering, College of Engineering, Peking University, Beijing, 100871, P. R. China.,BIC-ESAT, College of Engineering, Peking University, Beijing, 100871, P. R. China
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