Journal
ELECTROCHIMICA ACTA
Volume 353, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.136616
Keywords
Metallic glass; Fuel cell; Electrocatalyst; Density functional theory; Scanning electrochemical microscopy
Categories
Funding
- National Science Foundation (NSF) [1561886, 1919220, 1762545]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1762545] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Industrial Innovation & Partnersh [1919220] Funding Source: National Science Foundation
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Noble-metal based metallic glasses have recently shown excellent performance towards a range of catalytic reactions, which is attributed to their disordered atomic structure and high density of active sites on the surface. An in-depth understanding of the mechanisms that promote the catalytic perfor-mance of amorphous alloys would facilitate the design and development of highly efficient catalysts with significantly lower precious metal loading. In the present study, the electro-catalytic behavior of amorphous Pt-and Pd-based metallic glasses was studied towards hydrogen oxidation reaction by cyclic voltammetry and scanning electrochemical microscopy. The electrochemically active surface area for the metallic glasses was found to be several folds higher compared to pure Pt and Pd. Density functional theory calculations showed that hydrogen oxidation on the surface of the amorphous alloys preferen-tially followed the reverse Heyrovsky-Volmer pathway. The minimum over-potential for the amorphous alloys was calculated to be significantly lower compared to pure Pt and Pd, consistent with the exper-imental trends. The enhanced catalytic activity for the amorphous alloys was attributed to the reduced chemisorption of hydrogen on the metallic glass surface, particularly for the alloys containing both Pt and Pd. (C) 2020 Elsevier Ltd. All rights reserved.
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