期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 58, 期 44, 页码 15848-15854出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201907322
关键词
dynamic oxygen-bubble template; facet selectivity; low Pt loading; oxygen reduction; porous films
资金
- National Science Foundation [CMMI-1851674]
- University of Central Florida
- NSF MRI [XPS: ECCS: 1726636]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Early Career Research Program [68278]
- Office of Biological and Environmental Research and located at the Pacific Northwest National Laboratory
To produce efficient ORR catalysts with low Pt content, PtNi porous films (PFs) with sufficiently exposed Pt active sites were designed by an approach combining electrochemical bottom-up (electrodeposition) and top-down (anodization) processes. The dynamic oxygen-bubble template (DOBT) programmably controlled by a square-wave potential was used to tune the catalyst morphology and expose Pt active facets in PtNi PFs. Surface-bounded species, such as hydroxyl (OH*, *=surface site) on the exposed PtNi PFs surfaces were adjusted by the applied anodic voltage, further affecting the dynamic oxygen (O-2) bubbles adsorption on Pt. As a result, PtNi PF with enriched Pt(111) facets (denoted as Pt3.5 %Ni PF) was obtained, showing prominent ORR activity with an onset potential of 0.92 V (vs. RHE) at an ultra-low Pt loading (0.015 mg cm(-2)).
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