期刊
ADVANCED FUNCTIONAL MATERIALS
卷 23, 期 33, 页码 4156-4162出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201300114
关键词
dealloying; bimetallic catalysts; nanoporous metals; catalysis; fuel cells
类别
资金
- JST-CREST Phase Interface Science for Highly Efficient Energy Utilization, JST, Japan
- World Premier International (WPI) Research Center Initiative for Atoms, Molecules and Materials, MEXT, Japan
- JST-PRESTO
Composition-controlled fabrication of bimetallic catalysts is of significance in electrochemical energy conversion and storage. A novel nanoporous Pt-Cu bimetallic catalyst with a Pt skin and a Pt-Cu core, fabricated by electrochemically dealloying a bulk Pt-Cu binary alloy using a potential-controlled approach, is reported. The Pt/Cu ratio of the dealloyed nanoporous catalyst can be readily adjusted in a wide composition range by only controlling dealloying potential. The electro-catalytic performance of the nanoporous Pt-Cu catalyst shows evident dependence on Pt/Cu ratio although the surfaces of all the nanoporous catalysts are characterized to be covered by pure Pt. With optimal compositions, the dealloyed nanoporous Pt-Cu catalyst possesses enhanced electrocatalytic activities toward oxygen reduction reaction and formic acid oxidation in comparison with the commercial Pt/C catalyst.
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