期刊
ACS CATALYSIS
卷 3, 期 6, 页码 1220-1230出版社
AMER CHEMICAL SOC
DOI: 10.1021/cs400135k
关键词
nanoporous alloy; dealloying; bimetallic catalysis; direct ethanol fuel cell; surface electronic structure; Pd-Au catalyst
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
We report nanoporous Pd100-xAux (x = 0, 25, 50, 75, 100; np-PdAu) bimetallic catalysts fabricated by electrochemically dealloying isomorphous Pd20-yAuyNi80 = 0, 5, 15, 20) precursors. The chemical composition of the nanoporous bimetallic catalysts can be precisely controlled by predesigning Pd/Au ratios in the ternary alloys. Dealloying at an appropriate potential for each alloy can selectively leach Ni away while the Pd and Au remain intact to form a geometrically controllable nanoporous structure. The electrocatalysis of the np-PdAu shows evident dependence on the Au/Pd atomic ratio, and the np-Pd75Au25 bimetallic catalyst shows superior electrocatalytic performance toward ethanol electrooxidation in comparison with commercial Pt/C, np-Pd, and other np-PdAu alloys. Since there are no obvious geometric shape and pore size disparities among the np-PdAu samples, the dealloyed catalysts also provide an ideal system to explore the chemical origins of the excellent catalytic properties of bimetallic catalysts.
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