Abstract
Functional nanoporous metals and alloys can be fabricated by chemical or electrochemical dealloying routes in corrosive media, followed by customized surface functionalization. The present work describes how a combination of displacement reaction and dealloying can provide a facile one-pot procedure to nanoporous alloys such as PtAu, and the resulted electrocatalysts are characterized by highly dispersed Pt atoms or small clusters embedded within a high surface area Au matrix. These dilute alloy electrocatalysts with low Pt contents exhibit remarkable activity toward formic acid oxidation via a favorable dehydrogenation mechanism. At 0.6 V versus reversible hydrogen electrode, they can demonstrate over 70-fold enhancement in Pt mass activity than that of the commercial Pt/C.
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