Gold-promoted structurally ordered intermetallic palladium cobalt nanoparticles for the oxygen reduction reaction

Kurian A. Kuttiyiel, Kotaro Sasaki (), Dong Su, Lijun Wu, Yimei Zhu and Radoslav R. Adzic ()
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Kurian A. Kuttiyiel: Brookhaven National Laboratory
Kotaro Sasaki: Brookhaven National Laboratory
Dong Su: Center for Functional Nanomaterials, Brookhaven National Laboratory
Lijun Wu: Brookhaven National Laboratory
Yimei Zhu: Brookhaven National Laboratory
Radoslav R. Adzic: Brookhaven National Laboratory

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Considerable efforts to make palladium and palladium alloys active catalysts and a possible replacement for platinum have had a marginal success. Here we report on a structurally ordered Au10Pd40Co50 catalyst that exhibits comparable activity to conventional platinum catalysts in both acid and alkaline media. Electron microscopic techniques demonstrate that, at elevated temperatures, palladium cobalt nanoparticles undergo an atomic structural transition from core-shell to a rare intermetallic ordered structure with twin boundaries forming stable {111}, {110} and {100} facets via addition of gold atoms. The superior stability of this catalyst compared with platinum after 10,000 potential cycles in alkaline media is attributed to the atomic structural order of PdCo nanoparticles along with protective effect of clusters of gold atoms on the surface. This strategy of making ordered palladium intermetallic alloy nanoparticles can be used in diverse heterogeneous catalysis where particle size and structural stability matter.

Date: 2014
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DOI: 10.1038/ncomms6185

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