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Science 12 January 2007:
Vol. 315. no. 5809, pp. 220 - 222
DOI: 10.1126/science.1134569
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Reports

Stabilization of Platinum Oxygen-Reduction Electrocatalysts Using Gold Clusters

J. Zhang,1 K. Sasaki,1 E. Sutter,2 R. R. Adzic1

We demonstrated that platinum (Pt) oxygen-reduction fuel-cell electrocatalysts can be stabilized against dissolution under potential cycling regimes (a continuing problem in vehicle applications) by modifying Pt nanoparticles with gold (Au) clusters. This behavior was observed under the oxidizing conditions of the O2 reduction reaction and potential cycling between 0.6 and 1.1 volts in over 30,000 cycles. There were insignificant changes in the activity and surface area of Au-modified Pt over the course of cycling, in contrast to sizable losses observed with the pure Pt catalyst under the same conditions. In situ x-ray absorption near-edge spectroscopy and voltammetry data suggest that the Au clusters confer stability by raising the Pt oxidation potential.

1 Department of Chemistry, Brookhaven National Laboratory, Upton, NY 11973, USA.
2 Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USA.

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