Abstract

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 O 2 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.

Keywords

PlatinumOxidizing agentDissolutionCatalysisCyclic voltammetryOxygen reductionElectrochemistryChemistryOxygenInorganic chemistryCyclingVoltammetryMaterials scienceChemical engineeringElectrodePhysical chemistry

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Publication Info

Year
2007
Type
article
Volume
315
Issue
5809
Pages
220-222
Citations
1767
Access
Closed

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Cite This

Junliang Zhang, Kotaro Sasaki, Eli Sutter et al. (2007). Stabilization of Platinum Oxygen-Reduction Electrocatalysts Using Gold Clusters. Science , 315 (5809) , 220-222. https://doi.org/10.1126/science.1134569

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DOI
10.1126/science.1134569