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Nat Commun. 2012;3:1115. doi: 10.1038/ncomms2124.

Highly stable Pt monolayer on PdAu nanoparticle electrocatalysts for the oxygen reduction reaction.

Author information

1
Chemistry Department, Brookhaven National Laboratory, Building 555, Upton, New York 11973-5000, USA. ksasaki@bnl.gov

Abstract

Stability is one of the main requirements for commercializing fuel cell electrocatalysts for automotive applications. Platinum is the best-known catalyst for oxygen reduction in cathodes, but it undergoes dissolution during potential changes while driving electric vehicles, thus hampering commercial adoption. Here we report a new class of highly stable, active electrocatalysts comprising platinum monolayers on palladium-gold alloy nanoparticles. In fuel-cell tests, this electrocatalyst with its ultra-low platinum content showed minimal degradation in activity over 100,000 cycles between potentials 0.6 and 1.0 V. Under more severe conditions with a potential range of 0.6-1.4 V, again we registered no marked losses in platinum and gold despite the dissolution of palladium. These data coupled with theoretical analyses demonstrated that adding a small amount of gold to palladium and forming highly uniform nanoparticle cores make the platinum monolayer electrocatalyst significantly tolerant and very promising for the automotive application of fuel cells.

PMID:
23047673
DOI:
10.1038/ncomms2124
[Indexed for MEDLINE]

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