Journal
CATALYSIS TODAY
Volume 202, Issue -, Pages 50-54Publisher
ELSEVIER
DOI: 10.1016/j.cattod.2012.03.040
Keywords
Pt monolayer; Hollow nanoparticle; Oxygen reduction catalyst; Fuel cell; Galvanic replacement; Kirkendall effect
Funding
- U.S. Department of Energy, Divisions of Chemical and Material Sciences [DE-AC02-98CH10886]
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We synthesized high-activity electrocatalysts for the oxygen reduction reaction comprising a Pt monolayer shell on compact hollow nanoparticles. Pulse electrodeposited Ni nanoparticles were replaced galvanically by Pd and Pd-Au ions to obtain corresponding hollow nanoparticles. Pt monolayer catalysts supported on such hollow cores exhibited total-metal mass activities ranging from 0.41 to 0.57 A mg(-1), doubling that of 0.25 A mg(-1) for Pt monolayer catalysts on solid Pd cores. We attribute this enhanced activity to the smooth surface morphology and hollow-induced lattice contraction, in addition to the mass-saving geometry of hollow particles. (C) 2012 Elsevier B.V. All rights reserved.
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