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Advances in Physical Chemistry
Volume 2011 (2011), Article ID 530397, 16 pages
http://dx.doi.org/10.1155/2011/530397
Review Article

Platinum Monolayer Electrocatalysts for the Oxygen Reduction Reaction: Improvements Induced by Surface and Subsurface Modifications of Cores

Department of Chemistry, Brookhaven National Laboratory, Upton, NY 11973, USA

Received 18 May 2011; Accepted 22 August 2011

Academic Editor: Wolfgang Schmickler

Copyright © 2011 Yun Cai and Radoslav R. Adzic. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper demonstrates that the ORR activity of PtML electrocatalysts can be further improved by the modification of surface and subsurface of the core materials. The removal of surface low-coordination sites, generation (via addition or segregation) of an interlayer between PtML and the core, or the introduction of a second metal component to the subsurface layer of the core can further improve the ORR activity and/or stability of PtML electrocatalysts. These modifications generate the alternation of the interactions between the substrate and the PtML, involving the changes on both electronic (ligand) and geometric (strain) properties of the substrates. The improvements resulted from the application of these approaches provide a new perspective to designing of the new generation PtML electrocatalysts.