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Pt5Gd as a Highly Active and Stable Catalyst for Oxygen Electroreduction

Authors :
Jan Rossmeisl
Ifan E. L. Stephens
Ulrik Grønbjerg
Brian P. Knudsen
Ib Chorkendorff
María Escudero-Escribano
Arnau Verdaguer-Casadevall
Anders K. Jepsen
Paolo Malacrida
Source :
Journal of the American Chemical Society. 134:16476-16479
Publication Year :
2012
Publisher :
American Chemical Society (ACS), 2012.

Abstract

The activity and stability of Pt(5)Gd for the oxygen reduction reaction (ORR) have been studied, using a combination of electrochemical measurements, angle-resolved X-ray photoelectron spectroscopy (AR-XPS), and density functional theory calculations. Sputter-cleaned, polycrystalline Pt(5)Gd shows a 5-fold increase in ORR activity, relative to pure Pt at 0.9 V, approaching the most active in the literature for catalysts prepared in this way. AR-XPS profiles after electrochemical measurements in 0.1 M HClO(4) show the formation of a thick Pt overlayer on the bulk Pt(5)Gd, and the enhanced ORR activity can be explained by means of compressive strain effects. Furthermore, these novel bimetallic electrocatalysts are highly stable, which, in combination with their enhanced activity, makes them very promising for the development of new cathode catalysts for fuel cells.

Details

ISSN :
15205126 and 00027863
Volume :
134
Database :
OpenAIRE
Journal :
Journal of the American Chemical Society
Accession number :
edsair.doi.dedup.....3d787487c39ed587c5d73eb302ce959f
Full Text :
https://doi.org/10.1021/ja306348d