Artículos de revistas
The Extent on the Nanoscale of Pt-Skin Effects on Oxygen Reduction and Its Influence on Fuel Cell Power
Fecha
2010-12-02Registro en:
Journal of Physical Chemistry C. Washington: Amer Chemical Soc, v. 114, n. 47, p. 20267-20271, 2010.
1932-7447
10.1021/jp107054u
WOS:000284455200053
0967996519065806
Autor
Universidade Estadual Paulista (Unesp)
Instituto de Pesquisas Energéticas e Nucleares (IPEN)
Institución
Resumen
Carbon-supported PtFe nanoparticles having similar overall composition (3:1), crystallinity, and average particle diameter were prepared with and without a Pt-skin layer and used to evaluate the extent, on the nanometer scale, of Pt-skin effects on the activity for oxygen reduction. In this study, we show that when most of the relevant properties of the catalysts are kept alike, there is an increase of about 2-fold in the intrinsic activity for oxygen reduction that can be ascribed to Pt-skin effects. It is also demonstrated that the activity improvement produced by the presence of a Pt-skin surface is, however, insufficient to generate significant differences on the power density of a single proton exchange membrane fuel cell.