The Extent on the Nanoscale of Pt-Skin Effects on Oxygen Reduction and Its Influence on Fuel Cell Power
Nenhuma Miniatura disponível
Data
2010-12-02
Autores
Malheiro, Arthur R. [UNESP]
Perez, Joelma [UNESP]
Santiago, Elisabete I.
Villullas, Hebe de Las Mercedes [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Amer Chemical Soc
Resumo
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.
Descrição
Palavras-chave
Como citar
Journal of Physical Chemistry C. Washington: Amer Chemical Soc, v. 114, n. 47, p. 20267-20271, 2010.