Carbon-supported Pt-Co catalysts prepared by a modifled polyol process as cathodes for PEM fuel cells


Autoria(s): Santiago, Elisabete I.; Varanda, Laudemir C.; Villullas, H. Mercedes
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

20/05/2014

20/05/2014

22/02/2007

Resumo

In this work, carbon-supported Pt70Co30 nanoparticles were prepared by a polyol process using a long-chain diol as reducer (hexadecanediol) and oleic acid and oleylamine as stabilizers. Depending on the synthesis conditions, Pt70Co30/C nanocatalysts with very small particle size (1.9 +/- 0.2 nm) and narrow distribution homogeneously dispersed on the carbon support and having a high degree of alloying without the need of thermal treatments were obtained. The as-prepared catalyst presents an excellent performance as proton exchange membrane fuel cells (PEMFC) cathode material. In terms of mass activity (MA), the Pt70Co30/C electrocatalysts produced single fuel cell polarization response superior to that of commercial catalyst. To analyze alloying effects, the result of thermal treatment at low temperatures (200-400 degrees C) was also evaluated and an increase of average crystallite size and a lower degree of alloying, probably associated to cobalt oxidation, were evidenced.

Formato

3146-3151

Identificador

http://dx.doi.org/10.1021/jp0670081

Journal of Physical Chemistry C. Washington: Amer Chemical Soc, v. 111, n. 7, p. 3146-3151, 2007.

1932-7447

http://hdl.handle.net/11449/25419

10.1021/jp0670081

WOS:000245005800043

Idioma(s)

eng

Publicador

Amer Chemical Soc

Relação

Journal of Physical Chemistry C

Direitos

closedAccess

Tipo

info:eu-repo/semantics/article