SANTIAGO, ELISABETE I.VARANDA, LAUDEMIR C.VILLULLAS, H.M.2014-07-152014-07-302014-07-152014-07-302007SANTIAGO, ELISABETE I.; VARANDA, LAUDEMIR C.; VILLULLAS, H.M. Carbon-supported Pt-Co catalysts prepared by a modified polyol process as cathodes for PEN fuel cells. <b>Journal of Physical Chemistry, C</b>, v. 111, p. 3146-3155, 2007. DOI: <a href="https://dx.doi.org/10.1021/jp0670081">10.1021/jp0670081</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/5186.1932-7447http://repositorio.ipen.br/handle/123456789/5186In 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 °C) was also evaluated and an increase of average crystallite size and a lower degree of alloying, probably associated to cobalt oxidation, were evidenced.3146-3155closedAccessproton exchange membrane fuel cellscarbonplatinumcobaltcathodeselectrocatalystsArtigo de periódico11110.1021/jp0670081https://orcid.org/0000-0002-5972-5933