Effect of thermal treatment on the performance of CO-tolerant anodes for polymer electrolyte fuel cells

In this work, carbon-supported Pt:Ru electrocatalysts, mainly for applicati on in polymer electrolyte fuel cells, have been prepared by different metho ds. The materials were tested in single cells with respect to the hydrogen- oxidation reaction in the presence of CO, and the performances, before and after thermal treatments, compared to that of state-of-the-art, commercial E-TEK catalysts. In most cases, it was found that the performance of the an ode improves substantially after the thermal treatment of the material. Of the several methods considered, the preparation of the catalyst via the for mation of a sulfite complex, followed by a thermal treatment, gave the best results, comparable to those obtained with the state-of-the-art catalyst. (C) 2000 Elsevier Science S.A. All rights reserved.