Résumé
Nanofibre antimony and niobium doped tin oxides (Sb-SnO2, Nb-SnO2) were prepared by electrospinning and calcination, and were functionalised by depositing platinum nanoparticles prepared by a microwave-assisted polyol method. Catalysts inks of Pt/Sb-SnO2 and Pt/Nb-SnO2 were used to prepare cathodes that were assembled with a commercial anode and membrane into MEAs. These MEAs were submitted to voltage cycling between 0.9 and 1.5 V, and to stop/start cycling. I-V characteristics recorded at the beginning and end of the accelerated stress test protocols. The relative stability of Pt/Sb-SnO2, Pt/Nb-SnO2 under these conditions, and the results of probe spectroscopic methods used to investigate ageing mechanisms in doped tin oxides, will be described.