New Oxide Catalyst Support Generation for PEFC - Application in Meas, Performance and Stability Issues
Up to date, the literature reports stability studies for new oxide catalyst supports but the degradation protocols are realised at the laboratory level (typically room temperature, high potential range, non-optimised catalytic layer) . Only few data are available regarding the processing of these new alternative supports for Pt in a PEFC and their stability under real working conditions of the derived MEAs.
For this purpose Pt/IrTiO2 and Pt/Sb-doped SnO2 (SbSnO2) catalysts were studied. Pt/IrTiO2 provided by Umicore® was used as a model catalyst, whereas Pt/SbSnO2 catalyst was synthesized in our laboratories. For this purpose, a SbSnO2 powder was first synthesized by a modified sol-gel method. Platinum nanoparticles obtained by the polyol method  were further deposited on this oxide support. Different cathodes were prepared by direct spraying of optimised suspensions of Pt/IrTiO2 and Pt/SbSnO2 catalyst nanoparticles on a Nafion® XL-100 membrane.
The fuel cell performances and stabilities of the various membrane-electrode assemblies are examined in details. The results are compared with the MEAs based on the state of the art Pt/C (46%wt on High surface area carbon, Tanaka) catalyst and prepared by the same spraying procedure.
The authors thank Umicore AG & Co KG and the Competence Center for Energy and Mobility (CCEM) Switzerland for their financial support within the project DuraCat.
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