研究期間：10108~10207;In this project, TiO2 or TiC supported PdAu core/Pt shell or PdCo core/Pt shell (PdAu@Pt or PdCo@Pt) structure toward oxygen reduction reaction (ORR) will be prepared as the cathode catalysts for proton exchange membrane fuel cell. Because of the carbon corrosion and accordingly the decrease of the stability and durability of the catalysts during long-term test, the Ti-based support will be developed. Besides, Pt-based core/shell catalysts have some advantages such as the reduction of Pt content and the modification of core-shell interaction to different extent, which can further enhance their ORR activity. Therefore, in this project, the structure-surface-activity relationship of Ti-supported Pd-based alloy core/Pt shell structure will be investigated. The addition of Au can promote the stability and modify the oxophilicity of Pt catalysts while alloying of Co can reduce the Pt content and make the catalysts cost-effective. In phase one, successive reduction and under potential deposition methods will be applied to prepare the PdAu@Pt/C and PdCo@Pt/C catalysts. In phase two, TiO2 or TiC will be used as supports to prepared Pt catalysts with excellent ORR activity and stability (the Pt mass activity at 0.9 V will be larger than 0.3 A/mg and the activity loss at 0.85 V will be less than 40 % after 1000 cycles by the accelerated durability test). In phase three, PdAu@Pt/TiOx(TiC) or PdCo@Pt/TiOx(TiC) catalysts will be prepared and tested in the fuel cell test station. It is expected that the highly-effective cathode catalysts and MEA with the current density at 0.6 V about 1.25 A/cm2 and the maximum power density about 0.90 W/cm2 can be obtained, respectively. Besides, some models will be proposed to get insight into the preparation process for structure and surface tailored PdAu@Pt and PdCo@Pt core-shell structure on the theory of materials science. For the industrial applications, the preparation of novel catalysts can help the commercialization of fuel cells. The experimental results will make some contributions to the field of materials science, surface chemistry, catalysis and fuel cells.
