Preparation And Electrochemical Performance Of Platinum Based Catalysts For Methanol Electrooxidation

Recently developed direct methanol fuel cell (DMFC) has been received widespread attention due to the abundant source, the safety of the storage and transportation of the fuel. Nevertheless, the step toward the practical application has not been developed as fast as had been expected. Mainly, there are some problems, such as low electrocatalytic activity of the anodic catalyst, the poisoning of the anode catalysts by the adsorbed carbonyl species derived from methanol oxidation, methanol permeation from anode to cathode and demand for methanol-tolerant oxygen reduction catalyst. A significant enhancement of electrocatalytic activities for the 6-electron transfer electro-oxidation of methanol has been, and still is, thought as the most challenging problem for the development of DMFC.In order to improving the CO-tolerant capability and enhancing the electrocatalytic activity of anode catalyst for methanol oxidation, in this thesis, the microwave heated polyol synthesis method is used to prepare series PtMox/C catalysts. Effects of microwave-synthesis and impregnation method on the microstructure and the electro-catalytic activity of catalysts have been comparatively studied. In addition, the effects of atom ratio of Pt and Mo on the crystal structure, the CO tolerance of PtMox/C catalysts and the electrocatalytic activity for methanol electro-oxidation have been systematically investigated. The results showed that, microwave-synthesis is more beneficial to obtain the highly dispersed catalyst and to improve the electrocatalytic activity of the catalyst; the crystal of PtMox/C is always exhibited to the fcc structure even though the addition of Mo can slightly change the crystal parameters of Pt/C catalyst. Among the PtMox/C catalysts,...