Preparation And Study Of Catalyst With Ordered Mesoporous Carbon As Support For PEMFC

Highly dispersed Pt/C electrocatalysts with high performance are known to be efficient electrocatalytic material in Proton Exchange Membrane Fuel Cell (PEMFC). At the same time, mesoporous carbon, as a novel nanostructured carbon, has been attractived as new supports of electrocatalyst for fuel cell. This paper presented a detail study of mesoporous carbon prepared using mesoporous silica template SBA-15. Pt and alloy catalysts supported on mesoprous carbon were prepared by microwave synthesis and the impregnation-reduction method.This thesis developed a cationic surfactant CTAB as stabilizer in the process of microwave heating. The wetness of carbon support was improved and Pt precursor solution was easily and homogeneously absorbed on the carbon support because of CTAB. As a result, the reaction sites were increased and the corresponding particle sizes of Pt became smaller. The results of XRD, TEM and CV curves demonstrated that the dispersion of Pt nanoparticles were improved and the particle size of the catalyst was decreased to 2.9 nm after heat-treated at 350°C under N2 atmosphere for 2 h after addition of CTAB. Electrochemical active area of catalyst found that Pt catalyst displayed better hydrogen electrochemical oxidation activity than the commercial Pt/C(E-TEK) catalyst, using CTAB as stabilizer in the process of microwave synthesis.This paper has also studied the impregnation-reduction method for perpareing Pt and Pt-Ni alloy electrocatalysts supported mesoporous carbon. The catalysts were characterized by XRD, TEM and CV. The results showed that the electrochemical performance is best when the atomic ratio of Pt to Ni is 5:1.In order to lower the cost, this paper has studied the influence of different carbon precursor on catalysts, such as sucrose and formaldehyde-resorcinol resin. The different catalyst supported on mesoporous carbon has been successfully prepared by microwave heated method. The particle size and the dispersion degree of Pt supported on carbon were observed by TEM. The electrochemical activity was characterized by CV curves. The results showed that the performance of Pt/C-0 electrocatalyst is best between them.