A Comparative Study of Variously Prepared Carbon-Supported Pt/MoO(x) Anode Catalysts for a Polymer Electrolyte Fuel Cell

作者：Muhamad Ernee Noryana^*; Takeguchi Tatsuya; Wang Feng; Wang Guoxiong; Yamanaka Toshiro; Ueda Wataru

来源：Journal of the Electrochemical Society, 2009, 156(11): B1361-B1368.

DOI：10.1149/1.3223970

Carbon-supported Pt/MoO(x) anode catalysts were prepared by the preimpregnation, postimpregnation, and chemical reduction methods. The physicochemical characteristics of all catalysts were determined by X-ray diffraction, scanning transmission electron microscopy, and CO pulse titration. The electrochemical oxidation of CO verified from CO-stripping voltammetry shows that most of the CO(ads) were oxidized on the Pt sites. The Pt/MoO(x)/C catalyst prepared by the chemical reduction method showed superior hydrogen electrochemical oxidation in pure H(2), apparently due to the much smaller Pt particle size than those of the other Pt/MoO(x)/C catalysts. However, the anode performances in the presence of 500 ppm CO/H(2) mixture showed that a catalyst with high CO tolerance was derived from the Pt/MoO(x)/C catalyst prepared by postimpregnation method. The oxidation of CO by the water-gas shift (WGS) reaction is shown by the formation of CO(2) even under an open-circuit condition. With an increase in current, active sites for the WGS reaction is regenerated by electrochemical oxidation of hydrogen.

• 出版日期2009