寻找既具有高的甲醇电氧化催化活性、又具有强的抗CO中毒能力的阳极催化剂是当前DMFC研究工作者的迫切任务。在比较研究传统的液相浸渍还原法和微波合成技术对催化剂PtMo1/2/C微观形貌、晶体结构和甲醇电氧化催化活性影响的基础上。系统研究了Pt和Mo的原子配比对PtMox/C催化剂晶体结构、甲醇电氧化催化活性和抗CO中毒能力的影响。结果表明。微波法更有利于制得高结晶度、均匀分散、甲醇氧化催化活性更高的催化剂:微波法制得的催化剂PtMox/C中,Mo的加入虽然使催化剂的晶格参数有所改变。但PtMox/C仍表现为Pt的(fcc)晶型。其中PtMo1/2/C具有最好的甲醇氧化催化性能和抗CO中毒能力。
Effects of microwave-synthesis and impregnation method on the microstructure and the electro-catalytic activity of PtMo1/2/C catalyst were studied. In addition, the effects of atom ratio of Pt and Mo on the crystal structure, the electro-catalytic activity to methanol electro-oxidation and the CO tolerance of PtMox /C catalysts were investigated systematically. The results show that microwave-synthesis is more beneficial to obtain the highly dispersed catalyst and to improve the electro-catalytic 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 catalysts of PtMox/C, PtMo1/2/C is the best one for both methanol electro-catalytic-oxidation and CO tolerance.