【摘要】 采用三种还原剂 ,通过化学还原沉积得到Pt/C催化剂 ,其中甲酸钠还原得到的催化剂制成的电极性能最好。为降低铂用量 ,采用Pt Pd/C混合催化剂代替Pt/C催化剂 ,通过对不同Pd含量催化剂及其电极性能的研究 ,确定了最佳配比为Pd占贵金属总含量 6 5 %。近年来Pt/C Nafion电极性能有很大提高 ,Nafion加入后堵塞了一部分气孔 ,阻碍气体传质 ,在催化剂合膏时加入一定量的无水Na2 SO4 ,电极成型后再发孔 ,Na2 SO4 被溶解掉 ,留下大量孔隙 ,透气性增加 ,在一定程度上解决了传质问题。更多还原

【Abstract】 Using three different reducing agents, the Pt/C catalysts were obtained by a chemical reduction method, and the sodium formate was the best reducing agent. Took Pt-Pd/C catalyst instead of Pt/C for redu- cing Pt content. The results show that the optimum prescription of mixed catalyst, i. e. the Pd, is 65% of total expensive metal. Recently, the performances of the Pt/C-Nafion electrode were improved greatly, but a part of air holes were blocked up for Nafion addition, and that stopped up transmission of gas. Some Na 2SO 4 in paste preparation of catalyst was added, then many holes left over when Na 2SO 4 dissolve into water after electrode was manufactured, so permeability for gas increased, and the transmission was improved.更多还原