甲醇对炭载铂和四羧基酞菁钴催化氧还原动力学的影响

Influence of Methanol on the Kinetics of Oxygen Reduction on Pt/C and CoPcTc/C

运用旋转圆盘电极技术和线性扫描伏安方法研究比较了甲醇对炭载铂(Pt/C)和800℃热处理的炭载四羧基酞菁钴(CoPcTc/C)催化氧还原动力学的影响.结果表明,对于Pt/C催化剂,在大于0.64V和小于0.18V(vsSCE)的电位范围,甲醇的氧化和氧的还原互不影响,而在其它电位范围,甲醇使Pt/C催化氧还原的性能严重降低.对于800℃热处理的CoPcTc/C,在整个电位范围内,甲醇的存在对氧还原都没有影响,是一种活性较高、耐甲醇能力强的氧还原电催化剂.

The influences of methanol on the performances of Pt/C and CoPcTc(cobalt of tetracarboxyl phthalocyanine)/C heat-treated at 800 degreesC for oxygen reduction reaction(ORR) were studied and compared. The results showed that for Pt/C electrocatalyst methanol oxidation and ORR occurred with no apparent interaction above 0.64 V and below 0.18 V vs SCE. But in the range of 0.18 to 0.64 V, methanol adversely affects the performance of Pt/C for ORR, The methanol had no effect on the performance of CoPcTc/C heat-treated at 800 degreesC for ORR. Thus CoPcTc/C heat-treated at 800 degreesC is a promising catalyst for ORR with higher activity. and good methanol-tolerant ability.