摘要
实验发现中性分子N，N-双水杨醛乙二胺合钴［Co（salen）］可以通过简单浸泡进入全氟磺酸（Nafion）膜，形成具有稳定电化学响应的Co（salen）-Nafion修饰电极．X射线光电子能谱表明，Co（salen）中心钴原子能与Nafion膜中磺酸根基团形成轴向配位，而使其由十2价变为十3价状态．电化学研究表明，Co（salen）在Nafion膜中的电荷转移是由电活性物迁移和电子跳跃共同控制的．同时发现Co（salen）-Nafion修饰电极能催化分子氧的二电子还原反应．
A Co(salen)-Nafion modified electrode was prepared by immersing a glassy carbon electrode coated with the Nafion film into the aqueous solution with saturatedCo(salen). The modified electrode showed a stable electrochemical reaction of Co(salen) atabout O V(vs. SCE). The result of XPS indicated the valence of cobalt in Co(salen) changesfrom +2 before to +3 after Co(salen) enters the Nafion film- It is due to forming axis coordination of cobalt with sulfonic group in Nafion film. It was found that the mode of electrontransfer in Co(salen)-Nafion modifled electrode was controlled by physical diffusion and electron hopping, It was also found that the modified electrode could catalyze the reduction of O2to H2O2. The real catalyst may be the adduct of CoⅡ(salen) and O2.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1997年第3期360-363,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
