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用循环伏安法(CV),旋转圆盘和环盘电极(RDE和RRDE)研究了电化学聚合的钴原卟啉二甲酯薄膜玻碳电极〔聚(CoPP)/GC〕对氧还原反应的电催化和动力学。在不同pH缓冲溶液中,在聚(CoPP)/GC电极上氧的还原反应主要为二电子还原为H_2O_2的过程。实验表明,当聚(CoPP)薄膜在玻碳(GC)表面的覆盖度(Γ)大于6×10~(10)mol/cm~2时,催化反应受聚(CoPP)薄膜内电荷传输过程控制;当Γ值小于6×10~(-10)mol/cm~2时,受聚(CoPP)与氧分子间的催化反应速率控制。随电位负移,i_k,ΚΓ,n和K值均增加;随Γ值或溶液pH增加,i_k,ΚΓ和K值减小,而n值略有增加。
Electrochemical polymerization of cobalt protoporphyrin dimethyl ester thin-film glassy carbon electrode [poly (CoPP) / GC] was studied by cyclic voltammetry (CV), rotating disk and ring disk electrode (RDE and RRDE) Electrocatalysis and Kinetics. In different pH buffer solutions, the reduction reaction of oxygen on the poly (CoPP) / GC electrode is mainly the process of two-electron reduction to H 2 O 2. The experimental results show that the catalytic reaction is controlled by the process of charge transport in the CoPP film when the coverage (Γ) of the poly (CoPP) film is greater than 6 × 10 ~ (10) mol / cm ~ 2 on the surface of glassy carbon When the Γ value is less than 6 × 10 ~ (-10) mol / cm ~ 2, the rate of catalytic reaction between CoPP and oxygen molecules is controlled. With the negative potential shift, the values of i_k, KΓ, n and K increased. With the increase of Γ or solution pH, the values of i_k, ΚΓ and K decreased while the values of n increased slightly.