酞菁锰-表面活性剂薄膜电极的电化学表征及其对三氯乙酸的电化学催化作用的研究

Electrochemistry of Manganese Phthalocyanine Surfactant Film Electrode and Its Electrochemical Catalysis for Trichloracetic Acid

将酞菁锰（ＭｎＰｃ）掺入阳离子表面活性剂双十二烷基二甲基溴化铵（ＤＤＡＢ）的氯仿溶液，并涂布于热解石墨电极表面，待氯仿挥发后即制得ＭｎＰｃ－ＤＤＡＢ薄膜电极。循环伏安实验表明，在ＫＢｒ溶液中，该薄膜电极有两对还原氧化峰，第一对峰的Ｅｐｃ１＝－０．２７Ｖ，Ｅｐａ１＝０．０１Ｖ；第二对峰的Ｅｐｃ２＝－０．７６Ｖ，Ｅｐａ２＝－０．６２Ｖ（ｖｓ．ＳＣＥ）。本文着重探讨了第二对峰的电化学行为，估计了该体系的电荷传递扩散系数Ｄｃｔ和表观非均相电极反应速率常数Ｋ０′等电化学参数，并可将该薄膜电极用于催化三氯乙酸的电化学还原。

anganese phthalocyanine(MnPc) didodecyldimethylammonium bromide(DDAB) surfactant film electrode was prepared by casting the mixture of MnPc with DDAB chloroform solution onto the surface of pyrolytic graphite electrode and then evaporating the chloroform .Cyclic voltammetric experiments showed that,in KBr solution,the film electrode had two pairs of well defined and stable reduction and oxidation peaks.For the first pair of peaks, E pc1 =-0 27V and E pa1 =0 01V( vs .SCE) ,while for the secnd pair, E pc2 =-0 76V, E pa2 =-0 62V.This paper studied the electrochemistry of the second pair in detail.The electrochemical parameters ,such as charge transfer diffusion coefficient, D ct ,and apparent rate cnstant of heterogeneous electrode reaction, K 0′ ,were estimeted.The MnPc DDAB film electrode could be used to catalyze electrochemical reduction of trichloracetic acid