Abstract: Nickel phthalocyanine(NiPc)-didodecyldimethylammonium bromide(DDAB) surfactant film electrode could be prepared by casting the mixture of NiPc with DDABchloroform solution on the surface of pyrolytic graphite electrode and then leaving the chloroform evaporated.Cyclic voltammetric experiments showed that,in KBr solution,the film electrode have two pairs of well-defined and stable reduction and oxidation peaks,For the first pair of peaks,E_pc1=-0.64 Vand E_pa1=-0.60 V(vs.SCE),while for the second pair,E_pc1 =-0.84 V,and E_pa1=-0.80 V,respectively,This paper studied the electrochemistry of the second pair emphatically.The electrochemical parameters,such as electron diffusion coefficient,D_e,and apparent heterogeneous electrode reaction rate constant,k^0',were estimated.The NiPc-DDAB film electrode could be used to catalyze electrochemical reduction of various halogenated acetic acids.The NiPc-DDAB films were also characterized by various techniques of surface analysis.

Key words: Nickel phthalocyanine, Surfactant film electrode, Electrochemical catalysis