Electrochemistry and Electrochemical Catalysis of Cobalt Phthalocyanine Tetrasulfonate-DDAB Surfactant Film Electrodes

Abstract

Abstract: Cobalt phthalocyanine tetrasulfonate (CoPcTS_4-) anions in aqueous solutions could enter the films of cationic surfactant didodecyldimethylammonium bromide (DDAB) films by ion exchange and form CoPcTS_4--DDABfilm electrodes. Cyclic voltammetry (CV) showed in pH_7.0 blank buffers, the films were quite stable and had two pairs of quasireversible redox peaks. The first pair shown at E_pc1= -0.28 Vand E_pa1=-0.18 V (vs. SCE) was attributed to the redox couple of Co(II)/Co(I) of CoPcTS_4-, while the second set at E_pc2=-1.30 Vand E_pa2=-1.18 Vcorresponds to the redox process of phthalocyanine ring. The charge transport diffusion coefficient, D_ct, and apparent heterogeneous electrode reaction rate constant, k^o', were estimated by CV. CoPcTS_4--DDAB films could be used to catalyze electrochemical reduction of trichloroacetic acid (TCA). Catalytic current had a linear relationship with the concentration of TCAin the range of 4×10^-5-1×10^-3 mol/L.

Key words: Cobalt phthalocyanine tetrasulfonate, Surfactant film electrode, Electrochemistry, Electrochemical catalysis.

CLC Number:

O657.1

TrendMD:

HU Nai-Fei, HUANG Rong, YANG Jing . Electrochemistry and Electrochemical Catalysis of Cobalt Phthalocyanine Tetrasulfonate-DDAB Surfactant Film Electrodes[J]. Chem. J. Chinese Universities, 1999, 20(8): 1200.

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Electrochemistry and Electrochemical Catalysis of Cobalt Phthalocyanine Tetrasulfonate-DDAB Surfactant Film Electrodes

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