Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
Communications
Electrocatalytic Oxidation of 2,5-Dimercapto-1,3,4-thiadiazole by Polyaniline. 1 Use of N,N’-Diphenyl-p-phenylenediamine as a Model Compound of Polyaniline
Satoru MIHASHIHideaki MACHIDAOsamu HATOZAKINoboru OYAMA
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JOURNALS OPEN ACCESS

2001 Volume 69 Issue 12 Pages 991-993

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Abstract

In the present study, electrocatalysis by polyaniline was investigated using a model compound of polyaniline, N,N’-diphenyl-p-phenylenediamine (DPPD). Electrochemical measurements indicated that the highest oxidized form of DPPD, diimine, showed high electrocatalytic activity toward the oxidation of 2,5-dimercapto-1,3,4-thiadiazole, DMcT. On the contrary, one-electron oxidized form of DPPD, radical cation, shows only poor activity in the oxidation. Different electrocatalytic activity observed for polyaniline in the emeraldine salt form and the DPPD radical cation suggests that conductivity of polyaniline in the emeraldine salt form plays an important role in electrocatalysis by polyaniline. Based on the results it was expected that the use of DPPD and its oxidized form as model compounds for polyaniline in the different oxidation states is useful for discussion of relative contributions from redox polymer character and conducting polymer character of polyaniline in electrocatalysis.

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© 2001 The Electrochemical Society of Japan
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