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Study of the impedance of a platinum electrode in the system Cl2/Cl− (HClO4aq)

✍ Scribed by J. Llopis; M. Vázquez

Publisher
Elsevier Science
Year
1963
Tongue
English
Weight
779 KB
Volume
8
Category
Article
ISSN
0013-4686

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✦ Synopsis

A Randles circuit has been used as a first approximation to explain the a.c. impedance of a platinum electrode in the system Cl&l-(HCIO,.,). However, in all cases the coefficient of the Warburg impedance is much higher than the theoretical value. This fact is interpreted in terms of the surface oxidation of the electrode. The adjustment of an equivalent circuit may be improved by considering the admittance due to electrode reactions at the oxidized part of the surface. The values of the exchange-current j,, obtained from electrode impedance measurements, show that system Cl,/Cl-is more irreversible than system Br,/Br-for the same experimental conditions.

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