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Square wave electrolysis II: The cyclic current-step method

✍ Scribed by M. D. Wijnen; W. M. Smit

Book ID
104586125
Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
738 KB
Volume
79
Category
Article
ISSN
0165-0513

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✦ Synopsis

Abstract

A new method, designated the cyclic current‐step method, for the evaluation of kinetic parameters of electrochemical processes (especially the exchange current j~0~) is introduced in addition to the well‐known (single) current‐step method. Its essential basis is that a square wave current is forced through a polarisable electrode and the voltage response of the electrode is measured.

It is shown mathematically that the voltage response approaches a constant pattern when “coulomb‐symmetry” is present and a gradually changing pattern is observed when a departure from coulomb‐symmetry occurs. Even when the pattern is continuously changing due to the presence of coulomb‐asymmetry the evaluation of j~0~ may be easily achieved.

By means of the cyclic current‐step method it is easily visualised whether or not the influence of the double layer capacity is negligible. Moreover, the method provides a ready means for the elimination of the ohmic part of the voltage response of the electrolytic cell.

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