TITLE

Fluctuations in electrochemical systems. II. Application to a diffusion limited redox process

AUTHOR(S)
Gabrielli, C.; Huet, F.; Keddam, M.
PUB. DATE
November 1993
SOURCE
Journal of Chemical Physics;11/1/1993, Vol. 99 Issue 9, p7240
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A model of the stochastic behavior of the electrochemical interface is presented when a redox reaction limited by the diffusion of the reacting species occurs on the electrode surface. As shown in the first paper [J. Chem. Phys. 99, 7232 (1993)] it leads to the current–voltage curve, the electrochemical impedance and the power spectral density (PSD) of the electrochemical noise (current fluctuations in potentiostatic control or potential fluctuations in galvanostatic control). A comparison with experiment is performed for the potassium ferri-ferrocyanide reaction on platinum. The noise generated by reaction-diffusion is measured after eliminating the parasitic noise sources. At equilibrium the Nyquist theorem is experimentally checked, whereas far from equilibrium the measured excess noise is found to be in good agreement with the theory.
ACCESSION #
7619671

 

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