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Updated: Jun 20, 2026

Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
Published on: June 21, 2017
On the current-voltage characteristics of charge transfer reactions at mixed conducting electrodes on solid
1Max-Planck-Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany. j.fleig@fkf.mpg.de
Abstract:
Even though the electrochemical oxygen reduction reaction at mixed conducting oxide electrodes is highly important for several applications of solid electrolytes a thorough discussion of the kinetics of electron and ion transfer steps at the corresponding electrode surface is not available yet. A straightforward application of current-voltage (I-V) relations derived for charge transfer reactions at electrode/electrolyte interfaces turns out to be inappropriate. In this contribution, a model is presented that relates concentrations of electrochemically active species and electrostatic potential steps at the electrode/gas interface of mixed conducting electrodes to the applied overpotential, and thus I-V formulas for the corresponding electron and ion transfer reactions are obtained. Depending on the specific parameters surprising effects are found such as an additional factor of two in the exponents of the I-V relation, irrelevance of the symmetry factor or limiting currents even if charge transfer is rate determining.
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