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Simulation of oxygen evolution reaction at porous anode from flowing electrolytes

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Abstract

Oxygen evolution reaction (OER) at flow-through porous anode was simulated with the aid of a mathematical model. The OER was assumed to be the only reaction that takes place at the electrode. The model accounts for effects of the kinetics, ohmic, hydrodynamics, and structural parameters and bubble formation on the potential and current distributions within the electrode and on the overall performance of the electrode. The latter was evaluated via interpretation of the polarization curves of the OER at the porous anode. The model results were discussed in the light of some controlling dimensionless groups. The conductivities of both the electrolyte and the solid matrix have dramatic effects on the general behavior of the porous anode, and lower performance of the electrode was observed when both and/or one of them have limited conductivity values. The electrode potential, and hence the power required to attain a specific current (rate), is highly dependent on the degree of bubble formation within the bed matrix. The model predictions were compared with collected experimental data of OER from flowing sulfuric acid solution at Pt-loaded reticulated vitreous carbon. Good agreements were obtained at the employed experimental conditions. The present work helped to understand the anode performance for further application for simultaneous gas evolution, e.g., O2 and O3 gases.

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Authors and Affiliations

  1. Chemistry Department, Faculty of Science, Cairo University, Cairo, Egypt

    Mahmoud M. Saleh

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  1. Mahmoud M. Saleh
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Correspondence to Mahmoud M. Saleh.

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Saleh, M.M. Simulation of oxygen evolution reaction at porous anode from flowing electrolytes. J Solid State Electrochem 11, 811–820 (2007). https://doi.org/10.1007/s10008-006-0227-7

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  • DOI: https://doi.org/10.1007/s10008-006-0227-7

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