Influence of mass transport on the performance of carbon gas-diffusion air electrodes in alkaline solution |
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| Authors: | I Iliev S Gamburzev A Kaisheva J Mrha |
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| Affiliation: | 1. Central Laboratory for Electrochemical Power Sources, Bulgarian Academy of Sciences, Sofia 13
2. J. Heyrovsky Institute of Physical Chemistry and Electrochemistry, Czechoslovak Academy of Sciences, Prague 10
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| Abstract: | The effect of mass transport on the electrochemical behaviour of carbon gas-diffusion air electrodes in alkaline solution was investigated on the basis of ΔE(i) curves. These curves are obtained by subtraction of potential values for an electrode operating with airE air(i) from potential values for the same electrode operating with pure oxygenE oxygen(i) at the same current densityi. Three different regions on these curves connected with different modes of mass transport are recognized. A model of the gas-diffusion air electrode which takes into account the diffusion of the gas, diffusion of the dissolved gas, electrochemical reaction and IR drop is used to explain the experimental results. |
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