Tafel slope electrochemical surface area

The performance of oxide electrodes depends on both factors, electronic and geometric. The latter is especially important since the preparation of oxide layers as a rule produces very high surface areas. A way to disentangle the two factors is to scrutinize the behavior of an intensive property. In electrochemical kinetics, the Tafel slope is the most appropriate, since it depends closely on the reaction mechanism and not on the extension of the surface area. 

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