References
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- Bonham and Lyons . in the previous reference, explain the form of (2) by invoking a mechanism in which θ is constant, the Ce4+ anode initially injects othe holes into deep traps in the surface region, and the field assists in the emptying of the traps that lie within image force range of the anode. we agree with Bonham and Lyons on the necessity to invoke deep traps in the surface region, but for a different reason. We feel that the reason the Schottky addition to (2) refers to the trapped carrier and not the free carrier (which should obey the same Schottky equation) is that there may be a smaller image force on the free carrier thn the trapped carrier. Since the free carrier hopping frequency is about 1013 sec−1, the electrolyte electrode may not be able to exert its static dielectric constant or experience dielectric relaxation on such a time scale even for the electrolyte concentrations used23. As for the trapped carrier which does not move, the full image force is exerted in this case, and the Schottky effect will therefore be exhibited.
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