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To me, comparisons of energy levels of electrons in the CB or VB with Ecorr or reversible potential can only tell if electrons will involve in the corresponding electrochemical reactions. It is different than determination of the direction of how electrons or holes drift. For example, in this paper, energy level of electrons in CB of ZnO is lower than the energy level of electrons in the Zinc oxidation reaction. Therefore, electrons in CB cannot result in oxidation of Zn. However, electrons in CB can still certainly drift back to Zn substrate as long as it is an ohmic junction between ZnO/Zn and Fermi level of Zn is lower than CB of ZnO, which is very likely.
Authors  need to explain why OCP increased under illumination.

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[ Last edited by cxksama on 2014-3-10 at 13:33 ]
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