Abstract
In this paper, an electrochemical study of the n-GaAs/Fe3+ system is presented. Combining the results of current density vs potential, Mott−Schottky, and electrochemical impedance measurements, it is shown that charge transfer through surface states is the most plausible reaction mechanism for the Fe3+ to Fe2+ reduction at the n-GaAs electrode. On the basis of the experimental impedance spectra and of the theoretical equivalent circuit derived in part 1 (Hens, Z. J. Phys. Chem. 1998, 103, 122), the charge-transfer mechanism is analyzed in detail. The Fe3+ reduction rate shows a marked evolution as a function of time which, basing upon the electrochemical impedance results, is attributed to an increase in the number of surface states.
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