Electroreduction of Fe3+, O 2, and Fe ( CN ) 6 3 − at the n‐Pyrite ( FeS2 ) Surface

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Abstract
The electroreduction of , Fe3+, and on the pyrite surface in the dark has been studied with the rotating disk electrode technique. Saturation of the cathodic current density with the concentrations of and Fe3+ and with rotation speed was observed. The potential drop within the solid and the Helmholtz layer varied with the applied potential. The results are interpreted in terms of a charge‐transfer model involving mediation by bandgap surface states. Fermi level pinning is ascribed to the presence of surface states and the possible origins of these surface states are discussed.

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