SYNTHETIC SEMICONDUCTOR DIAMOND ELECTRODES - KINETICS OF SOME REDOX REACTIONS

Linear-sweep voltammograms were recorded on boron-doped diamond thin-f ilm electrodes in K3Fe(CN)(6), K4Fe(CN)(6), quinone, and hydroquinone solutions; transfer coefficients and rate constants for anodic and cat hodic reactions were determined. The reaction rates were compared to t he diamond samples' electrical characteristics measured by the impedan ce spectroscopy techniques. The polarization (faradaic) resistance of a redox reaction at its equilibrium potential was shown to be proporti onal to the specific resistance of diamond samples. Reaction rate cons tants for the quinone/hydroquinone system appeared to be significantly less than those for the Fe(CN)(3-/4-)(6) system. (C) 1997 Elsevier Sc ience S.A.