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- W2080821855 abstract "The apparent heterogeneous rate constant, k°app, for three couples known to undergo outer-sphere electron transfer reactions has been investigated at carbon, gold, and platinum electrodes as a function of solution pH. The rates are found to be pH dependent at two different types of glassy carbon and at carbon paste but not at metallic electrodes. The rate is found to decrease with increasing pH for Fe(CN)3−4−6 and IrCl2−3−6, and the opposite effect is observed for the Ru(NH3)3+2+6 couple. For the three compounds examined, the magnitude of the pH dependent rate changes can be associated with a change in the magnitude of the potential of the reaction layer induced by a change in surface charge of ∼ 2 × 10−7 C cm−2. The pH dependence of the observed rate constant at glassy carbon can be attenuated by heat treatment, chemical reduction, or esterification of the surface. This behaviour is consistent with the theory that the pH dependence of k°app arises from the presence of functional groups on the carbon surface." @default.
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- W2080821855 date "1985-01-01" @default.
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- W2080821855 title "The effect of pH on some outer-sphere electrode reactions at carbon electrodes" @default.
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- W2080821855 doi "https://doi.org/10.1016/0368-1874(85)85444-7" @default.
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