Abstract
Voltammetric and coulometric results are described for the electrocatalytic oxidation of Cr(III) to Cr(VI) at the mixed bismuth(V)‐lead(IV) dioxide film electrodes (designated ) that are electrodeposited from acidic solutions of Pb(II) containing Bi(III). A current efficiency of 99.2% (σ = 1.1%, N = 12) is obtained for galvanostatic generation of Cr(VI) at a preconditioned film electrode. Preconditioning of the film merely involves the generation of Cr(VI) which, based on scanning electron micrographs, is concluded tentatively to achieve chemical stripping of noncatalytic portions of the films to produce films having greater electrocatalytic activity for the desired reaction. Electrochemical stripping of the electrode had a similar preconditioning effect. Based on wavelength dispersive spectroscopy, electrochemical stripping resulted in an increase in surface Bi concentration of 33% relative to Pb.
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