Abstract
The impedance of electrochemical cells Ni/VOB/Al3+, Ni/VOB/Na+, and Ni/VOB/Ni (where VOB stands for vanadium oxide bronzes of the general formula Na y Al x V12O30, with 0 < x ≤ 1.7) is studied both at equilibrium and a constant-current polarization. Variations in the VOB composition and aqueous electrolytic solutions in contact with the bronze as a result of the passing of the current are monitored. The results of these measurements are employed to substantiate a model that describes the occurrence of processes of current production in the Ni/VOB/Al3+ electrode system. The overvoltage is defined to a substantial degree by the aluminum diffusion. The diffusion coefficients for aluminum, its partial conductivity, and transport number are estimated.
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