S 54 Shkerin, S. N. Electrode System Ni/NayAlxV12O30/Al3+:An Impedance Spectroscopy Study / S. N. Shkerin, O. I. Gyrdasova, V. L. Volkov // Russian Journal of Electrochemistry. - 2002. - Vol. 38, № 5. - P496-506. - Bibliogr. : p. 505-506 (17 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ЭЛЕКТРОДНЫЕ СИСТЕМЫ -- ИМПЕДАНСНАЯ СПЕКТРОСКОПИЯ Аннотация: 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 NayAlxV12O30, 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 Полный текст |