CALCULATION OF ELECTROCHEMICAL OVERPOTENTIAL AND CONCENTRATION OVERPOTENTIAL BASED ON CURVE OF ANODIC POLARIZATION IN HYDROGEN STORAGE ALLOY ELECTRODE

来源期刊：中国有色金属学报(英文版)1999年第2期

论文作者：Pan Hongge

文章页码：260 - 264

Key words：electrochemical overpotential　,concentration overpotential　,anodic polarizationhydrogen storage alloy

Abstract: It was investigated in detail how to calculate the electrochemical polarization overpotential V_e and concentration polarization overpotential V_c based on anodic polarization curve in hydrogen storage alloys electrode. The results show that the experimental anodic polarization curve should be divided into three regions to discuss according to discharge current density J_d, namely,J_d＜J_p,J_p＜J_d＜J_f.and J_d＜J_f. In different regions, the calculation forVeandVcshould use different formulas. When discharge current density J_d is smaller than J_p, the traditional equation used to calculate the electrochemical overpotential can’t be used, whenJdis between J_p and J_f, both equations used to calculate the electrochemical overpotential and concentration overpotential can be used, and whenJdis larger than J_f, because there exists absorption and adsorption of hydrogen, the traditional equation used to calculate concentration overpotential can’t be used in the system of hydride electrodes.