发泡金属电极的宏观反应速率及电势分布

研究了发泡金属电极的性质 ,得出了描述发泡金属电极床层中宏观反应速率、反应速率随时间的变化、床层中电解液的电势分布方程式 .以K₃Fe(CN) ₆的阴极还原反应为研究体系 ,采用垂直型隔膜电解槽对上述方程进行了实验验证 ,测定了发泡镍、发泡铜作阴极时床层中电解液的电势分布 ,研究了电解质进口浓度、电解液流速、电解液有效电导率、槽电压、电极尺寸等因素对电解液电势分布的影响 ,模型结果与实验结果符合较好

Macrosight Reaction Rates and Distributions of Potential of Electrolytes in Foamed Metal Elecrodes

The characteristics of foamed metal electrodes are investigated to study electric potential distribution in electrolytes on foamed metal cathodes and the mathematical models are proposed.The equations of macro-reaction rates and the changes of reaction rates with electrolysis time are obtained.The electrolytic reduction of Fe(CN) 3- 6 on foamed metal cathodes is studied and the electric potential distribution in the electrolytes on foamed nickel and foamed copper cathodes is measured.The effects of concentration, flow rate, conductance of electrolyte,cell voltage,cathode dimension on potential distribution are studied. The results show that the potential distribution tends to be uniform with decreasing cell voltage and decreasing flow rate and with increasing conductance of the electrolyte. As the thickness of the cathode ( x 0) is fixed,potential distribution in the radial x -direction tends to be uniform with increasing height,of the cathode.As the height of the cathode is fixed,potential distribution in the flow direction ( y -direction) of the electrolyte is tends to be uniform with increasing thickness of the cathode.The general potential drop at the inlet is almost directly proportional to x 2 0,and at the separator membrane location potential distribution in the y -direction is least of all uniform.As x is fixed, the potentical distribution in the y -direction is nearly an exponential function of y .The results show that the mathematical models are validated by the experiments .