铅铋合金在H2SO4溶液中析氧反应研究

采用线性电位扫描法、气体收集实验以及电化学阻抗法研究了纯铅电极和铅铋w(Bi)=0.05%]合金电极在硫酸溶液中的析氧反应.阳极极化曲线测量表明,相同电位下,纯铅电极上的析氧电流稍小于铅铋合金电极上的析氧电流;氧气收集实验.表明,相同电位下,纯铅电极上收集到的氧气的体积稍小于铅铋合金电极;交流阻抗实验表明,在两种电极上的析氧反应均受电荷传递控制,且相同电位下,纯铅上的析氧反应电阻略大于铅铋合金电极上的反应电阻.铅铋合金中0.05%铋的存在对析氧反应有催化作用,但影响不大.因而,适量铋的存在并不会增大电池的水损失.

A study on the oxygen evolution reaction on lead-bismuth alloy in sulfuric acid solution

Oxygen evolution reactions on pure lead and lead-bismuth alloy were studied by linear sweep voltammetry, measurement of the volume of oxygen evolution and alternative current impedance. The reaction current of oxygen evolution on lead was lower than that on lead-bismuth alloy at the same potentials in the anodic polarization curves. The volume of oxygen evolution on lead was smaller than that on lead-bismuth alloy at the same anodic potential. It was found that the oxygen evolution reactions on both lead and lead-bismuth alloys were controlled by charge transfer step. The reaction resistance for oxygen evolution obtained from the nyquist plots on lead was larger than that on lead-bismuth alloy at the same anodic potentials. Bismuth in lead-bismuth alloys played a role that catalyzed oxygen evolution, but its effect was not remarkable and therefore the exist of water in bismuth would not increase the loss of water in the lead-acid battery.