阳极二氧化铅膜的阴极还原为硫酸铅的机理

应用旋转环盘电极, 和静止电极线性电位扫描法(LSV)研究铅上阳极PbO~2膜的阴极还原为PbSO~4的机理。实验结果表明相应于Pb盘上阳极膜中PbO~2还原时所产生的Pb-7w/oSb环电流是原先PbO~2膜生长时析出的氧扩散入膜中以及膜内的PbO~2微粒中的品种逸出而被还原所致。无可溶性中间体可被检出。扫速对静止Pb上阳极膜中PbO~2的LSV法还原的影响符合薄膜反应的规律。本文提出了上述反应机理。

The mechanism of the cathodic reduction of anodic PbO~2 film to PbSO~4

The mechanism of the reduction of PbO2 to PbSO4 in the anodic film on Pb was investigated using rotating ring-disk electrode (RRDE), and linear sweep voltammetry (LSV) at a stationary electrode. The anodic film studied was formed on Pb in sulfuric acid solution The experimental results of RRDE method show that the Pb-7wt.% Sb ring current during the reduction of the PbO2 in the anodic film on the Pb disk is due to the reduction of oxygen having previously diffused into the film as well as into the PbO2 particles in the film. No evidences of soluble intermediates have been detected. The effects of scan rate on LSV for the reduction of PbO2 in the anodic film on Pb conform to the reduction of a thin oxidized film. The mechanism of the mentioned reduction was suggested.