摘要
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的机理。
The mechanism of the reduction of PbO_2 to PbSO_4 in the anodic film on Pb was investigated using rotating ring-disc electrodo (RRDE), and linear sweep voltammetry at stationary electrode (LSV). The anodic film studied was formed on Pb in sulfurio acid solution. The experimental results of RRDE method show that the Pb-7w/o Sb ring current during the reduotion of the PbO_2 in the anodic film on the Pb disc is due to the reduction of oxygen having previously diffused into the film as well as into the PbO_2 particles in the film. No evidences of soluble intermediates have been detected. The effects of scan rate on LSV for the reduction of PbO_2 in the anodic film on Pb conform to the reduotion of a thin oxidized film. The mechanism of the mentioned reduction was suggested.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1992年第1期27-31,共5页
Acta Chimica Sinica
基金
国家自然科学基金
