硫酸介质中铅阳极膜阴极还原过程的研究

The Study of the Cathodic Reduction of the Lead Anodic Films in Sulfuric Acid Solution

采用光电化学技术和实时交流阻抗测量等现场方法研究铅阳极膜的阴极还原过程，发现ＰｂＯ电位区阳极氧化形成的阳极膜在阴极还原时有两种ＰｂＯ的还原，即ｏ－ＰｂＯ和ｔ－ＰｂＯ二种氧化物的还原，还原过程中的电极阻抗变化情况表明ＰｂＯ层是均匀还原的，且是ｔ－ＰｂＯ先还原，ｏ－ＰｂＯ后还原．还分析了铅阳极膜在阴极还原过程中所表现出来的阴极光响应．

The cathodic reduction of the lead anodic films has been investigated by using in-situ temporary AC resistance measurement and photoelectrochemical technique. It is found that two forms of PbO, i. e. o-PbO and t-PbO, are reduced during the cathodic reduction of the anodic films formed in the potential region of PbO. The relationship between the electrode resistance (R) and t during the reduction suggests that the reduction of PbO is well-distributed on the electrode surface. The results also show that t-PbO is reduced before o-PbO. The cathodic photoresponse during the cathodic reduction of the lead anodic films are also studied.