铅电极上电聚合聚苯胺及其析氧电催化性能研究

Electrosynthesis of polyaniline on lead electrode and its electrocatalytic characteristic

在苯胺-硫酸电解液中，采用电化学阳极氧化法在纯铅表面电沉积制备聚苯胺（PAn）膜层。探讨了苯胺电聚合过程的影响因素及其规律，并考察了所得Pb／PAn膜电极材料的析氧电催化特性。结果表明，在一定的恒电流密度下，聚苯胺的沉积量与时间成正比；与空白Pb电极相比，Pb／PAn膜电极的析氧电位负移0．13—0．36V，交换电流密度提高2—4个数量级，显示出良好的析氧电催化特性。作为析氧阳极。Pb／PAn膜电极在有色金属电解提取等方面具有潜在应用价值。

A polyaniline （PAn） film was deposited onto pure lead in aqueous solutions containing sulfuric acid and aniline by electrochemical anodic oxidation. The influential factors and rules of the electro-polymerization process of aniline were discussed. The oxygen-evolution electrocatalytic performance of the Pb/PAn film electrodes was also investigated. The results indicate that the deposition mass of polyaniline is proportional to electrolysis time under a definite constant current density; Compared with those of blank Pb electrode, the oxygen-evolution potential of the Pb/PAn film electrodeis shifted by 0.13 - 0.36 V negatively and its exchange current density rises by two to four orders of magni- tude, demonstrating the good oxygen-evolution electrocatalytic performance of the Pb/PAn electrode. As a kind of oxygen-evolution anode, the Pb/PAn film electrode has a potential application value in the electrowinning of non-ferrous metals and other related fields.