Study on the anomalous corrosion of oxygen evolving electrode in organic electrolysis and the development of new electrode materials

发生在负极电极表面的阴极电解还原过程被广泛应用于许多工业过程中，如金属的电积和电镀，有机物质的电解还原。在这些电解过程中，水的氧化析氧反应作为发生在对正极表面的无目的阳极氧化过程被广泛应用。对于这些对电极材料，近年来一直采用铅合金，最终研制出了人们期待已久的高性能电极。这种新开发的材料是铂族元素包覆钛电极，如二氧化铱包覆钛。但将该电极应用于有机电解过程中，会发生意想不到的电极异常腐蚀。在本研究中，澄清了这种由有机物与析氧电极表面相互作用引起的异常现象。然后在二氧化铱涂层中加入氧化钽，制备了有机物质高电阻电极涂层。新研制的Ir(70mol%)Ta（30mol%）氧化钛包覆电极具有高耐电解磨损和低电极析氧电位的优良性能。

The cathodic electrolytic reduction processes occured on the surface of negative pole elctrode are widely applied in many industrial processes,namely electrowinning and elctroplating of metals,and elctrolytic reduction of organic substances. In these elctrolytic processes,the oxygen evolution reaction by the oxidation of water are widely applied as the aimless anodic oxidation process occured on the surface of counter positive pole electrode. For these counter electrode materials,the lead alloys were used up to recent time and at last long-expected high performance elctrode were developed. This newly developed materials are platimum group element coated titanium electrode,for example iridium dioxide coated titanium. But applying this electrode for organic electrolytic proxesses,unexpected anomalous corrosion of electrode are occured.In this study,this anomalous phenomena caused by the interaction of organic substances and the oxygen evolving electrode surfaces were clarefied.And then the highly resistive electrode coating to organic substances were developed by the addition of tantalum oxide to iridiun dioxide coatings. This newly developed electrode of Ir(70mol%)Ta(30mol%)-oxide coated titanium have good performance of high resistance to electrolytic weare and low electrode potential for oxygen evolution.