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

发生在阴极电极表面的阴极电解还原过程广泛应用于许多工业过程，即金属的电解提取、电镀和有机物的电解还原。在这些电解过程中，水的氧化析氧反应作为发生在对阳极电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，直到最近才使用铅合金，并最终开发出期待已久的高性能电极。这种新开发的材料是铂族元素涂层钛电极，例如二氧化铱涂层钛。但将该电极应用于有机电解过程中，却出现了意想不到的电极异常腐蚀现象，本研究澄清了这一异常现象是由于有机物与电极表面析氧作用引起的，并通过在二氧化铱涂层中添加氧化钽，研制出了抗有机物的高阻电极涂层。这种新研制的Ir（70mol%）Ta（30mol%）氧化物涂层钛电极具有高的耐电解磨损性能和低的析氧电极电位。

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.