氨络合物体系中Ti基IrO_2涂层阳极的析氮过程  

Nitrogen evolution of Ti based IrO_2 anodes in leaching solution containing ammonia and chloride

作　　者：郑国渠[1] 郑利峰[1] 曹华珍[1] 张九渊[1] 

机构地区：[1]浙江工业大学材料科学与工程研究所,杭州310014

出　　处：《中国有色金属学报》2005年第1期84-88,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50004005)

摘　　要：采用线性扫描技术研究了氯盐氨络合物体系中 Ti基 IrO2 涂层阳极的析氮过程, 对 3 种含有不同氧化物涂层电极的析氮电催化性能进行了比较, 并结合扫描电镜(SEM)及能谱(EDX)探讨了不同析氮电催化活性的原因。研究结果表明: 当电极电位低于1.1 V(vs SCE)时, Ti基 IrO2 涂层阳极析气反应主要为析氮反应, 氮气的产生主要是由于氨水在电极上发生电化学氧化引起的; Ti基含 PdRuTi的 IrO2 涂层阳极具有最佳的析氮电催化活性, 其可能原因是金属元素PdRuTi的存在导致该电极表面特征裂纹最宽且最深, 氧化物涂层总析氮面积增多,电催化活性增加。Nitrogen evolution on Ti based IrO_2 anodes in leaching solution containing ammonia and chloride was investigated by means of linear sweep voltammetric technique. The electrocatalytic activities of three different kinds of Ti based IrO_2 containing different oxides species were compared with each other. The reasons of different electrocatalytic activities corresponding to different anodes were examined in terms of SEM and EDX. The results show that the main reaction on Ti based IrO_2 anodes is nitrogen evolution, which is ascribed to the electrochemical oxidation of ammonia at electrode potential lower than 1.1V or so. The Ti based IrO_2 anode containing Pd, Ru, Ti elements displays better electrocatalytic activity. It is probably due to the existence of elements, such as Pd, Ru, Ti, which results in a wide and deep, typical morphology of cracks. The typical morphology of cracks contributes to the existence of electrochemically active surface area and an improvement of electrocatalytic active for nitrogen evolution.

关 键 词：氨络合物体系 Ti基IrO2 阳极 析氮 电催化活性 

分 类 号：TF813[冶金工程—有色金属冶金]