Ti基Ru-Ir-Ti电极在稀氯化钠溶液中的电解失效行为  

Electrolytic Invalidation Behavior of Ti Based Ru-Ir-Ti Electrode in Dilute Sodium Chloride Solution

作　　者：杨瑞锋 贾波 郭敏[1,2] 武晨航 李金岳 郝小军 冯庆 YANG Ruifeng;JIA Bo;GUO Min;WU Chenhang;LI Jinyue;HAO Xiaojun;FENG Qing(Xi’an Taijin Industrial Electrochemical Technology Co.,Ltd.,Xi’an 710021,China;Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China)

机构地区：[1]西安泰金工业电化学技术有限公司,西安710021 [2]西北有色金属研究院,西安710016

出　　处：《材料导报》2024年第13期168-172,共5页Materials Reports

基　　金：陕西省重点研发计划(2017ZDXM-GY-041)。

摘　　要：金属钛电极具有高催化活性、高耐久性能、易加工生产等优点,可应用于氯碱工业、饮用水消毒、循环冷却水处理等方面,在许多领域拥有广阔的发展前景。然而,其失效机理大多在硫酸溶液中进行,不能真实反映电极在氯化钠环境下工作的实际状况。鉴于此,本工作采用电化学与表面物理方法对Ru-Ir-Ti电极在稀氯化钠溶液中的加速电解过程进行了研究。对加速电解不同阶段的研究表明:电极的失效是一个渐变过程,电解前期,涂层表面钌的溶解速率较快,之后电极呈现均匀腐蚀,活性物质Ru、Ir逐渐减少。涂层在表面和内部的电解消耗导致涂层疏松、结构被破坏,当活性物质减少到临界点时,起导电性的电催化活性物质缺失,反应进行缓慢,槽电压升高,这是电极失效的主要原因,研究过程尚未发现电极基底发生钝化现象。同时研究表明,电解产生的次氯酸钠不会对电极性能造成影响。Titanium electrode has been regarded as a promising material with wide applications in chlor alkali industry,drinking water disinfection,circulating cooling water treatment owing to its unique properties,such as high catalytic activity,high durability,easy processing,etc.However,the invalidation mechanism is mostly carried out in sulfuric acid solution,which can not really reflect the actual situation of the electrode working in sodium chloride environment.In view of this,electrochemical and surface physical methods were used to study the accelerated electrolysis process of Ru-Ir-Ti electrode in dilute sodium chloride solution.The results of different stages of accelerated electrolysis show that the invalidation of the electrode is a gradual process,and the dissolution rate of ruthenium on the surface of the coating is faster in the early stage of electrolysis,and then the electrode is uniformly corroded,and the active materials Ru and Ir are gradually reduced.The electrolytic consumption of the coating on the surface and inside leads to loose coating and structural damage,when the active substance decreases to the critical point,the electrocatalytic active substance with conductivity is missing,the reaction proceeds slowly,and the cell voltage rises,which is the main reason for electrode invalidation,and the passivation phenomenon of the electrode substrate has not been found in the research process.At the same time,studies have shown that sodium hypochlorite produced by electrolysis will not affect the performance of the electrode.

关 键 词：钛电极 氯化钠溶液 失效机理 均匀腐蚀 电极失效 次氯酸钠 

分 类 号：TQ151[化学工程—电化学工业]