镍在BMIC-GL离子液体中的阳极溶解行为  

Dissolution Behavior of Nickel Anode in BMIC-GL Ionic Liquid

作　　者：赵霁雯 徐存英[1,2] 华一新[1,2] 李坚[1,2] 刘海鹏[1] 王震[1] 

机构地区：[1]昆明理工大学冶金与能源工程学院,云南昆明650093 [2]复杂有色金属资源清洁利用国家重点实验室,云南昆明650093

出　　处：《昆明理工大学学报（自然科学版）》2014年第3期5-11,共7页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(21263007;51274108);云南省自然科学基金重点项目(2011FA009);昆明理工大学人才培养项目(14118441)

摘　　要：采用恒电流溶解法和动电位极化曲线研究了BMIC-GL（1-butyl-3-methylimidazolium chloride-glycerin）离子液体中镍的阳极溶解行为．恒电流溶解结果表明，镍阳极的电化学溶解反应为Ni-2e＝Ni2＋；动电位极化曲线研究表明，镍的阳极溶解过程可以分为电化学反应控制区、混合控制区、扩散控制区．在电位范围为0.65～1.1 V条件下，镍阳极溶解的化学反应主要受电化学控制，镍的阳极溶解速率随着电位的正移而逐渐增大；当电位范围为1.1～1.3V时，镍阳极的溶解逐渐趋于稳定，此时化学反应受混合控制（既受电化学控制，同时又受扩散控制）；当电位大于1.3V以后，镍阳极溶解速率增大到一定程度，不再随着电位的正移而发生改变，镍溶解进入扩散控制区．升高温度，增加搅拌速度，增加离子液体中Ni2＋的浓度都可以增加镍的阳极溶解极限电流密度，而且镍片经过阳极溶解处理后具有良好的抛光效果．The oxidation valence of nickel in BMIC-GL （1-butyl-3-methylimidazolium chloride-glycerin） ionic liquid is measured by the dissolution method of constant current. The results indicate that the dissolution reaction of nickel anode is Ni-2e=Ni2＋. The dissolution process of a nickel electrode in ionic liquid BMIC-GL is also studied using potentiodynamic polarization curve. The results indicate that the anodic dissolution process of nickel can be divided into electrochemically-controlled,hybrid-controlled and diffusion-controlled regimes. In the electrochemically -controlled regime （from 0.65 to 1.1 V ）,the dissolution rate of nickel increases with increasing potential.When the potential is in the range of 1.1 to 1.3 V,nickel anodic dissolution gradually stabilizes and electrochemical reaction is controlled by hybrid （being controlled by the electrochemical and by diffusion）.When the potential is greater than 1.3 V,the nickel anodic dissolution rate remains almost unchanged with increasing potential and nickel dissolved process entersdiffusion -controlled regimes. The anodic limiting current density increases with increasing agitation rate,temperature and concentration of Ni2＋in the ionic liquid.After the anodic dissolution,the surface of nickel anode becomes more polished.

关 键 词：镍 阳极溶解 BMIC-GL离子液体 动电位极化 抛光 

分 类 号：TQ153.2[化学工程—电化学工业]