氯化胆碱-乙二醇低共熔溶剂中Sn^(2+)/Sn的电化学行为  

Electrochemistry of Sn^(2+)/Sn in choline chloride-glycol deep eutectic solvents

作　　者：苏波[1] 李坚[1,2] 华一新 徐存英[1,2] 李艳 艾刚华[1] SU Bo;LI Jian;HUA Yixin;XU Cunying;LI Yan;AI Ganghua(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;State Key Laboratory of Complex Nonferrous Metal Resources Cleaning Utilization,Kunming 650093,China)

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]省部共建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：《中南大学学报（自然科学版）》2018年第9期2129-2136,共8页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究发展计划(973计划)项目(2014CB643404);国家自然科学基金资助项目(51504112)~~

摘　　要：采用循环伏安法和计时安培法研究在氯化胆碱-乙二醇低共熔溶剂SnCl_2·2H_2O/[1ChCl:2EG] DES中,Sn^(2+)/Sn的电化学行为和Sn的电结晶形核机理。研究结果表明:Sn的电沉积需要一定的过电位,并随温度的升高,所需的过电位减小;获得323 K时的传递系数α为0.35,Sn2+的扩散系数为1.628×10-6 cm2/s;在303~343 K内,Sn^(2+)在SnCl_2·2H_2O/[1ChCl:2EG] DES中的电还原反应属于受扩散控制的准可逆过程;当阴极施加电位较小(较正)时,Sn在玻碳电极上的电结晶过程为受扩散控制的三维瞬时形核,当阴极施加电位较大(较负)时,Sn的电结晶过程更趋向于三维连续形核。The electrochemical behaviors of Sn2+/Sn and the nucleation mechanism of the electrocrystallization of tin in choline chloride-glycol deep eutectic solvents SnCl2·2H2O/[1ChCl:2EG]DES were studied by means of cyclic voltammetry and chronoamperometry.The results show that a certain overpotential is required for tin electrodeposition and the required overpotential decreases with the increase of temperature.The transfer coefficientαis calculated to be 0.35 and the diffusion coefficient of Sn2+is estimated to be 1.628×10?6 cm2/s at 323 K.The electroreduction of Sn2+in SnCl2·2H2O/[1ChCl:2EG]DES is a quasi-reversible process controlled by diffusion at 303?343 K.When the applied potential on cathode is lower(more positive),the initial electrocrystallization process of Sn on a GC electrode is found to be a three-dimensional instantaneous nucleation under diffusion control by chronoamperometry.When the applied potential on cathode is larger(more negative),it is more likely to be three-dimensional progressive nucleation.

关 键 词：低共熔溶剂 氯化胆碱-乙二醇 电化学 电结晶 形核机理 

分 类 号：TF111.52[冶金工程—冶金物理化学]