ZnI_(2)溶液中I离子电化学反应过程  

Electrochemical Reaction Processes of I Ion in ZnI_(2)Solution

作　　者：王毅然 童新[1] 熊大元[1,2] 王连卫[1] 徐少辉[1] Wang Yiran;Tong Xin;Xiong Dayuan;Wang Lianwei;Xu Shaohui(School of Communication and Electronic Engineering,East China Normal University,Shanghai 200241,China;Key Laboratory of Polar Materials and Devices of Ministry of Education,East China Normal University,Shanghai 200241,China)

机构地区：[1]华东师范大学通信与电子工程学院,上海200241 [2]华东师范大学极化材料与器件教育部重点实验室,上海200241

出　　处：《微纳电子技术》2022年第7期617-624,共8页Micronanoelectronic Technology

基　　金：国家自然科学基金资助项目(61991444);上海市科学技术委员会资助项目(18DZ2270800)。

摘　　要：采用旋转环盘电极的循环伏安(CV)与计时电流分析(CA)测试,研究了碘化物水溶液中I离子的氧化还原反应过程。在理想情况下,以KI水溶液为例,随着电压的增加每个I^(-)的传输电子数从2/3变为1,证明I^(-)先在溶液中通过I_(2)形成溶于水的I_(3)^(-),而后在碳电极表面形成I_(2)。在此理论基础上,通过对ZnI_(2)水溶液测试和计算,发现每个I^(-)的传输电子数从2/3渐增为1,ZnI_(2)溶液中由于锌与碘的络合作用阻碍了I^(-)的氧化过程。最终通过在ZnI_(2)溶液中加入有机溶剂(乙醇),可使传输电子数迅速从0上升为1(甚至超过1),表明I^(-)在低电压下便可形成I_(2),因此通过诱导Zn^(2+)与有机溶剂形成大分子络合物,能够释放I^(-),缓解锌碘络合作用,增加其反应活性。The cyclic voltammetry(CV)and chronoamperometry(CA)measurements of a rotating ring-disk electrode were used to investigate the redox reaction process of I^(-) in iodide aqueous solution.In an ideal case,with KI aqueous solution as an example,the number of transporting electrons per I^(-)changes from 2/3 to 1 with the increase of voltage,proving that I^(-) first forms water-soluble I_(3)^(-)through I_(2) in the solution,and then forms I_(2) on the surface of carbon electrode.On the basis of the theory,through the measurement and calculation of ZnI_(2) aqueous solution,it is found that the number of transporting electrons per I^(-) increases gradually from 2/3 to 1,and the oxidation process of I^(-) is hindered by the complexation of zinc and iodine in ZnI_(2)solution.Finally,by adding organic solvent(ethanol)to the ZnI_(2) solution,the number of transporting electrons rapidly increases from 0 to 1(even more than 1),indicating that I^(-)can form I_(2)at low voltage.Therefore,by inducing Zn2+to form macromolecular complex with organic solvent,I^(-)can be released,the complexation of zinc and iodine can be alleviated,and the reaction activity of I^(-)can be increased.

关 键 词：旋转环盘电极 碘化锌溶液 氧化还原反应 锌碘络合物 反应活性 

分 类 号：O646[理学—物理化学]