基于交流阻抗法的离子交换膜电阻研究  

Study on conductivity of ion exchange membranes with AC impedance method

作　　者：范永生[1] 陈晓[1] 王保国[1] 

机构地区：[1]清华大学化学工程系,北京100084

出　　处：《膜科学与技术》2011年第2期14-18,共5页Membrane Science and Technology

基　　金：国家自然科学基金(20876086;21076112);国家"863"课题(2007AA05Z245);国家重点基础研究发展计划(973计划)项目(2010CB227202)

摘　　要：利用交流阻抗谱测定技术,建立一种离子交换膜导电性能评价方法;使用两极室槽电解池,分别测得电解质溶液,以及膜和电解质溶液之和的电阻值,相减后得到离子交换膜在该电解液中的电阻值.通过并联电阻形成完整的半圆弧形交流阻抗谱,能够有效减小测量误差.利用硫酸水溶液体系、氯化钠水溶液体系,以及全钒液流电池的钒电解液体系验证基于交流阻抗谱的膜电阻测定技术准确性、实用性.在此基础上揭示阳离子交换膜、阴离子交换膜对离子的不同吸附特性,以及膜面电阻对电解质溶液浓度依存特性.研究结果对于发展离子交换膜快速表征技术,以及开发新能源领域的离子交换膜具有重要价值.Using AC impedance measurement,this study proposed a method to investigate ion exchange membrane area resistances;a two-polar cell holds membrane immersed in electrolyte solution,area resistance was determined by the difference of electricity resistance measured with or without a membrane.The error can be minimized by using a parallel electricity resistance.This method was proofed reliable and effective by measuring area resistances of a cation or an anion exchange membranes in electrolyte solution,including aqueous sulfuric acid,sodium chloride,and the real electrolyte used in vanadium redox flow battery（VRB）.The measured results revealed the various adsorption behaviors of cation and anion exchange membranes,and showed membrane area resistance dependence upon electrolyte solution concentration.This study will facilitate the development of ion exchange membranes and its application in renewable energy technology.

关 键 词：膜面电阻 离子交换膜 交流阻抗谱 全钒液流电池 

分 类 号：TM934.1[电气工程—电力电子与电力传动]