气体在不同离子液体中电化学响应灵敏度的研究  

Study of the electrochemical response sensitivity of gases in different ionic liquids

作　　者：毕强[1] 张泽坤 张娱藤 薛娟琴[1] BI Qiang;ZHANG Ze-kun;ZHANG Yu-teng;XUE Juan-qin(School of Chemistry and Chemical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学化学与化工学院,陕西西安710055

出　　处：《化学研究与应用》2021年第4期621-629,共9页Chemical Research and Application

基　　金：国家自然科学基金项目(51874227)资助;陕西省自然科学基金重点项目(2017ZDJC-25)资助;陕西省教育厅产业化培育项目(18JC016)资助。

摘　　要：不同气体在不同离子液体中的电化学响应存在差异。本文以氢气、氧气作为目标研究气体,采用循环伏安法和计时安培电流法研究对比了基于两种不同离子液体[Bmpy][NTf_(2)]和[Bmim][NTf_(2)]的电化学传感器中气体的电化学行为,并就气体电化学信号的响应时间及灵敏度等电化学行为进行了讨论分析。结果表明:在[Bmpy][NTf_(2)]和[Bmim][NTf_(2)]中检测氢气的灵敏度分别为4.93μA/%和0.03μA/%,且其电化学信号值与浓度均呈线性正比关系;在[Bmpy][NTf_(2)]和[Bmim][NTf_(2)]中检测氧气的灵敏度分别为-0.055 mA/%和-0.002 mA/%,且其电化学信号值与浓度均呈线性正比关系。研究发现:相比于离子液体[Bmim][NTf_(2)],[Bmpy][NTf_(2)]中气体的灵敏度更高,响应性能更好,且对于氢气和氧气的混合气体同样适用。通过研究优选出更适用于检测氢气氧气的离子液体电解质溶液,为后续电化学气体传感器的开发研究提供了理论依据与技术支持。The electrochemical responses of different gases performs divergently in different ionic liquids.The hydrogen and oxygen were selected as the target study gases in this article,the cyclic voltammetry and the chronoamperometry were applied to study and analyze the electrochemical behavior including response time and sensitivity of these gases in ionic liquids[Bmpy][NTf_(2)]and[Bmim][NTf_(2)]based electrochemical sensor,respectively.The results showed that:the sensitivity of H 2 detection in[Bmpy][NTf_(2)]and[Bmim][NTf_(2)]are 4.93μA/%and 0.03μA/%,respectively.Furthermore,the relationship between the current signal and concentration of H 2 is linear;the sensitivity of O 2 detection in[Bmpy][NTf_(2)]and[Bmim][NTf_(2)]are-0.055 mA/%and-0.002 mA/%,respectively.Furthermore,the relationship between the current signal and concentration of O 2 is linear The research showed that gases tend to have better sensitivity and response ability in[Bmpy][NTf_(2)]compared with[Bmim][NTf_(2)],and it is also applicable to the mixed gas of hydrogen and oxygen.This work optimized the better ionic liquid electrolyte and could provide both of the theoretical and mechanical support for further study on electrochemical gas sensors.

关 键 词：氢气 氧气 离子液体 电化学行为 

分 类 号：O657.1[理学—分析化学]