电化学石英晶体微天平研究高氯酸钠水溶液中防冻添加剂对活性炭电极储存离子的影响

doi:10.7503/cjcu20130676

高等学校化学学报 ›› 2014, Vol. 35 ›› Issue (3): 608.doi: 10.7503/cjcu20130676

电化学石英晶体微天平研究高氯酸钠水溶液中防冻添加剂对活性炭电极储存离子的影响

高继超^1,², 齐力¹, 王宏宇¹()

1. 中国科学院长春应用化学研究所, 长春 130022
2. 中国科学院大学, 北京 100049

收稿日期:2013-07-18 出版日期:2014-03-10 发布日期:2019-08-01
作者简介:联系人简介: 王宏宇, 男, 博士, 研究员, 博士生导师, 主要从事电化学和能源材料研究. E-mail: hongyuwang@ciac.ac.cn
基金资助:
国家“九七三”计划项目(批准号: 2012CB932800, 2011CB935702)、国家自然科学基金(批准号: 21173206)和教育部留学回国人员科研启动基金资助

EQCM Studies on the Effect of Anti-freezing Additives on the Storage Behavior of Ions at Activated Carbon Electrodes in NaClO₄ Aqueous Solutions^†

GAO Jichao^1,², QI Li¹, WANG Hongyu^1,^*()

1. Changchun Insititute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
2. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2013-07-18 Online:2014-03-10 Published:2019-08-01
Contact: WANG Hongyu E-mail:hongyuwang@ciac.ac.cn
Supported by:
† Supported by the National Key Basic Research Program of China(Nos.2012CB932800, 2011CB935702), the National Natural Science Foundation of China(No.21173206) and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry of China

摘要/Abstract

摘要：

利用电化学石英晶体微天平(EQCM)研究了含有防冻添加剂(甲醇、乙醇)的高氯酸钠水溶液中的Na⁺离子在活性炭表面的吸附过程. 根据EQCM数据估算了电极/溶液界面上与Na⁺络合的甲醇、乙醇分子的数量, 研究了Na⁺的溶剂化效应随本体溶液中防冻添加剂浓度的变化趋势, 以及对活性炭电极比容量的影响.

关键词: 电化学石英晶体微天平, 高氯酸钠, 活性炭, 防冻添加剂

Abstract:

Electrochemical quartz crystal microbalance(EQCM) was used to investigate the adsorption of Na⁺ into the micropores of activated carbon in 5 mol/L NaClO₄+x mol/L MeOH and 5 mol/L NaClO₄+x mol/L EtOH aqueous solutions. Molecule numbers of methanol or ethanol associated with each Na⁺ at the interfaces were estimated. The results show that methanol and ethanol are adsorbed into the micropores together with Na⁺; the higher the concentration of methanol and ethanol in bulk solutions was, the more molecule numbers of methanol or ethanol associated with each Na⁺ adsorpted into the pores of activated carbon; methanol and ethanol adsorpted into the pores occupied some space of the micropores and lowered the dielectric constant of the double layers, thus suppressed the specific capacitance of Maxsorb negative electrodes.

Key words: Electrochemical quartz crystal microbalance(EQCM), NaClO₄, Activated carbon, Anti-freezing additive

中图分类号:

O646

TrendMD:

高继超, 齐力, 王宏宇. 电化学石英晶体微天平研究高氯酸钠水溶液中防冻添加剂对活性炭电极储存离子的影响. 高等学校化学学报, 2014, 35(3): 608.

GAO Jichao, QI Li, WANG Hongyu. EQCM Studies on the Effect of Anti-freezing Additives on the Storage Behavior of Ions at Activated Carbon Electrodes in NaClO₄ Aqueous Solutions^†. Chem. J. Chinese Universities, 2014, 35(3): 608.

图/表 4

Fig.1 Cyclic voltammograms of activated carbon electrodes(A) and in situ EQCM responses when Na+ was adsorbed into the micropores in various electrolytes(B)Electrolyte: a. 5 mol/L NaClO4; b. 5 mol/L NaClO4+3 mol/L EtOH; c. 5 mol/L NaClO4+5 mol/L MeOH. d. Theoritical curve.

Fig.2 Cyclic voltammograms(A, C) of activated carbon electrodes and in situ EQCM responses(B, D) when Na+ was adsorbed into the micropores in 5 mol/L NaClO4+x mol/L EtOH(A, B) and 5 mol/L NaClO4+x mol/L MeOH(C, D) aqueous solutions, respectively

Fig.3 Relationship between the specific capacitance of activated carbon electrodes(a, b), molar weight(c, d) of solvated Na+ and concentrations of ethanol or methanol in 5 mol/L NaClO4+x mol/L EtOH(b, d) or 5 mol/L NaClO4+x mol/L MeOH(a, c) aqueous solutions

Fig.4 Relationship between specific capacitance of activated carbon electrodes and molar weight of solvated Na+ in 5 mol/L NaClO4+x mol/L EtOH(a) and 5 mol/L NaClO4+x mol/L MeOH(b) aqueous solutions, respectively

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电化学石英晶体微天平研究高氯酸钠水溶液中防冻添加剂对活性炭电极储存离子的影响

EQCM Studies on the Effect of Anti-freezing Additives on the Storage Behavior of Ions at Activated Carbon Electrodes in NaClO₄ Aqueous Solutions^†

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电化学石英晶体微天平研究高氯酸钠水溶液中防冻添加剂对活性炭电极储存离子的影响

EQCM Studies on the Effect of Anti-freezing Additives on the Storage Behavior of Ions at Activated Carbon Electrodes in NaClO4 Aqueous Solutions†

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EQCM Studies on the Effect of Anti-freezing Additives on the Storage Behavior of Ions at Activated Carbon Electrodes in NaClO₄ Aqueous Solutions^†