高等学校化学学报

高等学校化学学报 ›› 2013, Vol. 34 ›› Issue (7): 1743.doi: 10.7503/cjcu20120955

• 物理化学 • 上一篇    下一篇

电化学石英晶体微天平研究高氯酸钠水溶液中活性炭电极的离子存储行为

高继超1,2, 殷娇1,2, 齐力1, 王宏宇1   

  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:2012-10-25 出版日期:2013-07-10 发布日期:2013-06-21
  • 通讯作者: 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.jl.cn E-mail:hongyuwang@ciac.jl.cn
  • 基金资助:

    国家自然科学基金(批准号: 21173206);国家"九七三"计划项目(批准号: 2011CB935702, 2012CB932800)和教育部留学回国人员科研启动基金资助.

Electrochemical Quartz Crystal Microbalance Studies on the Storage Behavior of Ions at Activated Carbon Electrodes in NaClO4 Aqueous Solutions

GAO Ji-Chao1,2, YIN Jiao1,2, QI Li1, WANG Hong-Yu1   

  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:2012-10-25 Online:2013-07-10 Published:2013-06-21
  • Contact: Hongyu Wang E-mail:hongyuwang@ciac.jl.cn

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被引次数

6

摘要：

以电化学石英晶体微天平(EQCM)为主要测试手段, 在不同浓度的高氯酸钠(NaClO4)水溶液中研究了水合离子吸附到活性炭电极孔隙过程中电极的质量变化. 对于每种电解液, 根据Raman光谱和EQCM数据分别计算了本体溶液中和电极/溶液界面上Na+的水合数. 通过比对这两组Na+水合数, 探讨了Na+存储到活性炭负极过程中的去溶剂化效应.

关键词: 石英晶体微天平, 高氯酸钠, 活性炭, 电化学电容器

Abstract:

Electrochemical quartz crystal microbalance(EQCM) was used to study the mass changes on activated carbon electrodes in various NaClO4 aqueous solutions during the course of ions adsorption into the pores of the electrode. For each electrolyte solution, the hydration numbers of Na+ in the bulk solutions and at the electrode/solution interface were calculated from Raman and EQCM data, respectively. These two sets of hydration numbers of Na+ were compared and the desolvation effect of Na+ was investigated. Results indicate that the desolvation effect of Na+ is suppressed by increasing the concentrations of NaClO4 aqueous solutions, which may be one of the main reasons for the improvement of the supercapacitors' power density. At the same time, results also prove that EQCM is an excellent tool for studies on ions' adsorption.

Key words: Electrochemical quartz crystal microbalance(EQCM), NaClO4, Activated carbon, Electrochemical capacitor

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