CIESC Journal ›› 2016, Vol. 67 ›› Issue (12): 5276-5282.DOI: 10.11949/j.issn.0438-1157.20160870

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Applications of cyanate ionic liquids in graphene-based supercapacitors

ZHANG Lifeng1, DU Suqing1, LIU Yi1, YUAN Xiaoyan1, HUANG Jianfeng1, GUO Shouwu1,2   

  1. 1 School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, Shaanxi, China;
    2 School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2016-06-27 Revised:2016-09-19 Online:2016-12-05 Published:2016-12-05
  • Supported by:

    supported by the National Natural Science Foundation of China(21203116) and the Special Preliminary Study Plan of National Basic Research Program of China(2014CB260411).

氰酸盐离子液体在石墨烯基超级电容器中的应用

张利锋1, 杜素青1, 刘毅1, 原晓艳1, 黄剑锋1, 郭守武1,2   

  1. 1 陕西科技大学材料科学与工程学院, 陕西 西安 710021;
    2 上海交通大学电子信息与电气工程学院, 上海 200240
  • 通讯作者: 郭守武。swguo@sjtu.edu.cn
  • 基金资助:

    国家自然科学基金项目(21203116);国家重点基础研究发展计划前期研究专项课题(2014CB260411)。

Abstract:

Supercapacitors were constructed with graphene as electrodes and ionic liquid N-methyl-N-propylpyrrolidinium cyanate([C3mpyr] [OCN])/propylene carbonate(PC) as the mixed electrolytes. The electrochemical properties of constructed supercapacitors were tested at 50, 60 and 70℃ by cyclic voltammetry(CV), electrochemical impedance spectroscopy(EIS) and galvanostatic charge/discharge(GCD). The results indicated that the constructed supercapacitors exhibited good electrochemical properties at high operating temperatures. The supercapacitors gave the specific capacity of 295 F·g-1 and delivered an energy density as high as 118 W·h·kg-1 at 70℃ with the current density of 0.5 A·g-1. Additionally, the constructed supercapacitors showed a good cycling stability.

Key words: supercapacitors, ionic liquids, graphene, electrochemistry, electrolytes

摘要:

将石墨烯电极与离子液体N-甲基-N-丙基吡咯烷氰酸盐([C3mpyr][OCN])/碳酸丙烯酯(PC)混合电解液组装成超级电容器,采用循环伏安(CV)、交流阻抗(EIS)、恒电流充放电(GCD)等方法研究了其在50、60、70℃环境下的电化学性能。结果表明:该体系在较高温度下的电化学性能优异,70℃下其比容量最高可达295 F·g-1,能量密度可达118 W·h·kg-1,且恒电流充放电循环稳定性较好。

关键词: 超级电容器, 离子液体, 石墨烯, 电化学, 电解质

CLC Number: