Fluorine-free Ionic Liquid Based on Thiocyanate Anion with Propylene Carbonate as Electrolytes for Supercapacitors:Effects of Concentration and Temperature

doi:10.1007/s40242-017-7100-3

Chemical Research in Chinese Universities ›› 2017, Vol. 33 ›› Issue (5): 779-784.doi: 10.1007/s40242-017-7100-3

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Fluorine-free Ionic Liquid Based on Thiocyanate Anion with Propylene Carbonate as Electrolytes for Supercapacitors:Effects of Concentration and Temperature

ZHANG Lifeng¹, DU Suqing¹, SONG Qiaolan¹, LIU Yi¹, GUO Shouwu^1,2

1. School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, P. R. China;
2. Department of Electronic Engineering, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China

Received:2017-03-16 Revised:2017-06-20 Online:2017-10-01 Published:2017-07-10
Contact: ZHANG Lifeng,E-mail:zhanglifeng@sust.edu.cn;GUO Shouwu,guoshouwu@outlook.com E-mail:zhanglifeng@sust.edu.cn;guoshouwu@outlook.com
Supported by:
Supported by the National Natural Science Foundation of China(No.21203116)；the Scientific Research Fund of San-qin Scholar, China(No.BJ11-26)； the Natural Science Foundation of Shaanxi Province, China(No.2015JM5151)； the Scientific Research Fund of Shaanxi University of Science and Technology, China[No.XSG(4)006].

Abstract

Abstract:

High performance supercapacitors were constructed using ionic liquid 1-ethyl-3-methylimidazolium thiocyanate(EmimSCN)-based electrolyte with chemically reduced graphene oxide(CRGO) as electrodes. Propylene carbonate(PC) was selected as the solvent due to its stable physical and electrochemical properties. Then, in -depth study of the concentration and temperature effects on the electrochemical properties of the EmimSCN/PC electrolyte was carried out. Electrochemical measurements revealed that 2.0 mol/L EmimSCN/PC electrolyte delivered good electrochemical performance(131 F/g of the specific capacity after 3000 cycles at room temperature). Moreover, the assembled supercapacitors exhibited good capacitive behavior at an extending temperature(397 F/g of the specific capacity after 3000 cycles at 50℃), demonstrating that the EmimSCN/PC electrolyte is a promising candidate for safe high-power supercapacitors.

Key words: Electrolyte, Supercapacitor, Ionic liquid, Chemically reduced graphene oxide, Capacitance

ZHANG Lifeng, DU Suqing, SONG Qiaolan, LIU Yi, GUO Shouwu. Fluorine-free Ionic Liquid Based on Thiocyanate Anion with Propylene Carbonate as Electrolytes for Supercapacitors:Effects of Concentration and Temperature[J]. Chemical Research in Chinese Universities, 2017, 33(5): 779-784.

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Fluorine-free Ionic Liquid Based on Thiocyanate Anion with Propylene Carbonate as Electrolytes for Supercapacitors:Effects of Concentration and Temperature

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