Engineering the electrochemical capacitive properties of graphene sheets in ionic-liquid electrolytes by correct selection of anions

doi:10.1002/cssc.201402275

CORC > 兰州理工大学 > 兰州理工大学 > 省部共建有色金属先进加工与再利用国家重点实验室

	Engineering the electrochemical capacitive properties of graphene sheets in ionic-liquid electrolytes by correct selection of anions
	Shi, Minjie 1,2; Kou, Shengzhong 1; Yan, Xingbin 2,3
刊名	ChemSusChem
	2014-11-01
卷号	7 期号:11 页码:3053-3062
关键词	Electrolytes Ionic liquids Molecular weight Negative ions Supercapacitor Viscosity Electrical conductivity Electrochemical behaviors Electrochemical performance Electrochemical stabilities Ionic liquid electrolytes Reaction mechanism Specific capacitance Specific energy density
ISSN号	18645631
DOI	10.1002/cssc.201402275
英文摘要	Graphene sheet (GS)-ionic liquid (IL) supercapacitors are receiving intense interest because their specific energy density far exceeds that of GS-aqueous electrolytes supercapacitors. The electrochemical properties of ILs mainly depend on their diverse ions, especially anions. Therefore, identifying suitable IL electrolytes for GSs is currently one of the most important tasks. The electrochemical behavior of GSs in a series of ILs composed of 1-ethyl-3-methylimidazolium cation (EMIM+) with different anions is systematically studied. Combined with the formula derivation and building models, it is shown that the viscosity, ion size, and molecular weight of ILs affect the electrical conductivity of ILs, and thus, determine the electrochemical performances of GSs. Because the EMIM-dicyanamide IL has the lowest viscosity, ion size, and molecular weight, GSs in it exhibit the highest specific capacitance, smallest resistance, and best rate capability. In addition, because the tetrafluoroborate anion (BF4-) has the best electrochemical stability, the GS-[EMIM][BF4] supercapacitor has the widest potential window, and thus, displays the largest energy density. These results may provide valuable information for selecting appropriate ILs and designing high-performance GS-IL supercapacitors to meet different needs. © 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
WOS研究方向	Chemistry ; Science & Technology - Other Topics
语种	英语
出版者	Wiley-VCH Verlag
WOS记录号	WOS:000344538400011
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/113508]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院
作者单位	1.State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Department of Material Science and Engineering, Lanzhou University of Technology, Lanzhou; 730000, China 2.Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou; 730000, China; 3.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou; 730000, China;
推荐引用方式 GB/T 7714	Shi, Minjie,Kou, Shengzhong,Yan, Xingbin. Engineering the electrochemical capacitive properties of graphene sheets in ionic-liquid electrolytes by correct selection of anions[J]. ChemSusChem,2014,7(11):3053-3062.
APA	Shi, Minjie,Kou, Shengzhong,&Yan, Xingbin.(2014).Engineering the electrochemical capacitive properties of graphene sheets in ionic-liquid electrolytes by correct selection of anions.ChemSusChem,7(11),3053-3062.
MLA	Shi, Minjie,et al."Engineering the electrochemical capacitive properties of graphene sheets in ionic-liquid electrolytes by correct selection of anions".ChemSusChem 7.11(2014):3053-3062.