期刊
JOURNAL OF MOLECULAR LIQUIDS
卷 249, 期 -, 页码 795-804出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molliq.2017.11.078
关键词
Ionic liquids; Imidazolium; Transport properties; Graphene; Supercapacitors; Energy storage
资金
- PHC-UTIQUE project [17G 1209]
The preparation of a series of novel low viscosity 1-allyl-3-methylimidazolium ionic liquids (ILs) is performed following dedicated synthetic routes. The physico-chemical properties of resulting molecular solvent-free ILs (true ILs) are investigated and discussed systematically toward the anion constituents. Herein, six electrolytes are studied including one planar structured anion (DCA(-)) and five anions presenting non-planar structures (PF6-, TFSI-, BF4-, TFA(-) and OTf-). The as-prepared ILs are employed as green electrolytes for symmetric electrochemical double layer capacitors (EDLCs) based on graphene nanosheets (GNS) electrodes. The EDLC devices deliver specific capacitances ranging from 135 to 228 F.g(-1), and suitable energy densities, ranging from 41 to 115 Wh.kg(-1). An electrochemical stability of 94% is reached upon 1000 charge/discharge cycles over a large cell voltage window (34 V) with a quasi-ideal capacitive behaviour. Among the studied ILs, 1-allyl-3-methylimidazolium dicyanmide (AMIM-DCA) exhibit the highest specific capacitance and the maximum energy density. Such a performance is attributed to the compatibility between the channel-based 2-D graphene network and the planar structure of AMIM-DCA. The resulting AMIM-DCA/GNS interface facilitates the reversible adsorption/desorption process of electrolyte ions during the charge storage. Accordingly, the studied EDLC cells are promising candidates for high-capacity and high-reliability energy-storage applications. (C) 2017 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据