Electrochemical behavior of graphene nanosheets in alkylimidazolium tetrafluoroborate ionic liquid electrolytes: influences of organic solvents and the alkyl chains
Electrochemical behavior of graphene nanosheets in alkylimidazolium tetrafluoroborate ionic liquid electrolytes: influences of organic solvents and the alkyl chains
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石墨烯纳米片在烷基咪唑鎓四氟硼酸盐离子液体电解质中的电化学行为:有机溶剂和烷基链的影响
DOI:
10.1039/c1jm11930c
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发表时间:
2011-08
影响因子:
--
通讯作者:
Xue Qunji
中科院分区:
文献类型:
--
作者:
Liu Wenwen;Yan Xingbin;Lang Junwei;Xue Qunji
In this study, the electrochemical properties of graphene nanosheets (GNSs) in alkylimidazolium tetrafluoroborate ionic liquids/organic solvent electrolytes are investigated by cyclic voltammetry (CV), galvanostatic charge/discharge and electrochemical impedance spectroscopy (EIS). The organic solvents with different functional groups exhibit a significant influence on the electrochemical properties of the GNSs. From series of organic solvents, in 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF4)/N,N-dimethylformamide (DMF, C3H7NO) electrolyte the GNS electrode shows the best electrochemical performance. Furthermore, the effect of the alkyl chains of ionic liquids on the electrochemical properties of GNSs was also evaluated through the electrochemical tests. The electrochemical properties of GNS electrode in 1-methyl-3-methylimidazolium tetrafluoroborate (MMIMBF4)/DMF electrolyte are better than those in EMIMBF4/DMF and 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4)/DMF electrolytes. This may be attributed to the difference in the length of the alkyl chain on the imidazole ring, which results in the structural change of the electrode/ionic liquid interface and thus affects the electrochemical performance of the GNS electrode.
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