Carbon materials have become one of the research hotspots in the field of materials because of their excellent performance. Material scientists at home and abroad have developed a large number of research work. With the support of the "Hundred Talents Program" of the Chinese Academy of Sciences and the National Natural Science Foundation of China, the research team led by the researcher Yan Xingbin, the State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences A series of research work has been carried out, aiming to develop a new type of nano-carbon electrode material for supercapacitors that is environmentally friendly, wide operating temperature, high energy density and high power density, and has achieved good research results.
Recently, the research team has made new research progress in graphene-based supercapacitors. The researchers investigated the effect of the molar concentration and temperature of the ionic liquid electrolyte on graphene's capacitance performance, and found that graphene had the best capacitance performance when the molar concentration of ionic liquid was 2 M. At the same time, the results of the study show that the graphene / ionic liquid system exhibits good capacitance in the temperature range of -20 ° C to 60 ° C, and the capacitance has a small dependence on temperature. Related research results were published in the recently published J. Mater. Chem. 2012, 22, 8853.
Previously, the research team also studied the effects of the types of organic solvents and the chain length of the cationic alkyl chain of the imidazole ionic liquid on the capacitance performance of graphene. The research results were published in J. Mater. The magazine was selected as Highlight; in addition, the research team used self-assembly and composite technology to prepare graphene thin films and shape memory electrode materials, these materials exhibited excellent capacitance performance, and related research results were published in the journal of the electrochemical field Electrochim. Acta. 2012, 60, 41 and J. Power. Sources. Doi: 10.1016 / j.jpowsour.2012.03.086.
At the same time, the research team also carried out application research based on carbon nanotubes, mesoporous carbon and carbon nanofiber materials in supercapacitors, and related research results have been published in J. Power. Source
(a) Voltage drop of graphene electrode in BMIMBF4 electrolyte with different molar concentrations; (b) Relationship between specific capacity and current density of graphene electrode in BBMIMBF4 electrolyte with different molar concentrations.
(a) Graphene electrode voltage drop in 2 M BMIMBF4 electrolyte at different temperatures; (b) Relationship between specific capacity and current density of graphene electrode in 2 M BMIMBF4 electrolyte at different temperatures.
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