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Fabrication of high performance supercapacitors based on ethyl methyl imidazolium bis(trifluoromethylsulfonyl) imide (EMIMTFSI)-decorated reduced graphene oxide (rGO)
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2021-09-24 , DOI: 10.1016/j.jallcom.2021.162093
Alireza Mohsenipour 1 , Mehrdad Mozaffarian 1 , Gholamreza Pazuki 1 , Leila Naji 2
Affiliation  

In this paper, we outline the construction of symmetric supercapacitors comprised of reduced graphene oxide (rGO) and hydrophobic ionic liquid (IL) (1-ethyl-3-methylimidazolium bis(trifluoromethyl sulfonyl)imide (EMIMTFSI) acting as physical spacer and electrolyte between rGO plates. To increase the porosity and interlayer spacing between the graphene plates, different solvents are analyzed by Hansen solubility parameters’ approach (HSP). Accordingly, the solubility performances of two solvents, namely Tween 80 and N, N-dimethylformamide (DMF), coupled with rGO and IL, are deemed to offer the most beneficial results, and they are the solvents used in this study to develop rGO/Tween 80/IL and rGO/DMF/IL electrodes. The comparison of the electrodes’ performances shows that the consumption of 80 wt percent IL would deliver the optimum electrochemical performance and capacitance results. At room temperature, the prepared rGO/Tween 80/IL80% and rGO/DMF/IL80% deliver capacitances of 375 and 213 F/g, respectively. The maximum energy density of rGO/Tween 80/IL electrode is 187.5 Wh/kg at a power density of 1125 W/kg, while for the rGO/DMF/IL electrode the maximum energy density reaches 106.5 Wh/kg at a power density as high as 639 W/Kg. The supercapacitors prepared based on rGO/Tween 80/IL80% and rGO/DMF/IL80% electrodes show capacitance retention of 90% and 84% after 10,000 charge-discharge cycles, respectively. This design approach eliminates the need for the prevalant stand-alone type of electrolyte in supercapacitors, and instead, the electrolyte is incorporated as a component of electrode’s structure.



中文翻译:

基于乙基甲基咪唑鎓双(三氟甲基磺酰基)酰亚胺(EMIMTFSI)修饰的还原氧化石墨烯(rGO)的高性能超级电容器的制备

电极性能的比较表明,消耗 80 wt% 的 IL 将提供最佳的电化学性能和电容结果。在室温下,制备的 rGO/Tween 80/IL80% 和 rGO/DMF/IL80% 的电容分别为 375 和 213 F/g。rGO/Tween 80/IL 电极在功率密度为 1125 W/kg 时的最大能量密度为 187.5 Wh/kg,而 rGO/DMF/IL 电极在功率密度为 106.5 Wh/kg 时的最大能量密度为高达 639 W/Kg。基于 rGO/Tween 80/IL80% 和 rGO/DMF/IL80% 电极制备的超级电容器在 10,000 次充放电循环后分别显示出 90% 和 84% 的电容保持率。这种设计方法消除了对超级电容器中盛行的独立类型电解质的需求,取而代之的是,

更新日期:2021-10-06
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