Large‐sized reduced graphene oxide prepared was prepared by combined microwave intermittent heating and an extraction process (e.g., 900 W for 10 min (MRG‐900‐10)) with a lateral size of several micrometers and a thickness of 4–6 monosheets . The MRG‐900‐10 has a high C/O molar ratio (5.89) and a sp² C content of 69.0 %, which leads to a fast electronic transmission in the sample. In addition, MRG‐900‐10 possesses a large specific surface area of 568.2 m² g⁻¹, which increases the contact surface area between the active material and the electrolyte, thus enhancing the electron and ion transport in the interfaces when used as the electrode material in supercapacitors. MRG‐900‐10 possesses a low charge‐transfer resistance (≈0.36 Ω). Used as the electrode material for a supercapacitor in 6 m KOH aqueous electrolyte, MRG‐900‐10 produces a high specific capacity of 327.6 F g⁻¹ at the current density of 0.5 A g⁻¹. A specific capacity of 248.3 F g⁻¹ was obtained at a high current density of 100 A g⁻¹, which indicated its high‐rate ability. The initial capacity of 92 % can be maintained after 40 000 cycles at 5 A g⁻¹, which indicated its high cycling stability. As for the MRG‐900‐10 symmetric supercapacitors, the energy densities of 11.0 and 36.2 Wh kg⁻¹ were obtained in 6 m KOH aqueous and 1 m tetraethylammonium tetrafluoroborate ([TEA]BF₄)/acetonitrile (ACN) electrolytes, respectively. Importantly, a high energy density of 68.6 Wh kg⁻¹ was achieved in the nonflammable ionic liquid 1‐ethyl‐3‐methylimidazolium bis(trifluoromethane)sulfonimide ([EMIM][TFSI])/ACN (80 vol % [EMIM][TFSI]), and the supercapacitor was effective from room temperature to 100 °C.

中文翻译：

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具有低电荷转移电阻的大型还原氧化石墨烯作为高性能电极，用于不可燃高温稳定的基于离子液体的超级电容器

通过微波间歇加热和萃取过程（例如900 W，持续10分钟（MRG-900-10））的组合，制备了大尺寸的还原氧化石墨烯，其横向尺寸为几微米，厚度为4–6单片。MRG‐900‐10的C / O摩尔比（5.89）高，sp ² C含量为69.0％，从而可以实现样品中的快速电子传输。此外，MRG‐900‐10具有568.2 m ²  g ^-1的较大比表面积当用作超级电容器中的电极材料时，这增加了活性材料与电解质之间的接触表面积，从而增强了界面中电子和离子的传输。MRG‐900‐10具有较低的电荷转移电阻（≈0.36Ω）。在6 m KOH的水性电解质中用作超级电容器的电极材料时 ，MRG‐900‐10在电流密度为0.5 A g ^-1时可产生327.6 F g ^-1的高比电容。的248.3 F G的具体容量^-1在100 g的高电流密度下获得^-1，这表明它的高速率的能力。在5 A g ^-1下经过40 000次循环后，可以维持92％的初始容量，表明其高循环稳定性。对于MRG-900-10对称超级电容器，在6 m KOH水溶液和1  m四氟硼酸四乙铵（[TEA] BF ₄）/乙腈（ACN）电解质中分别获得 11.0和36.2 Wh kg ^-1的能量密度。重要的是，68.6瓦kg的高能量密度^-1在不可燃的离子液体1-乙基-3-甲基咪唑鎓双（三氟甲烷）磺酰亚胺（[EMIM] [TFSI]）/ ACN（80体积％[EMIM] [TFSI达到]），超级电容器在室温至100°C的温度下均有效。