【作者】 缪灵； 朱大章； 徐子颉； 刘明贤； 甘礼华；

【Author】 Ling Miao;Dazhang Zhu;Zijie Xu;Mingxian Liu;Lihua Gan;School of Chemical Science and Engineering,Tongji University;

【机构】 同济大学化学科学与工程学院；

【摘要】 碳基超级电容器是通过电极材料与电解液界面间形成的双电层来存储能量的高功率密度器件^[1,2]。具有宽电化学窗口的离子液体电解液常被用于组装高能量密度超级电容器,但是其高粘度和大离子尺寸阻碍了离子在微孔碳电极中的快速传输^[3]。本文利用引发剂过硫酸铵使离子液体3,5-二氨基苯甲酸硫酸盐发生化学氧化聚合得到主链聚离子液体,经同步碳化-活化后可控合成微孔-介孔碳纳米片（MMCSs）,比表面积为2885 m² g^-1,具有与电解液离子尺寸相近的微孔（0.79 nm）以及为电解液传输提供快速通道的介孔（2-4 nm）。将其组装成以离子液体EMImBF₄为电解液的对称式超级电容器,MMCS电极在电流密度为0.5 A g^-1下的比电容达到了206 F g^-1,该器件展现出3.5 V的高工作电压,在功率密度为175 W kg^-1时能量密度可达94.4 Wh kg^-1,说明MMCS电极与离子液体具有良好的兼容性,是一种适用于组装高能量密度超级电容器的理想碳电极。更多还原

【Abstract】 As a class of high-power-density devices,carbon-based supercapacitors store energy through the electric double layer formed at the electrode-electrolyte interface.Ionic liquid electrolytes with a wide electrochemical window are often used to fabricate high-energy-density supercapacitors,but their high viscosity and large ion size result in the slow ion transport in microporous carbon electrodes.Herein,tunable synthesis of micro-mesoporous carbon nanosheets （MMCSs） is reported via simultaneous carbonization-activation of the main-chain poly（ionic liquid） which is obtained by chemical oxypolymerization of an ionic liquid 3,5-diaminobenzoic acid sulfate using ammonium persulfate as initiator.MMCSs own with surface area of 2885 m² g^-1,micropore size of 0.79 nm that is close to the electrolyte-ion size,as well as mesopore size of 2-4 nm that can provide fast channels for electrolyte transport.The MMCS//MMCS symmetric supercapacitor is fabricated using ionic liquid EMImBF₄ as electrolyte.The MMCS electrode exhibits a high specific capacitance of 206 F g^-1 at the current density of 0.5 A g^-1.The device exhibit a high operating voltage of 3.5 V and a high energy density of 94.4 Wh kg^-1 at the power density of 175 W kg^-1,indicating that the MMCS electrode is an ideal carbon electrode for high-energy-density supercapacitors owing to its good compatibility with ionic liquid electrolytes.更多还原