以甘蔗渣为原料,采用微波化学活化法制备了一类纳米孔碳,并将其用作离子液体超级电容器的电极材料.采用氮气吸附、扫描电子显微镜和透射电子显微镜等手段对制备的纳米孔碳进行系统的结构表征.结果表明,当氯化锌溶液的浓度从20%增大到60%时,所制备的纳米孔碳的孔径从2.5nm增加到7.0nm,这说明纳米孔碳的孔径可以简单地通过控制氯化锌溶液的浓度来调节.通过循环伏安、恒流充放电和电化学阻抗等方法测试纳米孔碳作为离子液体超级电容器电极材料时的电化学性质.研究结果表明,在离子液体中纳米孔碳的电容性能与其孔径紧密相关,纳米孔碳的孔尺寸越大,电容性能越好.
A kind of nanoporous carbon has been successfully prepared from sugarcane bagasse through a facile microwave-induced ZnCl2 activation and tested as electrode material in ionic liquid supercapacitor.The as-prepared nanoporous carbons are systematically characterized by a variety of means such as N2 adsorption,SEM (scanning electron microscope) and TEM (transmission electron microscope).Characterization results reveal that the pore size of nanoporous carbons can be tuned from 2.5 nm to 7 nm by simply adjusting the concentration of ZnCl2 solution from 20 wt% to 60 wt%.The nanoporous carbons are tested as electrode materials in ionic liquid using different electrochemical means such as cyclic voltammetry,constant current charge-discharge and electrochemical impedance spectroscopy.As evidenced by electrochemical measurements,the capacitive performances of the carbons are closely related to their pore sizes.It has been demonstrated that large pore size benefits the good capacitive performance of nanoporous carbon in ionic liquid electrolyte.
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