竹炭粉对无灰煤基活性炭结构和电化学性能的影响

Effect of bamboo charcoal powder on structure and electrochemical properties of ashless coal-based activated carbon

为探究竹炭粉添加比例对褐煤基无灰煤活性炭孔结构及其电化学性能的影响,采用KOH活化法,以褐煤基无灰煤和竹炭粉为原料制备活性炭,通过SEM、N_(2)吸脱附、XRD、FT-IR表征活性炭结构,通过交流阻抗、循环伏安、恒流充放电测试活性炭的电化学性能。结果表明,褐煤基无灰煤中加入竹炭粉后所制备活性炭的电化学性能改善,竹炭粉添加量为30%时制备的活性炭电化学性能最佳,比表面积为2976 m^(2)/g,总孔容积为1.59 cm^(3)/g,相较不添加竹炭粉时增加了59%,中孔率达15.6%。在0.05 A/g电流密度下比电容达377.9 F/g,比不添加竹炭粉时比电容提高了69.9%,在5 A/g电流密度下电容保持率为84.34%,在1 A/g电流密度下循环1000次后电容保持率为86.71%,相较不添加竹炭粉时提高了4.99%,倍率性和循环稳定性良好。

The activated carbons for EDLC were prepared from lignite based ashless coal and bamboo charcoal powder with KOH as an activator.The structure of the activated carbons were characterized by XRD,SEM,N_(2)adsorption and FT-IR.Electrochemical properties were tested by GCD,CV and EIS.The results shows that the electrochemical performance of the activated carbon prepared by adding bamboo powder into lignite based ashless coal is improved,and the optimum addition of bamboo charcoal powder is 30%.The specific surface area reached 2976 m^(2)/g,which is 59%higher than that no bamboo charcoal powder addition.The total hole volume is 1.59 cm^(3)/g,with a mesopore ratio of 15.6%.The specific capacitance reached 377.9 F/g,which increased 69.9%in specific capacitance.The capacitance retention is 84.34%at 5 A/g.The capacitance retention is 86.71%after 1000 cycles,which shows perfect ratio characteristics and cycling stability.