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材料工程  2009 

活化条件对酚醛基活性炭布结构及其电化学性能的影响

, PP. 14-19

Keywords: 活性炭布,水蒸气活化,孔结构,电化学性能

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Abstract:

以实验室自制的酚醛基纤维布为原料,通过水蒸气活化制备了系列酚醛基活性炭布(ACCs),利用低温N2(77K)吸附法测定了所制活性炭布的孔结构,将所制备的活性炭布用做超级电容器电极材料,用恒流充放电法和交流阻抗技术考察了所制模拟电容器的电化学性能(电解液1M(CH2CH3)3CH3NBF4/PC)。结果表明随着活化温度的升高或活化时间的延长,所制活性炭布的比表面积和平均孔径增大,中孔比表面积也得到明显提高。活性炭布的比电容随着比表面积的增加而增大,其中950℃活化90min的样品在50mA·g-1电流密度下的比电容达到158F·g-1。电容保持率(C500/C50)随着样品中孔比表面积的增加而增大,900℃活化120min的样品的电容保持率达到91.1%;随着平均孔径的增大,表征电极导电性的参数IR降减小。

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