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N_2(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(CH_2CH_3)_3CH_3NBF_4/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(C_(500)/C_(50))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.
Phenolic resin based activated carbon cloths(ACCs) were prepared by steam activation treat-ment, and were used as electrodes of supercapacitors. The pore structure and the electrochemical properties of the resultant ACCs were investigated by means of Nz adsorption, AC impedance and con-stant current discharge techniques. The relationship of pore structure and the activated conditions, as well as the relationship between the pore structure and electrochemical performance in 1M (CH_2CH_3)_3CH_3NBF_4/PC were discussed in details. Results showed that the BET surface area, aver-age pore width and mesoporous surface area dramatically increased with the increase of activation tem-perature and/or activation time. It was also found that the specific capacitance of ACCs increased with the increase of BET surface area, especially the specific capacitance of the sample activated under 950"C for 90rain reached 158F · g~(-1) at current density of 50mA · g~(-1). Besides, the capacitance reten-tion of ACCs at high current density increased with the increase of mesoporous surface area, of which the capacitance retention (C_(500)/C_(50)) of the sample with the largest mesoporous specific surface area reached 91.1%. IR drop reduced sharply in the pores less than 2nm with the increase of average pore width.
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