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OALib Journal期刊
ISSN: 2333-9721
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双电层电容器用新型无灰煤(hypercoal)基活性炭的制备
, PP. 539-544
Keywords: 无灰煤,双电层电容器,活性炭,比表面积,电容
Abstract:
？以无灰煤（hypercoal）为原料，koh和caco3为活化剂制备了煤基活性炭，采用低温n2吸附法表征了活性炭的比表面积和孔结构，测定了活性炭用作双电层电容器（edlc）电极材料的电化学性能。考察了炭化温度、活化温度、活化时间和活化剂对活性炭电容特性的影响。研究结果表明，比表面积和比电容随着炭化温度的升高而降低，活化温度过高或活化时间太长对比电容有不利影响。此外，caco3影响活化过程中孔的开发，显著降低所制备活性炭的比表面积和比电容。在炭化温度为500℃、活化温度为800℃、koh与焦的质量比为4：1和活化时间2h下所得活性炭的比表面积和总孔容分别达到2540m2/g和1.65cm3/g，该活性炭电极在0.5mol/lteabf4/pc电解液中的比电容达到最大值46.0f/g。
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