超级电容器活性炭电极循环伏安特性
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摘要
针对活性炭电极超级电容器性能偏低的问题,依据双电层电容器工作原理,以活性炭、乙炔黑、质量分数为15%的聚四氟乙烯、异丙醇为原料,采用粉末压片技术,制备了活性炭质量分数分别为60%、65%、70%、75%和80%的超级电容器电极材料。通过扫描速率分别为5 mV/s、10mV/s、20 mV/s、50 mV/s、100 mV/s和200 mV/s的循环伏安测试,分析了活性炭电极的比电容、比能量和比功率。结果表明,当活性炭质量分数为70%、扫描速率为5 mV/s时,比电容为189.3 F/g,比能量为26.3 W·h/kg;当活性炭质量分数为70%、扫描速率为20 mV/s时,比功率为916.6 W/kg。确定了电极材料中活性炭的最优配比为70%,为基于活性炭电极的超级电容器制备提供了重要参考。
For the problem of lower performance of supercapacitors based on activated carbon,according to a working principle of an electric double layer capacitor,activated carbon electrodes with mass fractions of 60%,65%,70%,75% and 80% were prepared by a powder compression technology.Activated carbon,acetylene black,PTFE with the mass fraction of 15% and isopropanol were used as raw materials.The specific capacitance,the specific energy and the specific power of the activated carbon electrodes were analyzed through cyclic voltammetry tests with scanning rates at 5 mV/s,10 mV/s,20 mV/s,50 mV/s,100 mV/s and 200 mV/s.The results show that the specific capacitance is 189.3 F/g and the specific energy is 26.3 W·h/kg when the mass fraction of activated carbon is 70% and the scanning rate is 5 mV/s.The specific power is 916.6 W/kg when the mass fraction of activated carbon is 70% and the scanning rate is 20 mV/s.This study confirms the optimal ratio of the mass fraction of activated carbon is 70%,providing an important reference for preparation of supercapacitors based on activated carbon electrodes.
For the problem of lower performance of supercapacitors based on activated carbon,according to a working principle of an electric double layer capacitor,activated carbon electrodes with mass fractions of 60%,65%,70%,75% and 80% were prepared by a powder compression technology.Activated carbon,acetylene black,PTFE with the mass fraction of 15% and isopropanol were used as raw materials.The specific capacitance,the specific energy and the specific power of the activated carbon electrodes were analyzed through cyclic voltammetry tests with scanning rates at 5 mV/s,10 mV/s,20 mV/s,50 mV/s,100 mV/s and 200 mV/s.The results show that the specific capacitance is 189.3 F/g and the specific energy is 26.3 W·h/kg when the mass fraction of activated carbon is 70% and the scanning rate is 5 mV/s.The specific power is 916.6 W/kg when the mass fraction of activated carbon is 70% and the scanning rate is 20 mV/s.This study confirms the optimal ratio of the mass fraction of activated carbon is 70%,providing an important reference for preparation of supercapacitors based on activated carbon electrodes.
引文
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[10]JANG Y,JO J,CHOI Y M,et al.Activated Carbon Nanocomposite Electrodes for High Performance Supercapacitors[J].Electrochimica Acta,2013,102(15):240-245.
[11]ZHAO Yang,LIU J,HU Y,et al.Highly Compression-Tolerant Supercapacitor Based on Polypyrrole-Mediated Graphene Foam Electrodes[J].Advanced Materials,2013,25(4):591-565.
[12]HSU YH,LAI CC,HO CL,et al.Preparation of Interconnected Carbon Nanofibers as Electrodes for Supercapacitors[J].Electrochimica Acta,2014,127(1):369-376.
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[14]AN H F,WANG Y,WANG X,et al.Polypyrrole/carbon Aerogel Composite Materials for Supercapacitor[J].Power Sources,2010,195(19):6964-6969.
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[19]GHOSH A,Lee Y H.Carbon-Based Electrochemical Capacitors[J].Chem Sus Chem,2012,5(3):480-499.
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