| 电化学阻抗解析多壁碳纳米管/活性炭的电化学性能 |
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| 引用本文： | 耿新,李峰,王大伟,成会明.电化学阻抗解析多壁碳纳米管/活性炭的电化学性能[J].新型炭材料,2011,26(4). |
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| 作者姓名： | 耿新 李峰 王大伟 成会明 |
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| 作者单位： | 1. 辽宁科技大学化工学院,辽宁鞍山114051;中国科学院金属研究所沈阳材料科学国家(联合)实验室,辽宁沈阳110016
2. 中国科学院金属研究所沈阳材料科学国家(联合)实验室,辽宁沈阳,110016 |
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| 基金项目： | 辽宁省教育厅科学基金(2008330); 中国科学院王宽诚教育基金~~ |
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| 摘 要： | 以石油焦为原料化学活化制得活性炭(Activated carbon,AC),在此AC中加入不同量的多壁碳纳米管(Multi-walled carbon nanotubes,MWCNTs)作为超级电容器电极材料.依据交流阻抗谱中阻抗与电容关系,区分有效容量和内阻造成的能量损失,评价了超级电容器的性能.结果表明:加入质量分数3％～15％ MWCNTs的AC电极,实部电容高于纯AC电极,虚部电容则随着MWCNTs添加量的增加而显著降低.且其实部电容分数随MWCNTs加入量的增加呈上升趋势,虚部电容分数则随MWCNTs加入量增加而降低.在AC电极中加入MWCNTs,在降低电极内阻的同时可有效提高超级电容器的储能效率,并降低弛豫时间,提高其频率特性,改善电容行为.
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| 关 键 词： | 活性炭 多壁碳纳米管 电化学阻抗谱 弛豫时间常数 |
The electrochemical performance of a multi-wall carbon nanotube/activated carbon mixture as the electrode of electric double layer capacitors analyzed by electrochemical impedance |
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| GENG Xin,LI Feng,WANG Da-wei,CHENG Hui-ming.The electrochemical performance of a multi-wall carbon nanotube/activated carbon mixture as the electrode of electric double layer capacitors analyzed by electrochemical impedance[J].New Carbon Materials,2011,26(4). |
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| Authors: | GENG Xin LI Feng WANG Da-wei CHENG Hui-ming |
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| Affiliation: | GENG Xin1,2,LI Feng2,WANG Da-wei2,CHENG Hui-ming2(1.University of Science and technology Liaoning,School of Chemical Engineering,Applied Chemistry Department,Anshan114015,China,2.Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang110016,China) |
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| Abstract: | Activated carbon was prepared from petroleum coke by chemical activation.Multi-walled carbon nanotubes(MWCNTs) were mixed with the activated carbon to form the electrode material of electric double layer capacitors.According to the relative values of impedance and capacitance in electrochemical impedance,the available capacitance and energy dissipation from resistance were evaluated.Results showed that the real part of the capacitance for this mixture was higher than for activated carbon alone when activate... |
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| Keywords: | Activated carbon Multi-walled carbon nanotubes Electrochemical impedance spectroscopy Relaxation time constant |
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