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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