Tunable self-discharge process of carbon nanotube based supercapacitors
Tunable self-discharge process of carbon nanotube based supercapacitors
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DOI：
10.1016/j.nanoen.2013.12.005
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发表时间：
2014-03
期刊：
影响因子：
17.6
通讯作者：
Qing Zhang;C. Cai;Jinwen Qin;B. Wei
中科院分区：
文献类型：
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作者：
Qing Zhang;C. Cai;Jinwen Qin;B. Wei
超级电容器的自放电调节是延长其能量保持的关键，如果可以控制自放电过程，这将显著有利于其在能量存储中的应用。这份关于用单壁碳纳米管（SWNT）构建的超级电容器的自放电机制的报告通过干扰电解质离子和SWNT表面之间的静电相互作用来演示表面化学对自放电的影响，并探讨了自放电过程的可调谐性。实验结果给出了良好的自放电性能之间的相关性和电极表面的官能团的浓度。自放电过程达到充电电压一半所需的时间延长约5倍，官能团减少约13%。因此，通过简单地修整纳米管的表面化学性质，调节单壁碳纳米管超级电容器的自放电速率是可行的。
Self-discharge tuning of supercapacitors is critical in prolonging their energy retention, which would significantly benefit their applications in energy storage if the self-discharge process can be controlled. This report on self-discharge mechanisms of supercapacitors built with single-walled carbon nanotubes (SWNTs) demonstrates the effects of surface chemistry on self-discharge by interfering in the electrostatic interaction between electrolytic ions and the SWNT surface and also explores the tunability of the self-discharge process. Experimental results give decent correlation between the self-discharge performance and the concentration of functional groups attached to the electrode surface. The time the self-discharge process takes to reach half of the charged voltage is extended by ~5 times with functional group decreasing by ~13%. Tuning of the self-discharge rate is therefore feasible for the SWNT supercapacitors by simply trimming the surface chemistry of the nanotubes.