Anthraquinone on Porous Carbon Nanotubes with Improved Supercapacitor Performance

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• 作者：Xiao Chen ; Huanwen Wang ; Huan Yi ; Xuefeng Wang ; Xingru Yan ; Zhanhu Guo
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：April 24, 2014
• 年：2014
• 卷：118
• 期：16
• 页码：8262-8270
• 全文大小：619K
• 年卷期：v.118,no.16(April 24, 2014)
• ISSN：1932-7455

文摘

Anthraquinone (AQ) molecules were selected to decorate the lab-made hierarchical porous carbon nanotubes (HPCNTs) to obtain electrode materials (AQ-HPCNTs) for supercapacitors, which showed a remarkable capacitance increment in comparison with pure HPCNTs when tested in 1 M H₂SO₄ aqueous solution. At a current density of 1 A g^鈥?, the AQ-HPCNTs (mass ratio 7:5) electrode showed an ultrahigh specific capacitance of 710 F g^鈥?, which is much larger than that of the unmodified HPCNTs (304 F g^鈥?). Even at a high discharge current density of 20 A g^鈥?, the specific capacitance of the AQ-HPCNTs (mass ratio 7:5) electrode was still as high as 419 F g^鈥?, indicating an excellent rate capability. Furthermore, all the AQ-HPCNTs electrodes exhibited a long cycle life. Electrochemical behaviors of AQ on the HPCNTs鈥?surface showed a double pair of redox peaks, which are appropriate for two types of 蟺鈥撓€ stacking interactions supported by infrared spectra. The excellent capacitive behaviors of the AQ-HPCNTs electrode materials are due to a strong positive synergistic effect between AQ and HPCNTs on the improvement of electrochemical performances.