Anthraquinone on Porous Carbon Nanotubes with Improved Supercapacitor Performance

作者：Chen Xiao; Wang Huanwen; Yi Huan; Wang Xuefeng^*; Yan Xingru; Guo Zhanhu

来源：Journal of Physical Chemistry C, 2014, 118(16): 8262-8270.

DOI：10.1021/jp5009626

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(-1), the AQ-HPCNTs (mass ratio 7:5) electrode showed an ultrahigh specific capacitance of 710 F g(-1), which is much larger than that of the unmodified HPCNTs (304 F g(-1)). Even at a high discharge current density of 20 A the specific capacitance of the AQ-HPCNTs (mass ratio 7:5) electrode was still as high as 419 F g(-1), indicating an excellent rate capability. Furthermore, all the AQ-HPCNTs electrodes exhibited a long cycle life. Electrochemical behaviors of AQ on the HPCNTs' surface showed a double pair of redox peaks, which are appropriate for two types of pi-pi 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.

• 出版日期2014-4-24
• 单位同济大学