Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6602504 | Electrochimica Acta | 2018 | 21 Pages |
Abstract
Interconnected three-dimension (3D) networks of novel helical carbon nanotubes (HCNTs) wrapped with reduced graphene oxide nanosheets (HCNTs/rGO) are successfully fabricated via a facile solution of self-assembly method, as well as a robust process for the simultaneous reduction and high N-doping of HCNTs/rGO composites (N-HCNTs/rGO) by photoreduction under NH3 atmosphere. The as-prepared N-HCNTs/rGO are directly employed as binder-free supercapacitor electrodes, and exhibit a highly conductive 3D-interconnected structure (5.85â¯Sâ¯cmâ1), large surface area (528.9â¯m2â¯gâ1), low internal resistance (0.5â¯Î©), and good wettability. As a result, N-HCNTs/rGO show high specific capacitance (368â¯Fâ¯gâ1), high energy density (12.8â¯Wh kgâ1), and cycling stability (90.7% retention at 1â¯Aâ¯gâ1 for 5000 cycles) in two-electrode systems. Moreover, the 3D N-HCNTs/rGO hybrid networks exhibit enhanced electrochemical performance in supercapacitors, which combine the synergistic effects of the two carbon nanostructures, enhanced wettability, low internal resistance, and improved ion-diffusion ability, together with the large surface areas of 3D hybrid networks and high-level N-doping. The as-synthesized composite is a potential candidate for flexible and binder-free electrodes for high-performance supercapacitors.
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Physical Sciences and Engineering
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Authors
Xinyu Li, Yongjie Xu, Guanghui Hu, Zhangbin Luo, Dandan Xu, Tao Tang, Jianfeng Wen, Ming Li, Taoyun Zhou, Yun Cheng,