Self-assembling graphene-anthraquinone-2-sulphonate supramolecular nanostructures with enhanced energy density for supercapacitors

Nanotechnology
Lifang GaoLi Niu

Abstract

Boosting the energy density of capacitive energy storage devices remains a crucial issue for facilitating applications. Herein, we report a graphene-anthraquinone supramolecular nanostructure by self-assembly for supercapacitors. The sulfonated anthraquinone exhibits high water solubility, a π-conjugated structure and redox active features, which not only serve as a spacer to interact with and stabilize graphene but also introduce extra pseudocapacitance contributions. The formed nest-like three-dimensional (3D) nanostructure with further hydrothermal treatment enhances the accessibility of ion transfer and exposes the redox-active quinone groups in the electrolytes. A fabricated all-solid-state flexible symmetric device delivers a high specific capacitance of 398.5 F g(-1) at 1 A g(-1) (1.5 times higher than graphene), superior energy density (52.24 Wh kg(-1) at about 1 kW kg(-1)) and good stability (82% capacitance retention after 10 000 cycles).

References

May 8, 2010·Chemical Communications : Chem Comm·Xufeng Zhou, Zhaoping Liu
Nov 10, 2010·Nano Letters·Chenguang LiuBor Z Jang
Aug 1, 2013·Advanced Materials·Yuxi XuXiangfeng Duan
Feb 4, 2014·Advanced Materials·Minah LeeChan Beum Park
Mar 15, 2014·Science·Patrice SimonBruce Dunn
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Mar 3, 2015·Advanced Materials·Hua WangXiaodong Chen
Jan 23, 2016·Journal of the American Chemical Society·Shiyu GanLi Niu
Sep 8, 2016·Nature Communications·Maria R LukatskayaYury Gogotsi

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