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Research Article | Open Access

Free-standing flexible graphene-based aerogel film with high energy density as an electrode for supercapacitors

Shijia Yuana, Wei Fana( ), Yanan Jinc, Dong Wanga, Tianxi Liua,b( )
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Innovation Center for Textile Science and Technology, Donghua University, 2999 North Renmin Road, Shanghai, 201620, PR China
Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, PR China
Key Laboratory for Special Functional Materials of Ministry of Education, National & Local Joint Engineering Research Centre for High-efficiency Display and Lighting Technology, School of Materials and Engineering, Collaborative Innovation Centre of Nano Functional Materials and Applications, Henan University, Kaifeng, 475004, PR China
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Abstract

Two-dimensional graphene film exhibits sluggish ion diffusivity while three-dimensional (3D) graphene aerogel has low packing density and poor mechanical flexibility. Consequently, there is an urgent need for graphene-based film with both mechanical robustness and high specific capacitance. Here, we present an easy and scalable strategy for fabricating a free-standing flexible graphene-based aerogel film electrode with a two-layered structure, in which the top layer is an interconnected macroporous reduced graphene oxide/carbon nanotube (RGO/CNT) aerogel, and the bottom layer is a flexible electrospun polyacrylonitrile (PAN) nanofiber membrane. The porous 3D structure of the aerogel provides fast transport of electrolyte ions and electrons, while the nanofiber membrane provides both strong support for the aerogel and mechanical flexibility. Polypyrrole (PPy) can be uniformly loaded on RGO/CNT/PAN (RCP) composite aerogel film to provide pseudocapacitance, and nitrogen-doped RGO/CNT/carbon nanofiber (NRCC) aerogel film can be obtained by further pyrolysis. The resultant RCP@PPy-0.05//NRCC based asymmetric supercapacitor can have a maximum voltage of 1.7 V and a maximum energy density of 60.6 W h kg−1 at 850.2 W kg−1. This indicates that free-standing graphene-based aerogel film can be used in flexible supercapacitors.

Keywords

N-dopingGrapheneSupercapacitorPolypyrroleAerogel film

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Nano Materials Science
Volume 3 Issue 1,
March 2021
Pages 68-74
DOI: 10.1016/j.nanoms.2020.03.003
Cite this article:
Yuan S, Fan W, Jin Y, et al. Free-standing flexible graphene-based aerogel film with high energy density as an electrode for supercapacitors. Nano Materials Science, 2021, 3(1): 68-74. https://doi.org/10.1016/j.nanoms.2020.03.003

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Received: 04 January 2020
Accepted: 25 February 2020
Published: 26 March 2020
© 2020 Chongqing University.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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