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Research Article

Nanocellulose/nitrogen and fluorine co-doped graphene composite hydrogels for high-performance supercapacitors

Yong Zhang1,2( ), Qingyun Zhou1,2, Wenhui Ma3, Chaohui Wang1,2, Xuefeng Wang4, Jiajun Chen1,2, Tiantian Yu1,2, Shan Fan1,2( )
College of Materials Science and Engineering, Graphene Functional Materials Research Laboratory, Qiqihar University, Qiqihar 161006, China
College of Materials Science and Engineering, Heilongjiang Province Key Laboratory of Polymeric Composition Material, Qiqihar University, Qiqihar 161006, China
School of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, China
Department of Practice Teaching and Equipment Management, Qiqihar University, Qiqihar 161006, China
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Graphical Abstract

Nanocellulose/nitrogen and fluorine co-doped graphene composite hydrogels based symmetric supercapacitors were assembled. Benefitting from the compact porous structures, medium specific surface area, and large heteroatom content, the as-prepared samples present excellent electrochemical properties.

Abstract

Three-dimensional graphene materials have been studied as typical supercapacitors electrode materials by virtue of their ultra-high specific surface area and good ion transport capacity. However, improvement of the poor volumetric electrochemical performance of these graphene materials has been required although they have high gravimetric energy density. In this work, nanocellulose/nitrogen and fluorine co-doped graphene composite hydrogels (NC-NFGHs) were prepared through a convenient hydrothermal approach utilizing ammonium fluoride as the heteroatom source. Nanocellulose (NC) and high concentration of graphene oxide (GO) were utilized to adjust the structure of NC-NFGHs and increase their packing density. Subsequently, the aqueous symmetric supercapacitor based on NC-NFGH-80 exhibits remarkable gravimetric (286.6 F·g−1) and volumetric (421.3 F·cm−3) specific capacitance at 0.3 A·g−1, good rate performance, and remarkable cycle stability up to 10,000 cycles. Besides, the all-solid-state flexible symmetric supercapacitors (ASSC) fabricated by NC-NFGH-80 also delivered a large specific capacitance of 117.1 F·g−1 at 0.3 A·g−1 and long service life over 10,000 cycles at 10 A·g−1. This compact porous structure and heteroatom co-doped graphene material supply a favorable strategy for high-performance supercapacitors.

Keywords

compact graphene composite hydrogelhigh packing densityN/F co-dopinggravimetric/volumetric performancessupercapacitors

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Nano Research
Volume 16 Issue 7,
July 2023
Pages 9519-9529
DOI: 10.1007/s12274-023-5736-5
Cite this article:
Zhang Y, Zhou Q, Ma W, et al. Nanocellulose/nitrogen and fluorine co-doped graphene composite hydrogels for high-performance supercapacitors. Nano Research, 2023, 16(7): 9519-9529. https://doi.org/10.1007/s12274-023-5736-5
Topics:
Supercapacitor

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Received: 30 March 2023
Revised: 06 April 2023
Accepted: 12 April 2023
Published: 31 May 2023
© Tsinghua University Press 2023
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