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Research Article

Rational design of novel ultra-small amorphous Fe2O3 nanodots/ graphene heterostructures for all-solid-state asymmetric supercapacitors

Chenxiao Wu1,2,§, Zhifang Zhang3,§, Zhonghui Chen2( ), Zuimin Jiang3, Huiyu Li1, Haijing Cao1, Yongsheng Liu1, Yanyan Zhu1( ), Zebo Fang4, Xiangrong Yu5( )
College of Mathematics and Physics, Shanghai University of Electric Power, Shanghai 200090, China
Key Lab for Special Functional Materials of Ministry of Education, School of Materials Science and Engineering, Henan University, Kaifeng 475004, China
Department of Physics, Fudan University, Shanghai 200433, China
Department of Physics, Shaoxing University, Shaoxing 312000, China
Department of Medical Imaging, Zhuhai People’s Hospital, Zhuhai Hospital affiliated with Jinan University, Zhuhai 519000, China

§ Chenxiao Wu and Zhifang Zhang contributed equally to this work.

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Abstract

Constructing graphene-based heterostructures with large interfacial area is an efficient approach to enhance the electrochemical performance of supercapacitors but remains great challenges in their synthesis. Herein, a novel ultra-small amorphous Fe2O3 nanodots/graphene heterostructure (a-Fe2O3 NDs/RGO) aerogel was facilely synthesized via excessive metal-ion-induced self-assembly and subsequent calcination route using Prussian blue/graphene oxide (PB/GO) composite aerogel as precursors. The deliberately designed a-Fe2O3 NDs/RGO heterostructure offers a highly interconnected porous conductive network, large heterostructure interfacial area, and plenty of accessible active sites, greatly facilitating the electron transfer, electrolyte diffusion, and pseudocapacitive reactions. The obtained a-Fe2O3 NDs/RGO aerogel could be used as flexible free-standing electrodes after mechanical compression, which exhibited a significantly enhanced specific capacitance of 347.4 F·g−1 at 1 A·g−1, extraordinary rate capability of 184 F·g−1 at 10 A·g−1, and decent cycling stability. With the as-prepared a-Fe2O3 NDs/RGO as negative electrodes and the Co3O4 NDs/RGO as positive electrodes, an all-solid-state asymmetric supercapacitor (a-Fe2O3 NDs/RGO//Co3O4 NDs/RGO asymmetric supercapacitor (ASC)) was assembled, which delivered a high specific capacitance of 69.1 F·g−1 at 1 A·g−1 and an impressive energy density of 21.6 W·h·kg−1 at 750 W·kg−1, as well as good cycling stability with a capacity retention of 94.3% after 5,000 cycles. This work provides a promising avenue to design high-performance graphene-based composite electrodes and profound inspiration for developing advanced flexible energy-storage devices.

Keywords

grapheneheterostructuresamorphous Fe2O3Co3O4all-solid-state asymmetric supercapacitors

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Nano Research
Volume 14 Issue 4,
April 2021
Pages 953-960
DOI: 10.1007/s12274-020-3131-z
Cite this article:
Wu C, Zhang Z, Chen Z, et al. Rational design of novel ultra-small amorphous Fe2O3 nanodots/ graphene heterostructures for all-solid-state asymmetric supercapacitors. Nano Research, 2021, 14(4): 953-960. https://doi.org/10.1007/s12274-020-3131-z
Topics:
AerogelsCapacitanceElectrodesElectrolytesEnergy storageGrapheneMetal ionsMetalsNanodots Supercapacitor

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Received: 19 July 2020
Revised: 06 September 2020
Accepted: 20 September 2020
Published: 12 November 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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