Research Article


2021, 14(4): 953–960


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, and Xiangrong Yu5 (✉)

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1 College of Mathematics and Physics, Shanghai University of Electric Power, Shanghai 200090, China
2 Key Lab for Special Functional Materials of Ministry of Education, School of Materials Science and Engineering, Henan University, Kaifeng 475004, China
3 Department of Physics, Fudan University, Shanghai 200433, China
4 Department of Physics, Shaoxing University, Shaoxing 312000, China
5 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.

Keywords: graphene, heterostructures, amorphous Fe2O3, Co3O4, all-solid-state asymmetric supercapacitors
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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.
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Rational design of novel ultra-small amorphous Fe2O3 nanodots/ graphene heterostructures for all-solid-state asymmetric supercapacitors. Nano Res. 2021, 14(4): 953–960

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