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Design and preparation of graphene/Fe2O3 nanocomposite as negative material for supercapacitor

The development of high specific capacitance electrode mate-rials with high efficiency, scalability and economic feasibility is significant for the application of supercapacitors, however, the synthesis of electrode material still faces huge challenges. Herein, graphene(G)/Fe2O3 nanocomposite was prepared via a sim-ple hydrothermal method connected with subsequent thermal re-duction process. SEM and TEM results showed rod-like Fe2O3 nano-particles were prepared and well-dispersed on graphene layers, providing a rich active site and effectively buffered the aggregation of Fe2O3 nanoparticles in the process of electrochemical reaction. The specific capacitance of obtained G/Fe2O3 nanocomposite as negative electrode for supercapacitor was 378.7 F g-1 at the current density of 1.5 A g-1, and the specific capacitance retention was 88.76% after 3000 cycles. Furthermore, the asymmetric superca-pacitor (ASC) was fabricated with G/Fe2O3 nanocomposite as nega-tive electrode, graphene as positive electrode, which achieved a high energy density of 64.09 W h kg-1 at a power density of 800.01 W kg-1, maintained 30.07 W h kg-1 at a power density of 8004.89 W kg-1, and retained its initial capacitance by 78.04% after 3000 cycles. The excellent result offered a promising way for G/Fe2O3 nanocom-posite to applied in high energy density storage systems.   

  1. 1 School of Biology and Chemistry Engineering, Panzhihua University, Pan-zhihua, 617000, China.
    2 School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China
    3 College of Materials Science and Engineering, Heilongjiang University of Science and Technology, Harbin, 150022, China
  • Received:2021-11-02 Revised:2021-11-28 Accepted:2021-11-30 Online:2021-11-30 Published:2021-11-30
  • Contact: LI Zhenyu zhenyu.li@swpu.edu.cn GAO Wei ttgg2011@126.com
  • Supported by:
    the National Natural Science Foundation of China (No. 52073238), Science and Technology Planning Project in Panzhihua City, China (No. 2021ZD-G-10), and University Nursing Program for Young Schol-ars with Creative Talents in Heilongjiang Province, China (No. UNPYSCT-2018092).

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Abstract: The development of high specific capacitance electrode mate-rials with high efficiency, scalability and economic feasibility is significant for the application of supercapacitors, however, the synthesis of electrode material still faces huge challenges. Herein, graphene(G)/Fe2O3 nanocomposite was prepared via a sim-ple hydrothermal method connected with subsequent thermal re-duction process. SEM and TEM results showed rod-like Fe2O3 nano-particles were prepared and well-dispersed on graphene layers, providing a rich active site and effectively buffered the aggregation of Fe2O3 nanoparticles in the process of electrochemical reaction. The specific capacitance of obtained G/Fe2O3 nanocomposite as negative electrode for supercapacitor was 378.7 F g-1 at the current density of 1.5 A g-1, and the specific capacitance retention was 88.76% after 3000 cycles. Furthermore, the asymmetric superca-pacitor (ASC) was fabricated with G/Fe2O3 nanocomposite as nega-tive electrode, graphene as positive electrode, which achieved a high energy density of 64.09 W h kg-1 at a power density of 800.01 W kg-1, maintained 30.07 W h kg-1 at a power density of 8004.89 W kg-1, and retained its initial capacitance by 78.04% after 3000 cycles. The excellent result offered a promising way for G/Fe2O3 nanocom-posite to applied in high energy density storage systems.

Key words: Graphene, Fe2O3, Electrode material, Supercapacitor

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