Abstract
The development of high specific capacitance electrode materials 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 simple hydrothermal method connected with subsequent thermal reduction process. Scanning electron microscopy(SEM) and transmission electron microscopy(TEM) results showed rod-like Fe2O3 nanoparticles were prepared and well-dispersed on graphene layers, providing a rich active site and effectively buffering the aggregation of Fe2O3 nanoparticles in the process of electrochemical reaction. The specific capacitance of the obtained G/Fe2O3 nanocomposite as negative electrode for supercapacitor was 378.7 F/g at the current density of 1.5 A/g, and the specific capacitance retention was 88.76% after 3000 cycles. Furthermore, the asymmetric supercapacitor(ASC) was fabricated with G/Fe2O3 nanocomposite as negative electrode, graphene as positive electrode, which achieved a high energy density of 64.09 W·h/kg at a power density of 800.01 W/kg, maintained 30.07 W·h/kg at a power density of 8004.89 W/kg, and retained its initial capacitance by 78.04% after 3000 cycles. The excellent result offered a promising way for the G/Fe2O3 nanocomposite to be applied in high energy density storage systems.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No.52073238), the Science and Technology Planning Project in Panzhihua City, China(No.2021ZD-G-10), and the University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province, China(No.UNPYSCT-2018092).
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Gao, W., Li, Y., Zhao, J. et al. Design and Preparation of Graphene/Fe2O3 Nanocomposite as Negative Material for Supercapacitor. Chem. Res. Chin. Univ. 38, 1097–1104 (2022). https://doi.org/10.1007/s40242-022-1442-1
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DOI: https://doi.org/10.1007/s40242-022-1442-1