Abstract
A three-dimensional (3D) fluorine-doped graphene aerogel (FGA) with rich semi-ionic C–F bonds was synthesized via a facile hydrothermal method and applied as the electrode material in supercapacitor. A porous 3D network structure with a high specific surface area of the FGA has been confirmed by the combination of scanning electron microscopy, transmission electron microscopy and N2 adsorption method. X-ray photoelectron spectroscopy spectra indicated that the FGA was doped predominantly with semi-ionic C–F bonds, which ensured the high electronic conductivity and sufficient electrochemistry active sites of FGA. As a result, the FGA electrode showed a high specific capacity of 279.8 F g−1 at a current density of 0.5 A g−1, which is much better than that of undoped graphene aerogel (UGA, 141.6 F g−1). Even though the current density increased to 10 A g−1, 90.6% of its specific capacitance was retained. The FGA also maintained about 94.3% of the initial capacitance after 5000 cycles at a current density of 0.5 A g−1. Furthermore, the assembled FGA//FGA symmetric supercapacitor presented a high energy density of 26.2 W h kg−1 at a power density of 899 W kg−1. Accordingly, this work offers a facile and efficient approach to produce fluorine-doped graphene materials for high-performance supercapacitor applications.
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Acknowledgements
The authors thank the financial support by Foundation of Jiangxi Educational Committee (GJJ170427, GJJ170437), the NSF of Jiangxi (20181BAB203012), Foundation of East China University of Technology under Grant No. DHBK2016110 and the Innovation Fund Designated for Graduate Students of East China University of Technology (DHYC-201914).
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Jin, T., Chen, J., Wang, C. et al. Facile synthesis of fluorine-doped graphene aerogel with rich semi-ionic C–F bonds for high-performance supercapacitor application. J Mater Sci 55, 12103–12113 (2020). https://doi.org/10.1007/s10853-020-04821-1
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DOI: https://doi.org/10.1007/s10853-020-04821-1