Abstract
Recently, layered double hydroxides (LDHs) have attracted intensive research interest as the next-generation supercapacitor electrodes due to their unique two-dimensional (2D) hydrotalcite-like structure. However, the inevitable agglomeration significantly decreases the accessible surface areas and blocks the pseudocapacitive sites, thus severely hinders their electrochemical applications. Herein, we develop a facile one-step growth approach to fabricate porous agglomerate of NiCo-LDH nanosheets and reduced graphene oxide (rGO) nanoflakes. By adjusting feeding molar ratios, the obtained NiCo-LDH/rGO electrode delivers a high specific capacity of 879.5 C/g at a current density of 0.5 A/g and still remains 485 C/g at 20 A/g. Furthermore, the fabricated asymmetric supercapacitor (ASC) has demonstrated a superior energy density of 48.7 W h/kg at a power density of 401 W/kg. After 2000 cycles, the assembled ASC exhibits an improved capacity retention of 81% within a potential window of 1.6 V at 2 A/g.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (No. 21908090) and key youth program of Natural Science Foundation of Jiangxi Province (No. 20192ACB21015). The authors would like to acknowledge the support from the Nanchang University and Arizona State University.
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Liu, L., Liu, A., Xu, Y. et al. Agglomerated nickel–cobalt layered double hydroxide nanosheets on reduced graphene oxide clusters as efficient asymmetric supercapacitor electrodes. Journal of Materials Research 35, 1205–1213 (2020). https://doi.org/10.1557/jmr.2020.39
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DOI: https://doi.org/10.1557/jmr.2020.39