Abstract
In this investigation, nitrogen and sulfur co-doped graphene hydrogel (N,S-GH) with well-connected hierarchical networks was prepared using a simple one-step process. The hierarchical structures provide electrically conductive channels for ion transfer, whereas N,S heteroatoms improve the chemical reactivity and pseudocapacitance of the electrode material. An optimized N,S-GH as a bind-free supercapacitor electrode demonstrates a large gravimetric capacitance (294.8 F g−1 at 1 A g−1), long lifetime (89.4% retention after 10,000 cycles), and excellent rate capability, twice as that of pure GH due to the synergistic effect of N and S doping. Therefore, a large capacitance of the optimized N,S-GH is ascribed to fast ion diffusion, large accessible area (hierarchical network), and pseudocapacitance (N and S co-doping). Furthermore, the optimized N,S-GH-based supercapacitor delivers a high energy density (8.6 Wh kg−1) at a high power density (2.4 kW kg−1). Overall, the obtained N,S-GH through this investigation presents a promising electrode material with outstanding electrochemical properties for energy storage applications.
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The authors acknowledge the financial support of National Natural Science Foundation of China (11890674).
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Dang, F., Zhao, W., Yang, P. et al. Nitrogen and sulfur co-doped hierarchical graphene hydrogel for high-performance electrode materials. J Appl Electrochem 50, 463–473 (2020). https://doi.org/10.1007/s10800-020-01404-5
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DOI: https://doi.org/10.1007/s10800-020-01404-5