Abstract
Heteroatom-doped porous carbons with hierarchical structures have been regarded as promising electrode materials for high-performance supercapacitors. Herein N, S co-doped hierarchically porous carbon (NSHPC) was synthesized by a molten-salt templated method using eutectic KCl/LiCl as the template, chitosan as the carbon/nitrogen source, and K2SO4 as the sulfur source, respectively. The as-prepared NSHPC exhibits a large specific surface area of 994.2 m2 g−1 with hierarchical pores of 1.6, 2.5, and 3.7 nm in diameter, as well as high heteroatom content with 4.5% of N and 10.2% of S elements. Consequently, the NSHPC electrode delivers high specific capacitances of 277 F g−1 at a scan rate of 25 mV s−1, and 195 F g−1 at a current density of 10 A g−1, and also retains a 48.9% retention when the current density is increased to 50 A g−1. Moreover, the electrode also remains 87.4% of initial capacitance after submitting 5000 charge/discharge cycles at 10 A g−1.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant Nos. 51673061 and 51973235) and the Fundamental Research Funds for the Central Universities (Grant No. Grants CZP19001).
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Deng, S., He, C., Qiu, S. et al. Molten-salt-templated fabrication of N, S co-doped hierarchically porous carbons for high-performance supercapacitors. J Mater Sci: Mater Electron 31, 10113–10122 (2020). https://doi.org/10.1007/s10854-020-03557-7
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DOI: https://doi.org/10.1007/s10854-020-03557-7