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A universal KOH-free strategy towards nitrogen-doped carbon nanosheets for high-rate and high-energy storage devices

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Abstract

In this work, we report a universal KOH-free strategy to fabricate two-dimensional nitrogen-doped carbon nanosheets from edible oil residues. The saponification process and novel mild activators are introduced for the first time to optimize the microstructure of the nitrogen-doped carbon nanosheets. The resulting carbon nanosheets present a high specific surface area (2470 m2 g−1), wide pore size distribution (0.5–60 nm), and high nitrogen content (4.96%). As electrode materials for supercapacitors, the as-prepared nitrogen-doped carbon nanosheets exhibit a high specific capacitance of 340 F g−1 at a current density of 0.5 A g−1 and retain a high capacitance of 282 F g−1 at a very high current density of 50 A g−1, with no capacitance attenuation seen after 20 000 charge/discharge cycles in 6.0 M KOH electrolyte. The as-fabricated carbon nanosheet-based symmetric cell manifests a maximum energy density of 55.5 W h kg−1 at the power density of 369 W kg−1 and retains a high energy density of 32.3 W h kg−1 at 6180 W kg−1 in 1.0 M LiPF6 electrolyte. Experimental results reveal that this study provides an efficient and universal strategy for novel pre-treatment and KOH-free activation of nitrogen-doped carbon nanosheets with high specific surface area for high-rate and high-energy supercapacitors.

Graphical abstract: A universal KOH-free strategy towards nitrogen-doped carbon nanosheets for high-rate and high-energy storage devices

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Publication details

The article was received on 15 Sep 2019, accepted on 31 Oct 2019 and first published on 31 Oct 2019


Article type: Paper
DOI: 10.1039/C9TA10179A
J. Mater. Chem. A, 2019, Advance Article

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    A universal KOH-free strategy towards nitrogen-doped carbon nanosheets for high-rate and high-energy storage devices

    G. Yuan, W. Huang, K. Guan, H. Li, Y. Xie, Y. Liang, Y. Liu and M. Zheng, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA10179A

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