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N, O self-codoped hierarchical porous carbon from chitosan for supercapacitor electrode active materials

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Abstract

The oxygen and nitrogen self-codoped activated carbon nanosheets are facilely prepared from chitosan by using ZnCl2. The optimal carbon possesses a significantly increased specific surface area (SBET = 1679 m2 g− 1) and richer porosity (Vp = 0.792 cm3 g− 1) in comparison with the pristine carbon prepared without using ZnCl2 (Vp = 0.035 cm3 g− 1, SBET = 80 m2 g− 1). The well-developed hierarchical porous structure and high heteroatom contents (N 7.35 at%, O 8.96 at%) endow the optimal carbon superior capacitive performance. It delivers a specific capacitance of 287.94 F g− 1 at 1.0 A g− 1 in the three-electrode supercapacitors. Moreover, the optimal carbon-based symmetric supercapacitor achieves an energy density of 28.74 Wh kg− 1 when the power density is 399.92 W kg− 1, and demonstrates satisfactory cycling stability. Our work provides an effective way for fabricating heteroatom self-doped porous carbon materials for advanced electrochemical energy storage devices.

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Acknowledgments

This work is financially supported by the National Natural Science Foundation of China (CN) (No. U1304203), the 111 Project (CN) (No. B12015), the Natural Science Foundation of Henan Province (CN) (No. 162300410258), and the College Students Innovation and Entrepreneurship Training Program of ZZU (CN) (No. 2020cxcy014).

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X-LZ: Methodology, conceptualization, writing-original draft; C-NF: methodology, formal analysis, writing-original draft; H-PL: investigation, formal analysis; X-CZ: supervision, writing-review and editing.

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Correspondence to Xiu-Cheng Zheng.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Zhang, XL., Feng, CN., Li, HP. et al. N, O self-codoped hierarchical porous carbon from chitosan for supercapacitor electrode active materials. Cellulose 28, 437–451 (2021). https://doi.org/10.1007/s10570-020-03536-5

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  • DOI: https://doi.org/10.1007/s10570-020-03536-5

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