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A universal strategy towards porous carbons with ultrahigh specific surface area for high-performance symmetric supercapacitor applications

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Abstract

Porous carbons with ultrahigh specific surface area (> 3000 m2/g) prepared at low KOH/char ratio (e.g. less than 0.5) is of great importance for their future applications, yet this remains a significant challenge due to the uneven dispersion of the activating agent within carbon source. Herein, a universal combination strategy (solid-state reaction at room temperature followed by chemical activation) to prepare ultrahigh surface area porous carbons has been developed. The specific surface area can reach to 3775 m2/g even at a very low KOH/char ratio (0.19), and the morphologies, specific surface and pore size distributions of the products can be simply tuned by the KOH/char ratios. We found the solid-state reaction at room temperature prior to chemical activation is an efficient way to achieve the even dispersion of the activating agent and thus improve the utilization of KOH greatly. As a typical example, the as-obtained EDTA-3 K not only have an ultrahigh specific surface area up to 3614 m2/g, but also deliver a large total pore volume of 2.09 m3/g. Benefited from the ultrahigh specific surface area, hierarchically porous structure and unique morphology, the EDTA-3 K based supercapacitor exhibits excellent capacitive performance in both KOH and Li2SO4 electrolyte. Hence, this study not only exploits a new approach for the synthesis of hierarchically porous carbon materials with ultrahigh specific surface area for electrochemical energy storage applications, but also provides a universal combination strategy to improve the utilization ratio of activating reagent for the producing of porous carbons.

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Acknowledgements

The authors are grateful to the financial supports from the Scientific Research Foundation of the Higher Education Institutions of Ningxia (Grant No. NGY 2017148).

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  1. College of Materials Science and Engineering, North Minzu University, Yinchuan, 750021, People’s Republic of China

    Honghuo Liang, Tao Sun, Lang Xu, Chaoying Sun & Dewei Wang

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Liang, H., Sun, T., Xu, L. et al. A universal strategy towards porous carbons with ultrahigh specific surface area for high-performance symmetric supercapacitor applications. J Mater Sci: Mater Electron 30, 13636–13646 (2019). https://doi.org/10.1007/s10854-019-01733-y

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