4.7 Article

Precisely tailoring pore structure in sunflower plate-derived N, O co-doped carbons for high-performance supercapacitors

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ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2023.05.038

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Biomass; Electrochemical performance; Pore structure; Supercapacitors

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A versatile K2CO3 activation approach is proposed to adjust and control the pore structure of sunflower plate-derived hierarchical porous carbon materials. The specific surface area of the optimal material is 2526 m2/g, and it exhibits superior capacitance activity. The assembled supercapacitors also demonstrate high energy density in different electrolyte solutions.
The controllable adjustment of pore structure is of great significance for the high capacitive performance of porous carbon materials. In this research, a versatile K2CO3 activation approach is proposed to adjust and control the porosity of sunflower plate-derived hierarchical porous carbon materials (HPC-x) by controlling the K2CO3/carbons mass ratio. Notably, the variety of pore types, including micropores, mesopores and macropores, can be detected at different K2CO3/carbons mass ratios (0 ti 4). Impressively, the specific surface area of optimal HPC-2 material is 2526 m2/g. Compare with the other samples (HPC-1, HPC-3 or HPC-4), the HPC-2 possess superior capacitance activity (369.4 F/g at 0.5 A/g). On top of that, the energy density of HPC-2 assembled supercapacitors in 1 M Na2SO4 and 6 M KOH solutions can even reach 32.6 and 7.3 Wh/kg, respectively.& COPY; 2023 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.

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