Abstract Nitrogen-doped porous carbon materials with controllable pore sizes are selectively prepared via carbonization of banana sheets combined with KOH activation. The resulting carbon materials, featured with a well-designed pore size distribution, high specific surface area, exhibits excellent capacitive performance in aqueous electrolyte (264 F/g at 1 A/g). More importantly, the symmetric supercapacitor exhibited a maximum specific capacitance of 155 F/g and a corresponding energy density of 48.44 Wh/kg at a current density of 1 A/g in organic electrolyte. Further investigation revealed that the enhanced supercapacitance is attributed to the pore size (especially in the range of 0.9–1.2 nm) and N-doped. The prepared carbon also displays an excellent CO2 adsorption ability due to the suitable pore size distribution as high as 5.29 mmol/g and 4.16 mmol/g at 0 °C and 25 °C under 1 bar, respectively. The present investigation will provide a new avenue for the wide application of biomass-derived porous carbon in various fields.

中文翻译：

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深入了解 N 掺杂多孔碳材料对电化学储能和 CO2 吸附的孔径分布

摘要 通过香蕉片碳化结合KOH活化选择性制备了孔径可控的氮掺杂多孔碳材料。所得碳材料具有精心设计的孔径分布、高比表面积，在水性电解质中表现出优异的电容性能（1 A/g 时为 264 F/g）。更重要的是，对称超级电容器在有机电解质中在 1 A/g 的电流密度下表现出 155 F/g 的最大比电容和 48.44 Wh/kg 的相应能量密度。进一步的研究表明，增强的超级电容归因于孔径（特别是在 0.9-1.2 nm 的范围内）和 N 掺杂。由于合适的孔径分布高达 5，所制备的碳还显示出优异的 CO2 吸附能力。在 0 °C 和 25 °C 和 1 bar 下分别为 29 mmol/g 和 4.16 mmol/g。本研究将为生物质衍生多孔碳在各个领域的广泛应用提供新的途径。