The preparation of biomass-derived porous carbon having a high specific surface area for high-performance supercapacitors has been recognised as an important research topic in the past decade. In this study, chestnut-pulp-derived porous carbon is prepared by employing a two-step process involving carbonisation and KOH chemical activation for the first time. The synthesized hierarchical porous carbon samples have an ultra-high specific surface area of 2646 m² g⁻¹ and good conductivity, and their O-doping can be controlled. They exhibit excellent electrochemical performance as carbon electrodes owing to the synergistic effects of their advantageous features. In a three-electrode system, the as-obtained electrode yields a high specific capacitance of 373 F g⁻¹ at 0.5 A g⁻¹ in 6 M KOH electrolyte. Furthermore, it exhibits excellent rate performance with ~70.8% capacity retention when the discharge current increases from 1 to 10 A g⁻¹ and prominent cycling stability with ~99.7% capacity retention after 10000 cycles. These values indicate that chestnut-pulp-based carbon materials have excellent electrochemical properties when used as supercapacitor electrodes and may promote the large-scale application of 3D porous carbons in energy storage.

用于高性能超级电容器的具有高比表面积的生物质衍生多孔碳的制备已被公认为过去十年的重要研究课题。在这项研究中，首次采用碳化和 KOH 化学活化的两步法制备了板栗果肉衍生的多孔碳。合成的分级多孔碳样品具有2646 m ²  g ^-1的超高比表面积和良好的导电性，并且它们的O掺杂可以控制。由于其优势特性的协同效应，它们作为碳电极表现出优异的电化学性能。在三电极系统中，所获得的电极产生了 373 F g ^-1的高比电容 在 0.5 A g ^-1的 6 M KOH 电解液中。此外，它表现出优异的倍率性能，当放电电流从 1 增加到 10 A g ^-1时容量保持率约为 70.8%，并且循环稳定性出色，10000 次循环后容量保持率约为 99.7%。这些值表明，栗木浆基碳材料在用作超级电容器电极时具有优异的电化学性能，可能会促进 3D 多孔碳在储能方面的大规模应用。