What question did this study set out to answer?

The aim is to create high-performance supercapacitors from residual herbal materials through a simple activation process.

March 2, 2026

Self-Doped Hierarchical Porous Carbon Derived From Mixed Chinese Herbal Medicine Residues for High Performance Supercapacitors.

Key Points

The aim is to create high-performance supercapacitors from residual herbal materials through a simple activation process.
Preparation of porous carbons from mixed Chinese herbal medicinal residues.
KOH activation process under a nitrogen atmosphere.
Characterization of specific surface area and pore structure.
Achieved a specific surface area of 3359 m²·g⁻¹.
Demonstrated specific capacitance of 344 F·g⁻¹ at 1 A·g⁻¹.
Exhibited excellent cycling stability with 96% capacitance retention after 10,000 cycles.

Abstract

Porous carbons (YZPCs) with self-doped heteroatoms (oxygen and nitrogen) were successfully prepared from mixed Chinese herbal medicinal residues via a simple KOH activation process under a nitrogen atmosphere. The resulting carbon exhibits a high specific surface area of 3359 m2·g-1 and a hierarchical pore structure, which together provide abundant active sites for charge storage and facilitate rapid ion transport. Moreover, the substantial pseudocapacitance derived from the self-doped heteroatoms (N: 1.89 at%; O: 16.11 at%) further enhances the overall specific capacitance. The corresponding electrode delivers a specific capacitance of 344 F·g-1 at 1 A·g-1, 270 F·g-1 at 10 A·g-1, along with excellent cycling stability (96% capacitance retention after 10,000 cycles at 10 A·g-1). Overall, this study demonstrates the potential of the proposed method as an effective and low-cost approach to fabricate high-performance supercapacitors.

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