Nitrogen–doped activated carbon from waste biochar for supercapacitor electrode

State Key Laboratory of Efficient Production of Forest Resources, Beijing Key Laboratory Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083, China; X. Y. Shen; S. X. Yu; State Key Laboratory of Efficient Production of Forest Resources, Beijing Key Laboratory Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083, China; J. H. Mu; State Key Laboratory of Efficient Production of Forest Resources, Beijing Key Laboratory Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083, China; J. Li; State Key Laboratory of Efficient Production of Forest Resources, Beijing Key Laboratory Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083, China; S. Chen; State Key Laboratory of Efficient Production of Forest Resources, Beijing Key Laboratory Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083, China; F. Xu; State Key Laboratory of Efficient Production of Forest Resources, Beijing Key Laboratory Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083, China

doi:10.15251/djnb.2025.204.1570

journal article·2025-12-15Open access

Nitrogen–doped activated carbon from waste biochar for supercapacitor electrode

State Key Laboratory of Efficient Production of Forest Resources, Beijing Key Laboratory Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083, China, X. Y. Shen, S. X. Yu, State Key Laboratory of Efficient Production of Forest Resources, Beijing Key Laboratory Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083, China, J. H. Mu, State Key Laboratory of Efficient Production of Forest Resources, Beijing Key Laboratory Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083, China, J. Li, State Key Laboratory of Efficient Production of Forest Resources, Beijing Key Laboratory Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083, China, S. Chen, State Key Laboratory of Efficient Production of Forest Resources, Beijing Key Laboratory Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083, China, F. Xu, State Key Laboratory of Efficient Production of Forest Resources, Beijing Key Laboratory Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083, China

Digest Journal of Nanomaterials and Biostructures· Volume 20· Issue 4

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Source abstract

Abstract

In recent years, biochar has been increasingly used in energy storage devices. Furfural production and formic acid pulping industries offer a large amount of waste biochar, while such carbon-rich feedstocks still remain challenging in value-added utilization. In this study, waste biochar is processed into carbon-based electrodes through activation and nitrogen doping. The as-prepared electrode exhibits a highly porous microtopography and a significantly elevated specific surface area of ~553 m2 ·g-1 , which provides extensive adsorption sites for charges and promotesthe transport of electrolyte ions, thereby delivering a desirable specific capacitance of 464.6 F·g-1 . The symmetric supercapacitor assembled from such an electrode performs well in long-term cycling experiments, showcasing the coulombic efficiency of 96.3% after conducting 5000 charge/discharge cycles at a given current density (1 A·g-1 ). The utilization of modified waste biochar in electrode materials fabrication not only advances the evolution of sustainable, cost-effective, and highperformance biochar-based energy storage systems but also promotes the value-added utilization of waste biochar.

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Research context

Energy storage

OpenAlex topics: Supercapacitor Materials and Fabrication · Microbial Fuel Cells and Bioremediation · Adsorption and biosorption for pollutant removal

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

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