Supercapacitor Materials and Fabrication
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Abstract
Abstract
Biochar with low cost, green, and renewable characteristics is an important research direction for porous carbon electrode materials at present. Herein, nitrogen-doped hierarchical porous carbon was prepared from Weigela japonica waste biomass through the hydrothermal-KOH activation-N doping collaborative strategy. By tuning the melamine dosage, the pore structure and electrochemical performance were systematically regulated. The optimized NWJPC-2 exhibited a specific surface of 2,916 m 2 g −1 and delivered 318.8 F g −1 at 1 A g −1 . A symmetric supercapacitor retained 99.8% of its capacitance after 10,000 cycles. When assembled into a zinc-ion hybrid capacitor, NWJPC-2 achieved 109.5 mAh g −1 at 0.5 A g −1 and an energy density of 44.7 Wh kg −1 at 225.0 W kg −1 , with 99.9% capacity retention after 10,000 cycles. This research confirms that waste offering a straightforward and efficient approach to developing sustainable electrode materials for energy storage and enabling the high-value conversion of waste biomass resources.
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@article{Wang2026Research,
title = {Research on N-doped modified Weigela japonica-based porous carbon and its zinc ion hybrid capacitors energy storage},
author = {Mei Wang and Tingzhou Lei and Yuanna Li and Suyang Liu and Jiajing Tang and Yifan Liu and Yantao Yang},
journal = {iScience},
year = {2026},
doi = {10.1016/j.isci.2026.117248},
url = {https://doi.org/10.1016/j.isci.2026.117248}
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