Work

Fabrication of porous nitrogen-doped biochar from chitosan gel for high-performance supercapacitor via magnesium hydroxide templating and activating

Year: 2025

Type: article

Abstract: To achieve the sustainable development and carbon neutral aim, renewable biomass chitosan was exploited to prepare active electrode materials for supercapacitor. Controllably structured Mg(OH) 2 was fabricated in situ during the chitosan gel formation, which functions as template and activator at the same time. The synthetic route was simplified only via one-step calcination at relatively low temperature. The accessed nitrogen-doped chitosan-derived biochar (NCB) features with hierarchical porous structure and large specific surface area. While applied as electrode material, the representative NCB exhibits the specific capacitance of 300 F g −1 at 1 A g −1 current density, which is 3.6 times of biochar prepared without Mg(OH) 2 templating. The cycling tests show that the specific capacitance is retained 93 % after running for 10,000 cycles, indicative of good long-term stability of NCB. Low cost, good stability, and high electrochemical performance make NCB a good candidate for the electrode material in supercapacitor.

Source: Diamond and Related Materials

DOI: 10.1016/j.diamond.2025.113084