Citric/Acetic Acid-Assisted Hydrothermal Synthesis of Chitosan-Derived Porous Carbon for Supercapacitors

作者：Jiaqi Peng, Shanshan Li, Fubin Chen, Juan Ling, Mingtao Zheng, Chaofan Hu, Jianle Zhuang, Huashou Li, Hanwu Dong · 发表于：Energy & Fuels · 年份：2025 · DOI：10.1021/acs.energyfuels.5c01670 · 被引用次数：5 · 研究领域：Supercapacitor Materials and Fabrication、Nanomaterials for catalytic reactions、Catalysis for Biomass Conversion

Utilization of abundant renewable resources for preparing green materials for energy storage, such as supercapacitors, is important and challenging. The organic-acid-assisted hydrothermal process has recently emerged to be an effective way to regulate the porous structure of the final activated carbon. In this work, citric/acetic acids are employed as hydrothermal assisting reagents for the carbonization of chitosan prior to KOH activation of the hydrochar, for conducting a comparative study to better understand the effects of these organic acids. The study systematically investigated the impact of the acetic acid/citric acid addition ratio on the products of hydrochar and KOH-activated porous carbon. The results demonstrated that the addition of acetic acid (AC) was more conducive to the development of mesopores, while the addition of citric acid (CA) was more favorable for the development of micropores. The hierarchical distribution of the pore structure resulted from AC hydrothermal exhibiting the optimal electrochemical and cycle life performance at the same concentration. The highest specific surface area (3336 m 2 /g) was achieved when 0.8 mol/L AC (08ACK3) was added, which was significantly higher compared to those of nonassisted conventional as well as CA hydrothermal. In the three-electrode system, the specific capacitance of 08ACK3 reached 431.5 F/g at 0.5 A/g, which was higher than those of most of the previously reported chitosan-based porous carbon materials. Fur...