煤质技术2025，Vol.40Issue(5)：15-22,8.DOI:10.3969/j.issn.1007-7677.2025.05.003
高温热处理对无灰煤基活性炭电化学性能的影响
Effects of high temperature treatment on the electrochemical performance of hypercoal-based activated carbon
摘要
Abstract
Research on the influence of high-temperature treatment on the electrochemical performance of activated carbon electrodes can improve the preparation process of electrode materials to enhance their energy density,provi-ding technical support for promoting their large-scale application.Hypercoal derived from lignite served as the raw material.KOH activation was used to prepare hypercoal-based activated carbon.HNO3 and ammonia were utilized as nitrogen sources to modify the hypercoal-based activated carbon with a liquid-phase impregnation followed with high-temperature treatment process.The modified materials were fabricated into supercapacitor electrodes.Activated car-bons were characterized by low temperature nitrogen adsorption and Fourier Transform Infrared Spectroscopy(FTIR).The electrochemical performance of activated carbon electrode was tested by constant current charge-discharge,cyclic voltammetry(CV)and electrochemical impedance spectroscopy(EIS).Compared with the influence on the surface structure properties and electrochemical performance with high-temperature treatment.The results show that the graphitization degree of activated carbons increases and pore structure is concentrated with high temperature treatment;Surface functional groups change significantly after two kinds of agents modified and transfer into the graphite layers.The oxygen-containing functional groups such as-COO—,C=O and C-OH were increased after high-tempera-ture treatment of HNO3,while the N-Q was mainly increased after high-temperature treatment of ammonia,while C=O and C-OH were decreased.The addition of nitrogen-containing groups can inhibit the incorporation of oxy-gen-containing groups.C=O and C-OH would be had bad effects on the diffusion resistance of the electrode mate-rial.Specific capacitance of activated carbon is 270 F/g at a current density of 50 mA/g with HNO3,the energy den-sity is 24.38 Wh/kg,demonstrating good structural characteristics and electrochemical performance.关键词
高温热处理/无灰煤基活性炭/电化学性能/超级电容器/表面官能团/孔结构Key words
high temperature treatment/hypercoal-activated carbon/electrochemical properties/supercapacitor/surface functional groups/pore structure分类
化学化工引用本文复制引用
孔碧华..高温热处理对无灰煤基活性炭电化学性能的影响[J].煤质技术,2025,40(5):15-22,8.基金项目
国家重点研发计划资助项目(2023YFB4103800) （2023YFB4103800）
