煤炭转化2024，Vol.47Issue(3)：92-102,11.DOI:10.19726/j.cnki.ebcc.202403009
神东低阶煤基电容炭材料的制备及其电化学性能
Preparation of Shendong low-rank coal-based capacitive carbon materials and its electrochemical performance
摘要
Abstract
To investigate the impacts of specific surface area and micropore pore volume on the electrochemical performance of capacitive carbons derived from low-rank coal,a series of coal-based capacitive carbons were prepared via solid-phase activation by varying the mass ratio of potassium hydroxide(KOH)to Shendong ultra-low ash coal(SLC)(KOH-to-SLC ratio).The composition and pore structure of the capacitive carbon materials were characterized using induc-tive coupled plasma mass spectrometry,ultimate analysis,and nitrogen adsorption/desorption techniques,respectively.The electrochemical performance was assessed through constant cur-rent-discharge tests,cyclic voltammetry(CV),and electrochemical impedance spectroscopy.The results show that as the KOH-to-SLC ratio increases,both the specific surface area and total pore volume of the capacitive carbon materials are enhanced,reaching up to 2736.20 m2/g and 1.296 8 cm2/g,respectively.At a KOH-to-SLC ratio of 2.0∶1,the produced coal-based capaci-tive carbon exhibits a specific surface area of 2 517.80 m2/g and a micropore surface area of 2 485.59 m2/g,which accounted for 98.72%of the total surface area.The micropore pore vol-ume peaked at 0.064 8 cm2/g.Under these conditions,the coal-based capacitive carbon demon-strates a high mass specific capacitance of 173.8 F/g in an organic electrolyte at a current density of 0.05 A/g and maintained a mass specific capacitance of 159.4 F/g at 10 A/g,showing a reten-tion rate of 91.72%.Coal-based capacitive carbon materials has excellent charge-discharge re-versibility and typical double-layer capacitance behavior.关键词
低阶煤/化学活化/煤基电容炭/固相活化/微孔结构Key words
low rank coal/chemical activation/coal-based capacitive carbon/solid-phase activation/microporous structure分类
化学化工引用本文复制引用
王斌,李晓明,孙国华..神东低阶煤基电容炭材料的制备及其电化学性能[J].煤炭转化,2024,47(3):92-102,11.基金项目
国家重点研发计划项目(2022YFB4101602)、山西省重点研发计划项目(202202040201007)、山西省科技成果转化引导专项项目(202104021301068)和中国神华能源股份有限公司神东煤炭分公司科技创新项目(HT[2021]96号). （2022YFB4101602）
