文献类型：期刊文献

英文题名：Ultrafast Joule Heating Modification of Methane-Pyrolyzed Carbon Black for Supercapacitor Application

作者：He, Guinan[1,2];Shen, Zhongjie[1,2];Liu, Haifeng[1,2,3]

机构：[1]East China Univ Sci & Technol, Natl Energy Coal Gasificat Technol Res & Dev Ctr, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, Shanghai 200237, Peoples R China;[3]Liaoning Petrochem Univ, Fushun 113001, Liaoning, Peoples R China

年份：2024

卷号：40

期号：50

起止页码：26685

外文期刊名：LANGMUIR

收录：;EI(收录号：20245017515750);WOS:【SCI-EXPANDED(收录号:WOS:001372186900001)】；

基金：This study was supported by the National Natural Science Foundation of China (22378130) and the Fundamental Research Funds of the Central Universities (2022ZFJH004).

语种：英文

外文关键词：Conductive materials - Graphitization - Joule heating - Pyrolysis - Supercapacitor

摘要：Carbon black from methane pyrolysis for hydrogen is an alternative resource and can be improved for conductive material supplication. Our current work uses an ultrafast Joule heating technique to modify the methane-pyrolyzed carbon black and prepare nanoparticles of electrode material for supercapacitor application, coupled with density functional theory, structural, and electrochemical analyses. Evolution rules of the carbon and pore structures of the modified sample with an increase in temperature reveal good structure improvements. The graphitization degree of modified carbon black nanoparticles increases, and the particle morphology changes from a smooth surface, disordered structure removal, and pore formation to graphite crystallization. Band structure and state density analytical results show that the modified carbon black with a defect-free structure possesses metallic properties and exhibits good electrical conductivity. A temperature around 1576 degrees C to the initial graphitization was defined based on the critical point of the evolution of ordered and disordered structures, while the electrical conductivity of the carbon black nanoparticles at 2000 degrees C reaches 2300 S/m. The modified carbon black performed with stable charge/discharge characteristics, exhibiting a 4.31% capacitance drop at a current load of 2 A/g and a 18.31% capacitance drop at a current load of 20 A/g.