基于K2CO3一步活化作用的煤基多孔碳孔隙与微晶结构协同发展  

Synergistic Development Mechanism Between Pore Structure of Coal-Based Porous Carbon and Microcrystalline Structure Based on One-Step K2CO3 Activation Process

作　　者：王丽杰 高伟 曹善桥 李森 孙飞[2] 高继慧[2] Wang Lijie;Gao Wei;Cao Shanqiao;Li Sen;Sun Fei;Gao Jihui(China Datang Corporation Renewable Energy Science and Technology Research Institute Co.,Ltd,Beijing 100040,China;School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]中国大唐集团新能源科学技术研究院有限公司,北京100040 [2]哈尔滨工业大学能源科学与工程学院,哈尔滨150001

出　　处：《燃烧科学与技术》2020年第6期575-587,共13页Journal of Combustion Science and Technology

基　　金：华中科技大学煤燃烧国家重点实验室开放基金资助项目(FSKLCCA1907).

摘　　要：在碳基储能应用中,多孔碳丰富的孔隙结构与较好的石墨化度有助于提高电解液离子的表面吸附能力与电子传输能力.因此,孔隙结构与石墨化度协同调控是多孔碳材料结构调控的重要方面.但在多孔碳制备过程中,孔隙和微晶结构的演变相互依存,难以协同调控,是研究的难点.本文提出K2CO3一步高温化学活化工艺,基于K基组分在高温刻蚀反应中的造孔与催化石墨化作用,实现煤基多孔碳孔隙与石墨化度的协同调控,所得多孔碳在电解液离子吸附储能中展现优异的性能.研究结果表明:在K2CO3一步化学活化过程,多孔碳孔隙结构由极微孔向微孔和分级孔演变;碳微晶由无定形向石墨化结构演变,在较高反应温度下(1000℃及以上),实现了孔隙与微晶结构协同发展;具有石墨化结构的分级孔碳作为有机系对称电容器件电极材料具有较高的比电容、倍率性能和运行稳定性.In the carbon-based energy storage applications,the abundant pore structure and good graphitization of porous carbon are helpful to improve its adsorption capacity and electron transfer capacity on the surface of electrolyte ions.Therefore,the synergistic regulation of pore structure and graphitization degree of porous carbon is an important aspect of the synergistic regulation of porous carbon material.However,during the porous carbon preparation,the evolution of pore and microcrystalline structure is interdependent and difficult to coordinate.In this paper,a one-step K2CO3 high-temperature activation process was proposed based on the pore formation and catalytic graphitization of K-based components in a high-temperature etching reaction,which realized the synergistic regulation of coal-based porous carbon pore and graphitization degree.The obtained coal-based porous carbon exhibited excellent performance in electrolyte ion adsorption and storage.Research results show that the porous structure obtained by the one-step K2CO3 chemical activation evolved from ultramicropores to micropores and hierarchical pores.The carbon structure changed from amorphous to graphitized,and the synergistic development of porous structure and microcrystals was realized when temperature increased up to 1000℃.As electrode material for the symmetric capacitor device with organic electrolyte,the obtained hierarchical porous carbon with graphene-like structure had a higher specific capacitance,higher rate performance,and higher operation stability.

关 键 词：K2CO3一步活化 煤基多孔碳 孔隙结构 微晶结构 超级电容器 

分 类 号：TQ530[化学工程—煤化学工程]