超临界相态下制备煤焦油基多孔碳及其电化学性能OA

This paper is aimed at investigating the effect of solvent heat temperature on the formation structure and electrochemical properties of porous carbon by taking high-temperature coal tar as the raw material,preparing carbonaceous mesophases with the solvent heat method,and preparing the porous car-bon materials with the potassium hydroxide activation method.The study involves determining the carbo-naceous mesophases,and the thermal stability,structure and the morphology of porous carbon by using SEM,TG,FT-IR,XRD,and nitrogen adsorption-desorption characterization techniques;analyzing the im-pact of solvent heat temperature on microstructural alterations during the formation of porous carbon;and researching the regulation law of the porous carbon structure on electrochemical characteristics.The re-sults show that the graphitized carbon-like materials with well-developed mesoporous structures and abun-dant oxygen-containing groups can be obtained at a solvent heat temperature of 240℃.Due to its unique structure,the porous carbon exhibits better electrochemical performance with a mass-specific capacitance of up to 275 F/g at a current density of 0.3 A/g,and at a current density of 5 A/g,the capacitance re-tention can reach 98%after 2 000 cycles.This study reveals a theoretical and practical basis for the syn-thesis of porous carbon based on coal tar with favorable electrochemical characteristics.