炭化条件对煤液化沥青基泡沫炭制备及电化学性能的影响OA

The resource utilization of coal liquefaction pitch is still dominated by conven-tional methods.Developing low-cost and high-value-added utilization technologies has become a criti-cal subject for improving the economic and energy efficiency of coal liquefaction technology.In this study,Shenhua coal liquefaction pitch was used as a precursor to prepare hierarchical porous coal liq-uefaction pitch(CLP)-based carbon foam through a polyurethane templating method combined with steam activation,and its electrochemical performance as an electrode materials was systematically investigated.By controlling the carbonization temperature and time,the mechanisms affecting the pore structure,crystalline structure,and surface chemistry of the carbon foam were deeply eluci-dated.The results indicate that the carbon foam prepared under optimized conditions exhibits excel-lent physical characteristics:ACF-800-120 has the lowest bulk density(0.036 g/cm3)and the high-est porosity(93.95%),while ACF-800-30 possesses the largest specific surface area(430.70 m2/g)and pore volume(0.230 6 cm3/g).Further studies reveal that carbonization temperature and time sig-nificantly influence the materia's structure:a moderate increase in carbonization temperature enhances the crystallite ordering and graphitization degree,while excessive carbonization leads to the collapse of the pore structure collapse,and the increased structural disorder.XPS analysis indicats that heteroat-oms such as N and S are gradually eliminated during carbonization,while the oxygen content firstly increases and then decreases at higher temperature.Electrochemical tests show that the prepared carbon foam displays outstanding performance in 6 mol/L KOH electrolyte:ACF-800-120 demon-strates the highest specific capacitance of 122.82 F/g at 0.5 A/g,while ACF-800-60 exhibits the optimal rate capability with 77.60%capacity retention at a 20-fold current increase.All samples show an ultralow resistance of 0.26 Ω-0.32 Ω.This study provides a new approach for the high-value utilization of coal liquefaction pitch,and the prepared materials show broad application prospects in the field of supercapacitor electrodes.