Preparation of coal tar pitch-based porous carbon with high yield and excellent capacitive performance assisted by magnesium hydroxide-zinc borate composite flame retardant
Coal tar pitch-based porous carbon was prepared by carbonizing the carbon source of coal tar pitch and flame retardant of magnesium hydroxide-zinc borate composite salt directly in the air,and its electrochemical perfor-mance was explored.Thanks to the synergistic effect of flame retardants on flame retardancy,activation,and doping functionalization,coal tar pitch-based porous carbon with high yield(55.1％),multi-heteroatom doping,and hierar-chical structure was obtained.As the electrode material for supercapacitor,the specific capacitance can reach 344 F·g-1 at a current density of 0.5 A·g-1 in a three-electrode system.In addition,the flexible capacitor assembled with the prepared porous carbon and chitosan amino acid proton salt gel electrolyte has an energy density of 29.3 Wh· kg-1,the capacitance remained 96.9％after 50 000 cycles,and it can work normally in the temperature range from-25 to 75 ℃,which had a wide operating temperature range.
coal tar pitchflame retardantporous carbonsupercapacitor
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NSTL
万方数据
维普
