Optimized preparation and capacitive performance evaluation of coal asphaltene: PAN-based nitrogen doped porous carbon membranes

In this paper, coal asphaltene/polyacrylonitrile based nitrogen doped porous carbon membrane (NPCM) was prepared by electrospinning using SBA-15 as hard template agent. The effects of raw material composition and carbonization temperature on the carbonization yield, specific surface area and capacitive properties of the porous carbon membrane were studied. When the mass ratio of SBA-15:asphaltene:polyacrylonitrile=1:1.2:4.8, the carbonization yield (58.7%) and specific surface area (427.6m²/g) of NPCM2 were higher. The specific capacitance of NPCM2 reaches 214.2F/g. After 10000 times of charge and discharge at 1A/g, the capacitance retention rate of NPCM2 can reach 94.1%. Coal asphaltene/polyacrylonitrile based nitrogen doped porous carbon membrane is expected to become a high-performance flexible electrode material.