Molten Salt Pyrolysis of Melamine-Modified Denim Fabric Waste into Nitrogen-Doped Activated Carbon for Supercapacitor Applications

摘要

abstract_textpConversion of biomass waste into nitrogen-doped porous carbon has been considered as a promising approach to achieve energy storage materials. Nitrogen-doped activated carbon materials have been successfully prepared by molten salt pyrolysis (MSP) using melamine modified-denim fabric waste as precursor. The molten salt medium provides liquid condition to carbonize and activate the denim fabric waste. Melamine produces a large amount of nitrogen element for doping the carbon materials. The obtained nitrogen-doped denim fabric-based carbon materials (NDFC-MSP) are composed of small fibrous fragment and thin sheet, and exhibit a high specific surface area (1975.2 m(2).g(-1)) and high pore volume (1.087 cm(3).g(-1)). Moreover, NDFC-MSP sample with a high nitrogen content of 6.93 wt. possesses a maximum specific capacitance of 345.8 F.g(-1) at 0.25 A.g(-1) in 6 M KOH electrolyte. It also displays a high specific capacitance of 230 F.g(-1) at 10 A.g(-1). The cycle stability shows 95.5 retention after 5000 charge-discharge cycles at 1 A.g(-1). In addition, the fabricated symmetric NDFC-MSP supercapacitor with a wide voltage range of 1.8 V generates a maximum energy density of 17.0 Wh.kg(-1) at power density of 225 W kg(-1) in 1 M Na2SO4 aqueous electrolyte./p/abstract_text