Study on the synthesis of porous carbon materials from carbonization of waste file bags and their supercapacitor performance
摘要
The file folder is a crucial tool for safeguarding the physical integrity of archives. With the acceleration of the informatization process, traditional paper-based archives have been replaced by electronic ones, resulting in a large amount of archive bag waste and causing environmental pollution. This work takes this waste as the precursor, undergoes carbonization combined with KOH activation to prepare high-performance porous carbon materials, and systematically explores the influence of carbonization temperature on the morphology, pore structure and electrochemical performance of the materials. The results show that the FF-700 porous carbon prepared at a carbonization temperature of 700 °C has the best performance: electrochemical tests indicate that its specific capacitance reaches 340 F g− 1 at a current density of 1 A g− 1, and still maintains 258 F g− 1 at 10 A g− 1; after 10,000 cycles, the specific capacitance retention rate reaches 94.8%, demonstrating excellent cycle stability. In addition, when FF-700 is used as the electrode and assembled with MnO2 to form an asymmetric supercapacitor, the energy density of the device reaches 32.7 Wh kg− 1 at a current density of 1 A g− 1 (corresponding to a power density of 800 W kg− 1). In summary, this work provides a verifiable design concept and effective path for preparing high-performance supercapacitor electrode materials from paper-based waste, achieving the resource utilization and value enhancement of waste.