دانلود رایگان مقاله غشای نازک مزوپور کربن دوپ نیتروژن برای ابرخازن binder-free

Abstract

Free-standing nitrogen-doped mesoporous carbon films were successfully prepared by carbonizing gelatin/HKUST-1 composite films, which converted from gelatin/copper hydroxide nanostrands composite films. Gelatin provides the sources of both carbon and nitrogen. The formation of HKUST-1 crystals expanded the gelatin matrix and produced porous structures which were reserved during the carbonization process. The mesoporous structures of the prepared carbon film were easily wetted by electrolytes and more suitable for rapid ionic migration. This mesoporous nitrogen-doped carbon film was explored as a binder-free electrode for supercapacitor, which exhibited highest specific energy of 28.1 W h kg−1, specific capacity of 316 F g−1 at a current density of 0.5 A g−1, 168 F g−1 at a current density of 5 A g−1, and high capacitance retention of 92.9% with degrading of 0.00064% after charging/discharging 11,000 cycles.

4. Conclusion

In summary, free-standing mesoporous nitrogen-doped carbon films (mp-NCF) were prepared by carbonization of porous gelatin/HKUST-1 composite films and removing away copper compounds. The mp-NCF thin film was directly used as electrode for capacitors without binder or conductive additive. In 1 M Na2SO4 electrolyte solution, the mp-NCF-900 electrode exhibited high capacitance of 168 F g−1 at 5Ag−1, and long cycling stability. The capacitance still remains at 156.2 F g−1 after 11,000 cycles with degrading rate of 0.00064% per cycle. Although this value is close to the capacitance reported so far for many carbon-based materials, the carbon electrode in our work is free-standing nitrogen-doped carbon film, which is an alternative candidate for film-like capacitors.