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Asymmetric Supercapacitor Based on Porous N-doped Carbon Derived from Pomelo Peel and NiO Arrays
- Qu, Gan, Jia, Shuangfeng, Wang, Hai, Cao, Fan, Li, Lei, Qing, Chen, Sun, Daming, Wang, Bixiao, Tang, Yiwen, Wang, Jianbo
- ACS Applied Materials & Interfaces 2016 v.8 no.32 pp. 20822-20830
- ammonia, capacitance, carbon, citrus peels, energy density, nickel oxide, surface area
- A three dimensional (3D) porous framework-like N-doped carbon (PFNC) with a high specific surface area was successfully fabricated through ammonia doping and graphitization based on pomelo peel. The obtained PFNC exhibits an enhanced specific capacitance (260 F g–¹ at 1 A g–¹) and superior cycling performance (capacitance retention of 84.2% after 10000 cycles at 10 A g–¹) on account of numerous voids and pores which supply sufficient pathways for ion diffusion during cycling. Furthermore, a fabricated asymmetric PFNC//PFN device based on PFNC and porous flake-like NiO (PFN) arrays achieves a specific capacitance of 88.8 F g–¹ at 0.4 A g–¹ and an energy density of 27.75 Wh kg–¹ at a power density of 300 W kg–¹ and still retains 44 F g–¹ at 10 A g–¹ and 13.75 Wh kg–¹ at power density of 7500 W kg–¹. It is important that the device is able to supply two light-emitting diodes for 25 min, which demonstrates great application potential.