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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.