Asymmetric Supercapacitor Based on Porous N-doped Carbon Derived from Pomelo Peel and NiO Arrays

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• 作者：Gan Qu ; Shuangfeng Jia ; Hai Wang ; Fan Cao ; Lei Li ; Chen Qing ; Daming Sun ; Bixiao Wang ; Yiwen Tang ; Jianbo Wang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：August 17, 2016
• 年：2016
• 卷：8
• 期：32
• 页码：20822-20830
• 全文大小：724K
• 年卷期：0
• ISSN：1944-8252

文摘

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.