High-Performance Supercapacitor Electrode Materials from Cellulose-Derived Carbon Nanofibers

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• 作者：Jie Cai ; Haitao Niu ; Zhenyu Li ; Yong Du ; Pavel Cizek ; Zongli Xie ; Hanguo Xiong ; Tong Lin
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：July 15, 2015
• 年：2015
• 卷：7
• 期：27
• 页码：14946-14953
• 全文大小：448K
• ISSN：1944-8252

文摘

Nitrogen-functionalized carbon nanofibers (N-CNFs) were prepared by carbonizing polypyrrole (PPy)-coated cellulose NFs, which were obtained by electrospinning, deacetylation of electrospun cellulose acetate NFs, and PPy polymerization. Supercapacitor electrodes prepared from N-CNFs and a mixture of N-CNFs and Ni(OH)₂ showed specific capacitances of 鈭?36 and 鈭?045 F g^鈥?, respectively. An asymmetric supercapacitor was further fabricated using N-CNFs/Ni(OH)₂ and N-CNFs as positive and negative electrodes. The supercapacitor device had a working voltage of 1.6 V in aqueous KOH solution (6.0 M) with an energy density as high as 鈭?1 (W h) kg^鈥? and a maximum power density of 鈭?17 kW kg^鈥?. The device had excellent cycle lifetime, which retained 鈭?4% specific capacitance after 5000 cycles of cyclic voltammetry scans. N-CNFs derived from electrospun cellulose may be useful as an electrode material for development of high-performance supercapacitors and other energy storage devices.