Highly Flexible Freestanding Porous Carbon Nanofibers for Electrodes Materials of High-Performance All-Carbon Supercapacitors

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• 作者：Ying Liu ; Jinyuan Zhou ; Lulu Chen ; Peng Zhang ; Wenbin Fu ; Hao Zhao ; Yufang Ma ; Xiaojun Pan ; Zhenxing Zhang ; Weihua Han ; Erqing Xie
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：October 28, 2015
• 年：2015
• 卷：7
• 期：42
• 页码：23515-23520
• 全文大小：407K
• ISSN：1944-8252

文摘

Highly flexible porous carbon nanofibers (P-CNFs) were fabricated by electrospining technique combining with metal ion-assistant acid corrosion process. The resultant fibers display high conductivity and outstanding mechanical flexibility, whereas little change in their resistance can be observed under repeatedly bending, even to 180掳. Further results indicate that the improved flexibility of P-CNFs can be due to the high graphitization degree caused by Co ions. In view of electrode materials for high-performance supercapacitors, this type of porous nanostructure and high graphitization degree could synergistically facilitate the electrolyte ion diffusion and electron transportation. In the three electrodes testing system, the resultant P-CNFs electrodes can exhibit a specific capacitance of 104.5 F g^鈥? (0.2 A g^鈥?), high rate capability (remain 56.5% at 10 A g^鈥?), and capacitance retention of 鈭?4% after 2000 cycles. Furthermore, the assembled symmetric supercapacitors showed a high flexibility and can deliver an energy density of 3.22 Wh kg^鈥? at power density of 600 W kg^鈥?. This work might open a way to improve the mechanical properties of carbon fibers and suggests that this type of freestanding P-CNFs be used as effective electrode materials for flexible all-carbon supercapacitors.