Co9S8 nanoparticle-decorated carbon nanofibers as high-performance supercapacitor electrodes |
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| Authors: | Ning Zhang Wencong Wang Changqing Teng Zongxiao Wu Ziran Ye Mingjia Zhi Zhanglian Hong |
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| Affiliation: | State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027 China ; Department of Applied Physics, Zhejiang University of Technology, Zhaohui Campus, Hangzhou 310014 China |
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| Abstract: | This work reported Co9S8 nanoparticle-decorated carbon nanofibers (CNF) as a supercapacitor electrode. By using a mild ion-exchange method, the cobalt oxide-based precursor nanoparticles were transformed to Co9S8 nanoparticles in a microwave hydrothermal process, and these nanoparticles were decorated onto a carbon nanofiber backbone. The composition of the nanofibers can be readily tuned by varying the Co acetate content in the precursor. The porous carbon nanofibers offered a fast electron transfer pathway while the well dispersed Co9S8 nanoparticles acted as the redox center for energy storage. As a result, high specific capacitance of 718 F g−1 at 1 A g−1 can be achieved with optimized Co9S8 loading. The assembled asymmetric supercapacitor with Co9S8/CNF as the cathode showed a high energy density of 23.8 W h kg−1 at a power density of 0.75 kW kg−1 and good cycling stability (16.9% loss over 10 000 cycles).Through electrospinning and the ion-exchange method, Co9S8 nanoparticle-decorated carbon nanofibers (Co9S8/CNF) have been fabricated, and exhibit good supercapacitor performance. |
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