期刊
RSC ADVANCES
卷 8, 期 48, 页码 27574-27579出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ra04296a
关键词
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资金
- National Key Research and Development Program [2016YFB0901600]
- NSFC [21303162, 11604295]
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).
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