Electrospun Carbon Nanofibers with in Situ Encapsulated Co3O4 Nanoparticles as Electrodes for High-Performance Supercapacitors

被引:202
作者
Abouali, Sara [1 ]
Garakani, Mohammad Akbari [1 ]
Zhang, Biao [1 ]
Xu, Zheng-Long [1 ]
Heidari, Elham Kamali [1 ]
Huang, Jian-qiu [1 ]
Huang, Jiaqiang [1 ]
Kim, Jang-Kyo [1 ]
机构
[1] Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Kowloon, Hong Kong, Peoples R China
关键词
cobalt oxide; electrospinning; carbon nanofiber; graphitization; pseudocapacitance; supercapacitor; ENHANCED ELECTROCHEMICAL PERFORMANCE; CATALYTIC GRAPHITIZATION; NANOSTRUCTURED CO3O4; SURFACE-STRUCTURE; COBALT HYDROXIDE; COMPOSITE; GRAPHENE; ANODES; NANOCOMPOSITES; ARCHITECTURES;
D O I
10.1021/acsami.5b02787
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
A facile electrospinning method with subsequent heat treatments is employed to prepare carbon nanofibers (CNEs) containing uniformly dispersed Co3O4 nanoparticles as electrodes for supercapacitors. The Co3O4/CNF electrodes with similar to 68 wt % active particles deliver a remarkable capacitance of 586 F g(-1) a current density of 1 A g(-1). When the current density is increased to 50 A g(-1), similar to 66% of the original capacitance is retained. The electrodes also present excellent cyclic stability of 74% capacity retention after 2000 cycles at 2 A These superior electrochemical properties are attributed to the uniform dispersion of active particles in the CNF matrix, which functions as a conductive support. The onionlike graphitic layers formed around the Co3O4 nanoparticles not only improve the electrical conductivity of the electrode but also prevent the separation of the nanoparticles from the carbon matrix.
引用
收藏
页码:13503 / 13511
页数:9
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