期刊
CHEMICAL ENGINEERING JOURNAL
卷 326, 期 -, 页码 401-410出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.05.167
关键词
Nickel cobaltite; Graphene; Doped carbon; Asymmetric supercapacitor; Energy storage
资金
- National Natural Science Foundation of China [21471139, 51402272]
- Shandong Province Outstanding Youth Scientist Foundation Plan [BS2014CL024]
- Qingdao Postdoctoral Science Foundation, Seed Fund from Ocean University of China [841412005]
- Fundamental Research Funds for the Central Universities [8411562011]
Mesoporous rod-like nickel cobaltite decorated on graphene has been fabricated by a facile hydrothermal method. Due to multiple redox reactions on nickel cobaltite, a high capacitance of 845 F g (1) can be obtained. In order to get high energy and power densities, an asymmetric supercapacitor has been assembled by using mesoporous nickel cobaltite-graphene nanocomposite as the positive electrode and doped carbon as the negative electrode. Benefitting from the balanced capacity on positive and negative electrode, the fabricated asymmetric supercapacitor exhibit a remarkable energy density of 52.2 Wh kg (1) and excellent cycling life with 97.3% capacitance retention ratio after 10,000 cycles. The outstanding electrochemical performance can be attributed to the synergetic contribution of these two electrodes, which gives a promising way for designing high performance energy storage device. (C) 2017 Elsevier B.V. All rights reserved.
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