Journal
APPLIED SURFACE SCIENCE
Volume 540, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.148295
Keywords
Metal-organic framework; Nickel oxide; Supercapacitor; Composite material; Self-standing electrode
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea(NRF) - Ministry of Education [NRF-2019R1F1A1062290]
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The proposed nickel oxide-carbon composite shows potential as a promising electrode material for supercapacitors, with high specific capacitances and rate capability observed in a self-standing electrode structure.
Compared to conventional electrode, a self-standing structure electrode is an effective way to achieve high performance of supercapacitor by maximizing the use of active material. We present a new combination of nickel oxide-carbon composites fabricated by directly carbonizing a nickel metal-organic framework (Ni-MOF)@carbon nanofiber (CNF) for a self-standing electrode of the supercapacitor application. The new scheme utilizes the CNF film as a substrate with high electron transferring capability and as a backbone of a self-standing electrode as well. It is observed that the MOF-derived NiOs with a diameter of similar to 8 nm are uniformly distributed in the carbon matrix and result in the improvement of the electrical conductivity. The self-standing electrode, NiO/C@CNF composite, provides a high rate capability with high specific capacitances of 742.2 and 671.1F g(-1) (at 1 and 10 A g(-1)), respectively. An asymmetric supercapacitor (ASC) constructed from the NiO/C@CNF and the activated carbon exhibits an excellent specific energy density of 58.43 Wh kg(-1) at a power density of 1,947 W kg(-1). It is also confirmed that the ASC shows a good cycle stability from the long-term cycling test. It is demonstrated that the proposed nickel oxide-carbon composite has a potential as promising self-standing electrode materials for supercapacitors.
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