Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 8, Pages 9365-9375Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b22606
Keywords
supercapacitor; MOF; CoSe2; N-doped carbon; nanosheets
Funding
- National Natural Science Foundation of China [51572052]
- National Students' platform for innovation and entrepreneurship training program [201910217094]
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Metal-organic framework (MOF)-derived composites of transition metal oxides and porous carbon show great potential for energy storage applications. Selenylation is an effective strategy to improve the electrochemical properties of electrode materials. A facile one-step derivation and selenylation of MOFs is proposed here to obtain CoSe2 nanoparticles embedded into an N-doped carbon skeleton material (CoSe2/NC). Moreover, the composite is directly grown on nickel foam as nanosheet arrays, rather than on other materials as powders. The CoSe2/NC electrode with special construction exhibits a high capacity of 120.2 mA h g(-1) at 1 A g(-1) and an excellent cyclic ability of 8% loss after 10,000 cycles. An asymmetric supercapacitor CoSe2/NC-NF//AC displays a maximum energy density of 40.9 W h kg(-1) at 980 W kg(-1). Moreover, the device has demonstrated that it can successfully charge a mobile phone. The outstanding performance indicates promising potential of CoSe2/NC-NF electrodes for supercapacitors.
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