Journal
SYNTHETIC METALS
Volume 233, Issue -, Pages 101-110Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2017.09.011
Keywords
Co3O4/C@MoS2; Core-shell structure; Metal-organic frameworks; Electrochemical energy storage; Supercapacitor
Funding
- Natural Science Foundation of Jiangsu Province [BK20171194, BK20140255]
- Future Research Project of Jiangsu Province [BE2017088]
- Changzhou high-tech Key Laboratory [CM20153001]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Hierarchical mesoporous Co3O4/C@MoS2 core-shell structured materials are synthesized via a two-step calcination and a solvothermal method using cobalt metal-organic frameworks (cobalt-MOFs, ZIF-67) and (NH4)(2)MoS4 as the precursors of Co3O4/C and MoS2, respectively, which is a new class of core-shell materials as supercapacitor electrode materials. The obtained Co3O4/C@MoS2 exhibits high specific capacitance (1076 F g(-1) at 1 A g(-1)), rate capability (76.9% capacitance retention at 10 A g(-1)) and cyclic stability (64.5% capacitance retention after 5000 cycles at 10 A g(-1)). Moreover, the content of MoS2 greatly influences the electrochemical performances of the obtained core-shell materials. The results demonstrate that the as-synthesized ZIF-67 can be used as a promising candidate for designing Co3O4 based core-shell materials used in supercapacitors.
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