Tailoring Kirkendall Effect of the KCu7S4 Microwires towards CuO@MnO2 Core-Shell Nanostructures for Supercapacitors

[Display omitted] We construct uniform hierarchical CuO@MnO2 core-shell structure via Kirkendall effect of KCu7S4microwires without any surfactants. KCu7S4 microwires are synthesized by a hydrothermal method. Subsequently, MnO2 nanosheets are grown on the CuO microtubes to form core–shell structures...

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Bibliographic Details
Published in:Electrochimica acta 2015-08, Vol.174, p.87-92
Main Authors: Guo, Xiao Long, Li, Gang, Kuang, Min, Yu, Liang, Zhang, Yu Xin
Format: Article
Language:English
Subjects:
Copper oxide
Core-shell
Kirkendall effect
Manganese dioxide
Supercapacitors
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Summary:[Display omitted] We construct uniform hierarchical CuO@MnO2 core-shell structure via Kirkendall effect of KCu7S4microwires without any surfactants. KCu7S4 microwires are synthesized by a hydrothermal method. Subsequently, MnO2 nanosheets are grown on the CuO microtubes to form core–shell structures in the hydrothermal conditions. Based on time-dependent observation, a possible evolution mechanism for the hollow-core-shell structure is proposed. And the application of as-prepared CuO@MnO2 as the electrode for supercapacitor has been investigated, the core-shell structure enable the electrode with relatively high capacitance (252.6Fg−1 (capacity: 70.2mAhg−1) at the current density of 0.1Ag−1, based on the total mass of CuO and MnO2) and good stability (90.8% capacitance retention at 1Ag−1 after 1000 charge–discharge cycles).
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2015.05.157