期刊
INORGANIC CHEMISTRY FRONTIERS
卷 7, 期 2, 页码 427-436出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9qi01180c
关键词
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资金
- National Natural Science Foundation of China [21471086, 21971131]
- K. C. Wong Magna Fund in Ningbo University
Well-controlled core-shell nanostructured arrays are highly attractive and rational combination of hybrid electrochemical active materials as promising candidate electrodes for supercapacitors still remains a great challenge. In this work, ultrathin Ni(OH)(2) nanosheets as the shell were anchored on Cu7S4 nanorods as the core to form core-shell hybrid nanoarrays on copper foam (CF), which were firstly fabricated by a facile metal-organic framework templated synthetic strategy with a three-step procedure of in situ interface growth, sulfurization and hydrothermal synthesis. The core-shell Cu7S4@Ni(OH)(2)/CF hybrid nanoarrays as binder-free electrodes show a high specific capacitance of 1072.5 F g(-1) (482.6 C g(-1)) at a current density of 1 A g(-1), superior rate capacity of 86.4% at 10 A g(-1) and an outstanding cycling stability of 94.5% capacitance retention after 10 000 cycles. What's more, the assembled asymmetric supercapacitor device based on Cu7S4@Ni(OH)(2)/CF as a positive electrode and activated carbon (AC) as a negative electrode shows a high energy density of 52.5 W h kg(-1) at a power density of 750 W kg(-1) with decent cycling stability. This strategy can be extended to form other unique copper sulfide-based core-shell nanoarray architectures with enhanced electrochemical activity for high-performance energy storage devices.
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