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Growth of NiMn LDH nanosheet arrays on KCu7S4 microwires for hybrid supercapacitors with enhanced electrochemical performance

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Abstract

The rational design and synthesis of hierarchical three-dimensional nanostructures with diversified compositions and fascinating morphologies can provide abundant choices and enhanced probability for applications in the energy storage field. Herein, we report an effective, metal catalyst- or surfactant-free approach for the controlled growth of hierarchical one-dimensional (1D)/two-dimensional (2D) nanostructures. The quasi-paralleled and interlaced nanosheet arrays of NiMn layered double hydroxides are grown on KCu7S4 microwires with a quasi-one-dimensional channel. The supersaturation of the system and screw dislocation-driven growth pattern of 2D materials could be key factors in determining the structure of the nanosheets arrays of NiMn LDHs. The electrochemical investigation shows that the KCu7S4@NiMn LDHs have a significantly enhanced specific capacitance (879 F g−1 at 1 mV s−1, 733.8 F g−1 at 1 A g−1) and rate capability (76.9% retention at 30 A g−1) that far exceed those of the reported individual KCu7S4 electrodes. A hybrid supercapacitor based on KCu7S4@NiMn LDH//activated graphene electrode also presents good cycle stability (an 84.8% capacitance retention after 16 000 cycles). The outstanding supercapacitor performance forebode the enormous potential of KCu7S4@NiMn LDH composites in electrochemical properties.

Graphical abstract: Growth of NiMn LDH nanosheet arrays on KCu7S4 microwires for hybrid supercapacitors with enhanced electrochemical performance

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Publication details

The article was received on 19 May 2017, accepted on 19 Jul 2017 and first published on 19 Jul 2017


Article type: Communication
DOI: 10.1039/C7TA04382A
Citation: J. Mater. Chem. A, 2017, Advance Article
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    Growth of NiMn LDH nanosheet arrays on KCu7S4 microwires for hybrid supercapacitors with enhanced electrochemical performance

    X. L. Guo, J. M. Zhang, W. N. Xu, C. G. Hu, L. Sun and Y. X. Zhang, J. Mater. Chem. A, 2017, Advance Article , DOI: 10.1039/C7TA04382A

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