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Issue 13, 2017
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3D yolk–shell NiGa2S4 microspheres confined with nanosheets for high performance supercapacitors

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Abstract

Recent advances in the development of two-dimensional transition-metal chalcogenides (2D TMCs) have opened up new avenues for supercapacitor applications. However, they still suffer from limited specific capacitance and poor rate capability due to their poor interfacial properties and simple geometry. Here, we propose a facile strategy for the synthesis of yolk–shell NiGa2S4 microspheres comprising crumpled nanosheets supported on nickel foam. The robust structure not only highly facilitates the electron and charge transportation but also efficiently alleviates the volume expansion during redox reactions, contributing to excellent electrochemical behaviors in terms of specific capacitance and rate capability. Significantly, an asymmetric supercapacitor based on the prepared NiGa2S4 as the positive electrode and N,S-codoped graphene/Fe2O3 (N,S-G/Fe2O3) as the negative electrode delivers a high energy density of 43.6 W h kg−1 at a power density of 961 W kg−1 and retains an energy density of 22.2 W h kg−1 even at 15 974 W kg−1. These impressive results may provide a new perspective to develop high energy and power density storage systems for practical applications.

Graphical abstract: 3D yolk–shell NiGa2S4 microspheres confined with nanosheets for high performance supercapacitors

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Publication details

The article was received on 14 Jan 2017, accepted on 16 Feb 2017 and first published on 17 Feb 2017


Article type: Paper
DOI: 10.1039/C7TA00469A
Citation: J. Mater. Chem. A, 2017,5, 6292-6298
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    3D yolk–shell NiGa2S4 microspheres confined with nanosheets for high performance supercapacitors

    S. Liu, K. H. Kim, J. M. Yun, A. Kundu, K. V. Sankar, U. M. Patil, C. Ray and S. Chan Jun, J. Mater. Chem. A, 2017, 5, 6292
    DOI: 10.1039/C7TA00469A

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