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Issue 37, 2017
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Hierarchical design of Cu1−xNixS nanosheets for high-performance asymmetric solid-state supercapacitors

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Abstract

Novel supercapacitor electrodes comprising hierarchical architectures with high specific surface areas, unique porosities, excellent conductivities, and admirable mechanical stabilities are necessary for developing high-performance solid-state supercapacitors. Herein, a novel ultra-thin copper nickel sulfide (Cu1−xNixS) nanosheet array supercapacitor electrode was constructed on a 3D Ni backbone through a powerful anion exchange technique and it demonstrated a unique architecture with a substantial degree of porosity. Accordingly, Cu1−xNixS plays an imperative role in the electrochemical energy storage characteristics of the electrode by accomplishing an ultra-high areal capacitance of 5.88 F cm−2 and a specific capacitance of 2672 F g−1 at a current density of 2 mA cm−2 with an excellent rate capability (71.26% capacitance retention at 20 mA cm−2) and a superior cycling performance (97.33% capacitance retention after 10 000 cycles). To design asymmetric supercapacitors (ASCs), Cu1−xNixS and N, S co-doped graphene nanosheets (NSGNSs) are employed as positive and negative electrodes, respectively. Remarkably, the fabricated ASC exhibits a potential window of ∼1.8 V, which demonstrates an ultra-high energy density of ∼94.05 W h kg−1 at 1.09 kW kg−1 as well as an excellent life cycle (95.86% capacitance retention after 10 000 cycles). Owing to this fact, this investigation offers a simple, scalable, and cost-effective approach for the fabrication of other ternary transition metal sulfides (TMSs), emphasizing great prospects in next-generation energy storage applications.

Graphical abstract: Hierarchical design of Cu1−xNixS nanosheets for high-performance asymmetric solid-state supercapacitors

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Publication details

The article was received on 11 May 2017, accepted on 21 Aug 2017 and first published on 21 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA04071G
Citation: J. Mater. Chem. A, 2017,5, 19760-19772
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    Hierarchical design of Cu1−xNixS nanosheets for high-performance asymmetric solid-state supercapacitors

    J. Balamurugan, C. Li, T. D. Thanh, O. Park, N. H. Kim and J. H. Lee, J. Mater. Chem. A, 2017, 5, 19760
    DOI: 10.1039/C7TA04071G

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