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Issue 18, 2018
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Hierarchical 3D Zn–Ni–P nanosheet arrays as an advanced electrode for high-performance all-solid-state asymmetric supercapacitors

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Abstract

High-performance all-solid-state supercapacitors (SCs) have potential applications in modern electronics, such as portable and flexible electronics; however, their low specific capacity and operating voltage window limit their industrial applications. Herein, we developed a new type of zinc nickel phosphide nanosheet (Zn–Ni–P NS) arrays via a simple, scalable, and cost-effective hydrothermal and subsequent effective phosphorization technique to enhance the electrochemical performance of SCs. The hierarchical Zn–Ni–P NS array electrode exhibits an ultra-high specific capacity of ∼384 mA h g−1 at a current density of 2 mA cm−2 with excellent rate capability (79.43% of capacity retention at 50 mA cm−2), and outstanding cycling stability (∼96.45% of capacity retention after 10 000 cycles). Furthermore, the Zn–Ni–P NS//Fe2O3@NG all-solid-state asymmetric SC (ASC) delivers an ultra-high volumetric capacity of ∼1.99 mA h cm−3, excellent energy density of ∼90.12 W h kg−1 at a power density of 611 W kg−1, and extraordinary cycling stability (93.05% of initial capacity after 20 000 cycles at a high current density of 15 mA cm−2). Such enhanced electrochemical performances are ascribed to the 3D hierarchical nanostructures, porous nanonetworks, improved conductivity, and synergistic interaction between the active components of Zn–Ni–P NS arrays.

Graphical abstract: Hierarchical 3D Zn–Ni–P nanosheet arrays as an advanced electrode for high-performance all-solid-state asymmetric supercapacitors

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Publication details

The article was received on 05 Feb 2018, accepted on 09 Apr 2018 and first published on 09 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA01184B
Citation: J. Mater. Chem. A, 2018,6, 8669-8681
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    Hierarchical 3D Zn–Ni–P nanosheet arrays as an advanced electrode for high-performance all-solid-state asymmetric supercapacitors

    T. T. Nguyen, J. Balamurugan, N. H. Kim and J. H. Lee, J. Mater. Chem. A, 2018, 6, 8669
    DOI: 10.1039/C8TA01184B

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