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Hierarchical 3D Zn-Ni-P Nanosheet Arrays as an Advanced Electrode for High-Performance All-Solid-State Asymmetric Supercapacitors

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 mAh 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 10000 cycles). Furthermore, the Zn-Ni-P NS//Fe2O3@NG all-solid-state asymmetric SC (ASC) delivers an ultra-high volumetric capacity of 1.99 mAh cm3, excellent energy density of 90.12 Wh kg1 at a power density of 611 W kg1, and extraordinary cycling stability (93.05 % of initial capacity after 20000 cycles at 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.

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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, Accepted Manuscript
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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, Accepted Manuscript , DOI: 10.1039/C8TA01184B

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