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    NiCo2O4@TiN Core-shell Electrodes through Conformal Atomic Layer Deposition for All-solid-state Supercapacitors

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    Type
    Article
    Authors
    Wang, Renqi
    Xia, Chuan cc
    Wei, Nini
    Alshareef, Husam N. cc
    KAUST Department
    Electron Microscopy
    Functional Nanomaterials and Devices Research Group
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    The KAUST School
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2016-03-12
    Online Publication Date
    2016-03-12
    Print Publication Date
    2016-04
    Permanent link to this record
    http://hdl.handle.net/10754/600666
    
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    Abstract
    Ternary transition metal oxides such as NiCo2O4 show great promise as supercapacitor electrode materials. However, the unsatisfactory rate performance of NiCo2O4 may prove to be a major hurdle to its commercial usage. Herein, we report the development of NiCo2O4@TiN core–shell nanostructures for all-solid-state supercapacitors with significantly enhanced rate capability. We demonstrate that a thin layer of TiN conformally grown by atomic layer deposition (ALD) on NiCo2O4 nanofiber arrays plays a key role in improving their electrical conductivity, mechanical stability, and rate performance. Fabricated using the hybrid NiCo2O4@TiN electrodes, the symmetric all-solid-state supercapacitor exhibited an impressive stack power density of 58.205 mW cm−3 at a stack energy density of 0.061 mWh cm−3. To the best of our knowledge, these values are the highest of any NiCo2O4-based all-solid-state supercapacitor reported. Additionally, the resulting NiCo2O4@TiN all-solid-state device displayed outstanding cycling stability by retaining 70% of its original capacitance after 20,000 cycles at a high current density of 10 mA cm−2. These results illustrate the promise of ALD-assisted hybrid NiCo2O4@TiN electrodes for sustainable and integrated energy storage applications.
    Citation
    NiCo2O4@TiN Core-shell Electrodes through Conformal Atomic Layer Deposition for All-solid-state Supercapacitors 2016 Electrochimica Acta
    Sponsors
    The research reported in this publication has been supported by King Abdullah University of Science and Technology (KAUST). Ruiqi Wang thanks the KAUST Visiting Student Research Program for the excellent opportunity. The authors thank the staff of the KAUST Nanofabrication, Thin Film, Imaging, and Characterization Core Laboratories for their wonderful support.
    Publisher
    Elsevier BV
    Journal
    Electrochimica Acta
    DOI
    10.1016/j.electacta.2016.03.015
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S001346861630531X
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.electacta.2016.03.015
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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