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    Anomalous Li Storage Capability in Atomically Thin Two-Dimensional Sheets of Nonlayered MoO2

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    Type
    Article
    Authors
    Xia, Chuan cc
    Zhou, Yungang
    Velusamy, Dhinesh
    Farah, Abdiaziz A.
    Li, Peng cc
    Jiang, Qiu cc
    Odeh, Ihab N.
    Wang, Zhiguo cc
    Zhang, Xixiang cc
    Alshareef, Husam N. cc
    KAUST Department
    Functional Nanomaterials and Devices Research Group
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    SABIC - Corporate Research and Innovation Center (CRI) at KAUST
    Date
    2018-02-05
    Online Publication Date
    2018-02-05
    Print Publication Date
    2018-02-14
    Permanent link to this record
    http://hdl.handle.net/10754/627238
    
    Metadata
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    Abstract
    Since the first exfoliation and identification of graphene in 2004, research on layered ultrathin two-dimensional (2D) nanomaterials has achieved remarkable progress. Realizing the special importance of 2D geometry, we demonstrate that the controlled synthesis of nonlayered nanomaterials in 2D geometry can yield some unique properties that otherwise cannot be achieved in these nonlayered systems. Herein, we report a systematic study involving theoretical and experimental approaches to evaluate the Li-ion storage capability in 2D atomic sheets of nonlayered molybdenum dioxide (MoO2). We develop a novel monomer-assisted reduction process to produce high quality 2D sheets of nonlayered MoO2. When used as lithium-ion battery (LIB) anodes, these ultrathin 2D-MoO2 electrodes demonstrate extraordinary reversible capacity, as high as 1516 mAh g–1 after 100 cycles at the current rate of 100 mA g–1 and 489 mAh g–1 after 1050 cycles at 1000 mA g–1. It is evident that these ultrathin 2D sheets did not follow the normal intercalation-cum-conversion mechanism when used as LIB anodes, which was observed for their bulk analogue. Our ex situ XPS and XRD studies reveal a Li-storage mechanism in these 2D-MoO2 sheets consisting of an intercalation reaction and the formation of metallic Li phase. In addition, the 2D-MoO2 based microsupercapacitors exhibit high areal capacitance (63.1 mF cm–2 at 0.1 mA cm–2), good rate performance (81% retention from 0.1 to 2 mA cm–2), and superior cycle stability (86% retention after 10,000 cycles). We believe that our work identifies a new pathway to make 2D nanostructures from nonlayered compounds, which results in an extremely enhanced energy storage capability.
    Citation
    Xia C, Zhou Y, Velusamy DB, Farah AA, Li P, et al. (2018) Anomalous Li Storage Capability in Atomically Thin Two-Dimensional Sheets of Nonlayered MoO2. Nano Letters 18: 1506–1515. Available: http://dx.doi.org/10.1021/acs.nanolett.7b05298.
    Sponsors
    Research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST), and by Saudi Basic Industries Corporation (SABIC). The authors like to also thank Professor Bruce Dunn, UCLA, for useful discussions.
    Publisher
    American Chemical Society (ACS)
    Journal
    Nano Letters
    DOI
    10.1021/acs.nanolett.7b05298
    PubMed ID
    29389132
    Additional Links
    https://pubs.acs.org/doi/10.1021/acs.nanolett.7b05298
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.nanolett.7b05298
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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