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    Phase-Controllable Cobalt Phosphides Induced through Hydrogel for Higher Lithium Storages

    79938.pdf (1.663Mb)
    Access Status
    Open access
    Authors
    Guo, T.
    Wang, C.
    Wu, H.
    Lee, Junqiao
    Zou, G.
    Hou, H.
    Sun, X.
    Silvester-Dean, Debbie
    Ji, X.
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Guo, T. and Wang, C. and Wu, H. and Lee, J. and Zou, G. and Hou, H. and Sun, X. et al. 2020. Phase-Controllable Cobalt Phosphides Induced through Hydrogel for Higher Lithium Storages. Inorganic Chemistry. 59 (9): pp. 6471-6480.
    Source Title
    Inorganic Chemistry
    DOI
    10.1021/acs.inorgchem.0c00556
    ISSN
    0020-1669
    Faculty
    Faculty of Science and Engineering
    School
    School of Molecular and Life Sciences (MLS)
    Remarks

    This document is the Accepted Manuscript version of a Published Work that appeared in final form in Inorganic Chemistry, copyright © American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.inorgchem.0c00556

    URI
    http://hdl.handle.net/20.500.11937/79836
    Collection
    • Curtin Research Publications
    Abstract

    © 2020 American Chemical Society.

    Transition metal phosphides (TMPs) have gained increased attention in energy storage due to their potential applications for optimizing electrochemical performances. However, their preparation routes usually require highly toxic and flammable phosphorus sources with strict reaction conditions. The existence of multiple energetically favorable stoichiometries also makes it a challenge to achieve phase control of metal phosphides. In this work, we have successfully realized the phase-controllable framework of cobalt phosphide from Co2P to CoP by employing a semi-interpenetrating network (semi-IPN) hydrogel as a precursor. Interestingly, the semi-IPN hydrogel could serve as a self-assembly/sacrificing template to accomplish 3D space confinement, where poly(vinylphosphonic acid) (PVPA) was identified as a prominent phosphorus source due to its strong metal complexation ability and high thermal stability. Furthermore, this route is successfully extended to the synthesis of other TMPs, including Fe2P, Ni2P, and Cu3P. The specific structure of cobalt phosphides gives rise to superior lithium storage performance, showing superior cycling stability (495.2 mAh g-1 after 1000 cycles at 2.0 A g-1). This approach envisions a new outlook on exploitation of essential functional hydrogels for the creation of inorganic materials toward sustainable energy development.

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