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  • Exploring Aluminum‐Ion Insertion into Magnesium‐Doped Manjiroite (MnO2) Nanorods in Aqueous Solution

    Author(s)
    Joseph, J
    Fernando, JFS
    Sayeed, MA
    Tang, C
    Golberg, D
    Du, A
    Ostrikov, K
    O'Mullane, AP
    Griffith University Author(s)
    Ostrikov, Kostya (Ken)
    Year published
    2020
    Metadata
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    Abstract
    Aqueous aluminum‐ion batteries are promising for sustainable energy storage given the abundance of aluminum and the ease of recycling. However, finding suitable electrode materials that can intercalate Al ions remains challenging. Here, we investigate Mg‐ion‐doped MnO2 nanorods in the manjiroite structure that allow Al‐ion insertion into the open tunnels of this material. The electrode material is characterized before and after Al‐ion insertion with X‐ray diffraction and X‐ray photoelectron spectroscopy, and the insertion process is studied via in situ transmission electron microscopy, which highlights a change in the length ...
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    Aqueous aluminum‐ion batteries are promising for sustainable energy storage given the abundance of aluminum and the ease of recycling. However, finding suitable electrode materials that can intercalate Al ions remains challenging. Here, we investigate Mg‐ion‐doped MnO2 nanorods in the manjiroite structure that allow Al‐ion insertion into the open tunnels of this material. The electrode material is characterized before and after Al‐ion insertion with X‐ray diffraction and X‐ray photoelectron spectroscopy, and the insertion process is studied via in situ transmission electron microscopy, which highlights a change in the length of the MnO2 nanorod. The results indicate that Al ions can be successfully inserted into the MnO2 nanorods, which has also been determined by density functional theory calculations to be an energetically favorable process. The electrochemical data indicate that diffusion‐controlled Al insertion as well as a surface pseudocapacitive effect occur. This indicates that MnO2 nanomaterials synthesized in the presence of metal cations is potentially a viable route for facilitating their use as electrode materials in aqueous Al‐ion batteries or supercapatteries.
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    Journal Title
    ChemElectroChem
    DOI
    https://doi.org/10.1002/celc.202001408
    Subject
    Analytical Chemistry
    Physical Chemistry (incl. Structural)
    Other Chemical Sciences
    Publication URI
    http://hdl.handle.net/10072/400770
    Collection
    • Journal articles

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