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    Electrochemical Synthesis of Highly Ordered Porous Al Scaffolds Melt-Infiltrated with LiBH4 for Hydrogen Storage

    Access Status
    Fulltext not available
    Authors
    Sofianos, Veronica
    Sheppard, Drew
    Silvester, Debbie
    Lee, Junqiao
    Paskevicius, Mark
    Humphries, Terry
    Buckley, Craig
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Sofianos, M. and Sheppard, D. and Silvester, D. and Lee, J. and Paskevicius, M. and Humphries, T. and Buckley, C. 2018. Electrochemical Synthesis of Highly Ordered Porous Al Scaffolds Melt-Infiltrated with LiBH4 for Hydrogen Storage. Journal of the Electrochemical Society. 165 (2): pp. D37-D42.
    Source Title
    Journal of the Electrochemical Society
    DOI
    10.1149/2.0481802jes
    ISSN
    0013-4651
    School
    School of Electrical Engineering, Computing and Mathematical Science (EECMS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP150101708
    Remarks

    © 2018 The Electrochemical Society

    URI
    http://hdl.handle.net/20.500.11937/68839
    Collection
    • Curtin Research Publications
    Abstract

    Two highly ordered porous Al scaffolds were synthesized by applying a soft template assisted electrodeposition method, using an ionic liquid as the electrolyte. Polystyrene (PS) spheres with an average diameter of 399 ± 2 nm or 89 ± 20 nm were deposited on a polished Cu electrode using a dip-coater. An imidazolium-based ionic liquid mixed with aluminium chloride [EMIm]/AlCl3 (40/60 mol%) was used as the electrolyte for the Al electrodeposition. The PS spheres that were used as a soft template were removed after the Al electrodeposition method by chemically dissolving them in tetrahydrofuran (THF). Lithium borohydride (LiBH4) was then melt-infiltrated into the porous Al scaffold. Morphological observations of the dip-coated Cu electrodes with the PS spheres, the as-synthesized porous Al scaffolds, and the LiBH4 melt-infiltrated samples were carried out using Scanning Electron Microscopy (SEM). The scaffolds exhibited a highly ordered porous Al structure with an open network of pores and an average pore size of 355 ± 25 and 56 ± 20 nm respectively. The porous Al acts as a reactive scaffold which interacts with LiBH4 at elevated temperature. Temperature Programmed Desorption (TPD) experiments revealed that the melt-infiltrated LiBH4 samples exhibited faster H2 desorption kinetics in comparison to the bulk material. In particular, the 56 ± 20 nm Al scaffold showed a H2 desorption onset temperature (Tdes) at 100°C which is 250°C lower than for bulk LiBH4. This temperature drop can be attributed to the size reduction of LiBH4 down to the nanoscale, together with the high contact surface area with the Al scaffold.

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      Sofianos, M. Veronica ; Chaudhary, A.; Paskevicius, Mark ; Sheppard, Drew; Humphries, Terry ; Dornheim, M.; Buckley, Craig (2019)
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      A novel approach for confining LiBH4 within a porous aluminium scaffold was applied in order to enhance its hydrogen storage properties, relative to conventional techniques for confining complex hydrides. The porous ...
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