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    Quantification of passivation layer growth in inert anodes for molten salt electrochemistry by in situ energy-dispersive diffraction

    227638.pdf (1.297Mb)
    Access Status
    Open access
    Authors
    Rowles, Matthew
    Styles, M.
    Madsen, I.
    Scarlett, N.
    McGregor, K.
    Riley, D.
    Snook, G.
    Urban, A.
    Connolley, T.
    Reinhard, C.
    Date
    2012
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Rowles, M. and Styles, M. and Madsen, I. and Scarlett, N. and McGregor, K. and Riley, D. and Snook, G. et al. 2012. Quantification of passivation layer growth in inert anodes for molten salt electrochemistry by in situ energy-dispersive diffraction. Journal of Applied Crystallography. 45 (1): pp. 28-37.
    Source Title
    Journal of Applied Crystallography
    DOI
    10.1107/S0021889811044104
    ISSN
    0021-8898
    URI
    http://hdl.handle.net/20.500.11937/25298
    Collection
    • Curtin Research Publications
    Abstract

    An in situ energy-dispersive X-ray diffraction experiment was undertaken on operational titanium electrowinning cells to observe the formation of rutile (TiO2) passivation layers on Magnéli-phase (TinO2n-1; n = 4-6) anodes and thus determine the relationship between passivation layer formation and electrolysis time. Quantitative phase analysis of the energy-dispersive data was undertaken using a crystal-structure-based Rietveld refinement. Layer formation was successfully observed and it was found that the rate of increase in layer thickness decreased with time, rather than remaining constant as observed in previous studies. The limiting step in rutile formation is thought to be the rate of solid-state diffusion of oxygen within the anode structure.

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