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    Electrochemical behaviour and surface analysis of chalcopyrite in alkaline glycine solutions

    Access Status
    Fulltext not available
    Authors
    O'Connor, G.
    Lepkova, Katerina
    Eksteen, Jacques
    Oraby, Elsayed
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    O'Connor, G. and Lepkova, K. and Eksteen, J. and Oraby, E. 2018. Electrochemical behaviour and surface analysis of chalcopyrite in alkaline glycine solutions. Hydrometallurgy. 182: pp. 32-43.
    Source Title
    Hydrometallurgy
    DOI
    10.1016/j.hydromet.2018.10.009
    ISSN
    0304-386X
    School
    School of Molecular and Life Sciences (MLS)
    URI
    http://hdl.handle.net/20.500.11937/71062
    Collection
    • Curtin Research Publications
    Abstract

    © 2018 Elsevier B.V. Electrochemical experiments with a chalcopyrite rotating disk electrode were carried out in alkaline glycine solutions. This showed no apparent passivation behaviour during anodic dissolution that is observed in acid solutions. The current increased with applied potential from the open circuit potential with no resemblance to the passivation region seen in acid solutions. A loosely held porous layer developed on the surface consisting largely of iron oxyhydroxides that had a limited effect on the anodic current. Elemental sulfur and a disulfide species were detected using XPS and Raman spectroscopy but did not passivate the surface as has been proposed for acid solutions. The disulfide species is sometimes used to infer a metal deficient sulfide or polysulfide that is responsible for passivation but in this study it had no passivating influence. Current-potential curves showed features of a non-ideal semiconductor that were explained by charge transfer via surface states.

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