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    Stable spinel type cobalt and copper oxide electrodes for O2 and H2 evolutions in alkaline solution

    Access Status
    Fulltext not available
    Authors
    Jia, J.
    Li, Xin Yong
    Chen, G.
    Date
    2010
    Type
    Conference Paper
    
    Metadata
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    Citation
    Jia, J. and Li, X.Y. and Chen, G. 2010. Stable spinel type cobalt and copper oxide electrodes for O2 and H2 evolutions in alkaline solution, pp. 8197-8206.
    Source Title
    Electrochimica Acta
    DOI
    10.1016/j.electacta.2010.04.026
    ISSN
    0013-4686
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/4063
    Collection
    • Curtin Research Publications
    Abstract

    The stability of one material, Ti/CuxCo3-xO 4, as anode and also cathode was investigated for electrolysis of alkaline aqueous solution. The electrodes were prepared by thermal decomposition method with x varied from 0 to 1.5. The accelerated life test illustrated that the electrodes with x = 0.3 nominally showed the best performance, with a total service life of 1080 h recorded in 1 M NaOH solution under alternating current direction at 1 A cm-2 and 35 °C. The effects of copper content in electrode coating were examined in terms of electrode stability, surface morphology, coating resistivity and coating compositions. The presence of Cu in the spinel structure of Co3O4 could significantly enhance the electrochemical and physicochemical properties. The trends of crystallographic properties and surface morphology have been analyzed systemically before, during and after the electrodes were employed in alkaline electrolysis. The oxygen evolution would lead to the consumption of the coating material and the progressive cracking of the coating. Along with hydrogen evolution, cobalt oxide could be reduced to metal Co and Co(OH)2 with particle sizes changed to smaller values in crystal and/or amorphous form at the cathode. The formation of Co is the key process for this electrode to serve as both anode and cathode. It is also the main reason leading to the eventual failure of the electrodes. © 2010 Elsevier Ltd. All rights reserved.

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