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    Activation and deactivation kinetics of oxygen reduction over a la 0.8Sr0.2Sc0.1Mn0.9O3 cathode

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    Fulltext not available
    Authors
    Zheng, Y.
    Ran, R.
    Shao, Zongping
    Date
    2008
    Type
    Journal Article
    
    Metadata
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    Citation
    Zheng, Y. and Ran, R. and Shao, Z. 2008. Activation and deactivation kinetics of oxygen reduction over a la 0.8Sr0.2Sc0.1Mn0.9O3 cathode. Journal of Physical Chemistry C. 112 (47): pp. 18690-18700.
    Source Title
    Journal of Physical Chemistry C
    DOI
    10.1021/jp806941d
    ISSN
    1932-7447
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/20204
    Collection
    • Curtin Research Publications
    Abstract

    Electrochemical impedance spectroscopy, step current polarization, and cyclic voltammetry were applied to investigate the activation and deactivation kinetics of oxygen reduction over a novel La0.8Sr 0.2Sc0.1Mn0.9O3 (LSSM) cathode material. Oxygen vacancies were created after cathodic polarization for a certain period of time. The generating rate was closely related with oxygen partial pressure of surrounding atmosphere (Po2). polarization time, temperature, and voltage. The in situ created oxygen vacancies could propagate both over the surface and into the bulk of the LSSM electrode after a high cathodic polarization. Both chemical oxidation by ambient air and electrochemical oxidation by anodic polarization were exploited to demonstrate the deactivation mechanism of these in situ created oxygen vacancies. The rate-determining step of oxygen reduction reaction over LSSM electrode before and after the activation was also investigated. It was by oxygen ion surface diffusion at 800 °C in air, while a steady change to an electron-transfer process was observed with decreasing temperature and Po2. © 2008 American Chemical Society.

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