Surface composition and oxygen exchange properties of alkaline earth-free perovskites; LaCo0.6Ni0.4O3

J. Druce, H. Tellez, T. Ishihara, J. A. Kilner

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)

    Abstract

    It is well known that alkaline earth additives in conventional perovskite-based solid oxide electrode materials tend to segregate rapidly to the outer surfaces, which is associated with degradation in device performance. It may be possible to avoid these problems by developing materials which do not contain alkaline earth dopants; however, without the oxygen vacancies introduced by alkaline earth doping, the oxygen transport and electro-catalytic properties may suffer. Here, we investigate oxygen transport in the nickel doped lanthanum cobaltite system, and find that the relatively low oxygen diffusivity is dominated by grain boundary transport. Despite this, at higher temperatures, the surface exchange coefficient is comparable to state-of-the-art Sr doped cobaltites. The surface composition of the annealed samples measured by Low Energy Ion Scattering spectroscopy does not appear different from the as-polished samples, suggesting that the surface composition is indeed more stable for this alkaline earth free material.

    Original languageEnglish
    Title of host publicationIonic and Mixed Conducting Ceramics 10
    EditorsX. D. Zhou, M. B. Mogensen, T. M. Gur, T. Kawada, A. Manivannan
    PublisherElectrochemical Society Inc.
    Pages71-80
    Number of pages10
    Edition7
    ISBN (Electronic)9781607685395
    DOIs
    Publication statusPublished - 2016
    EventSymposium on Ionic and Mixed Conducting Ceramics 10 - 229th ECS Meeting - San Diego, United States
    Duration: May 29 2016Jun 2 2016

    Publication series

    NameECS Transactions
    Number7
    Volume72
    ISSN (Print)1938-6737
    ISSN (Electronic)1938-5862

    Other

    OtherSymposium on Ionic and Mixed Conducting Ceramics 10 - 229th ECS Meeting
    Country/TerritoryUnited States
    CitySan Diego
    Period5/29/166/2/16

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

    Fingerprint

    Dive into the research topics of 'Surface composition and oxygen exchange properties of alkaline earth-free perovskites; LaCo<sub>0.6</sub>Ni<sub>0.4</sub>O<sub>3</sub>'. Together they form a unique fingerprint.

    Cite this