Surface segregation and inter-diffusion of cations and impurities in microelectrodes for solid oxide fuel cells and electrolysers

H. Téllez, J. Druce, Y. Shi, M. Kubicek, Neil J. Simrick, J. L.M. Rupp, T. Ishihara, J. Kilner

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

    2 Citations (Scopus)

    Abstract

    The surface segregation and inter-diffusion of cations and impurities in La0.6Sr0.4Co0.8Fe0.2O3-δ (LSCF) electrode structures micro-patterned on a Zr0.84Y0.16O1.92 (YSZ) single crystal was investigated by high-resolution Time-of-Flight Secondary Ion Mass Spectrometry and Low-Energy Ion Scattering. The outermost and near surface of the microelectrodes showed significant changes after patterning and electrochemical testing of the cell. As occurring in bulk LSCF ceramics, Sr segregation towards the surface is observed after annealing at 500°C. Furthermore, the electrode showed that impurities (i.e. Na, Si and Ca) originating from the YSZ electrolyte bulk migrate actively to the LSCF electrode during electrochemical testing. The impurity migration has implications for oxygen surface exchange at the cathodeelectrolyte and air interface for solid oxide fuel cells: the electrolyte YSZ surface becomes cleaner whereas the segregation of Sr to the LSCF outer surface seems to be suppressed with respect to the operation time of the device.

    Original languageEnglish
    Title of host publicationSolid-Gas Electrochemical Interfaces � SGEI 1
    EditorsE. Ivers-Tiffee, M. B. Mogensen, S. B. Adler, T. Kawada
    PublisherElectrochemical Society Inc.
    Pages69-77
    Number of pages9
    Edition2
    ISBN (Electronic)9781607685395
    DOIs
    Publication statusPublished - 2015
    Event1st Symposium on Solid-Gas Electrochemical Interfaces, SGEI 2015 - 227th ECS Meeting - Chicago, United States
    Duration: May 24 2015May 28 2015

    Publication series

    NameECS Transactions
    Number2
    Volume66
    ISSN (Print)1938-5862
    ISSN (Electronic)1938-6737

    Other

    Other1st Symposium on Solid-Gas Electrochemical Interfaces, SGEI 2015 - 227th ECS Meeting
    Country/TerritoryUnited States
    CityChicago
    Period5/24/155/28/15

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

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