Amorphous-cathode-route towards low temperature SOFC

Andrea Cavallaro, Stevin S. Pramana, Enrique Ruiz-Trejo, Peter C. Sherrell, Ecaterina Ware, John A. Kilner, Stephen J. Skinner

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    17 Scopus citations

    Abstract

    Lowering the operating temperature of solid oxide fuel cell (SOFC) devices is one of the major challenges limiting the industrial breakthrough of this technology. In this study we explore a novel approach to electrode preparation employing amorphous cathode materials. La0.8Sr0.2CoO3−δ dense films have been deposited at different temperatures using pulsed laser deposition on silicon substrates. Depending on the deposition temperature, textured polycrystalline or amorphous films have been obtained. Isotope exchange depth profiling experiments reveal that the oxygen diffusion coefficient of the amorphous film increased more than four times with respect to the crystalline materials and was accompanied by an increase of the surface exchange coefficient. No differences in the surface chemical composition between amorphous and crystalline samples were observed. Remarkably, even if the electronic conductivities measured by the Van Der Pauw method indicate that the conductivity of the amorphous material was reduced, the overall catalytic properties of the cathode itself were not affected. This finding suggests that the rate limiting step is the oxygen mobility and that the local electronic conductivity in the amorphous cathode surface is enough to preserve its catalytic properties. Different cathode materials have also been tested to prove the more general applicability of the amorphous-cathode route.
    Original languageEnglish (US)
    Pages (from-to)862-875
    Number of pages14
    JournalSustainable Energy & Fuels
    Volume2
    Issue number4
    DOIs
    StatePublished - 2018

    Bibliographical note

    KAUST Repository Item: Exported on 2020-10-01
    Acknowledgements: Authors acknowledge funding from the EPSRC grant (EP/M014142/1). AC and SP would like also to acknowledge the support of King Abdullah University of Science and Technology, who partially funded this work through the academic excellence alliance programme. We acknowledge Dr Antonio Bertei for the helpful discussion about the EIS analysis and Miss Celeste van den Bosch for the LSMCO target preparation.
    This publication acknowledges KAUST support, but has no KAUST affiliated authors.

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