Evaluation of LSF based SOFC Cathodes using Cone-shaped Electrodes

Kent Kammer Hansen, Mogens Bjerg Mogensen

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    Abstract

    Seven La1-xSrxFeO3-delta (x = 0, 0.05, 0.15, 0.25, 0.35, 0.50, 0.70) based perovskites were synthesized using the glycine-nitrate method. The La1-xSrxFeO3-delta compounds were characterized with powder X-ray diffraction and electrochemical impedance spectroscopy on cone-shaped electrodes using a Ce1.9Gd0.1O1.95 electrolyte. The activity of the La1-xSrxFeO3-delta based perovskites towards the electrochemical reduction of oxygen was strongly dependent of the strontium content, the activity being highest for the composition La0.85Sr0.15FeO3-delta. The results indicates that Fe(III) is the catalytic active specie towards the electrochemical reduction of oxygen in a solid oxide fuel cell on La1-xSrxFeO3-delta compounds. The results also show that oxide ion vacancies in the perovskite structure are important for the electrochemical reduction of oxygen. However, the effect of ordering of oxide ion vacancies for the strontium rich compounds can not be excluded.
    Original languageEnglish
    JournalECS Transactions
    Volume13
    Issue number26
    Pages (from-to)153-160
    ISSN1938-5862
    DOIs
    Publication statusPublished - 2008
    Event213th ECS Meeting: B6 - Ionic and Mixed Conducting Ceramics 6 - Phoenix Convention Center, Phoenix, AZ, United States
    Duration: 18 May 200823 May 2008
    Conference number: 213th
    http://www.electrochem.org/meetings/biannual/213/213.htm

    Conference

    Conference213th ECS Meeting
    Number213th
    LocationPhoenix Convention Center
    CountryUnited States
    CityPhoenix, AZ
    Period18/05/200823/05/2008
    Internet address

    Bibliographical note

    Copyright The Electrochemical Society, Inc. [2008]. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS).

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