Electrochemical Reduction of Oxygen and Nitric Oxide at Low Temperature on La1−xSrxCoO3−delta Cathodes

Kent Kammer Hansen

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    Abstract

    Six La1-xSrxCoO3- (x= 0, 0.05, 0.15, 0.25, 0.35, 0.50) perovskites were synthesised and characterised by powder XRD and cyclic voltammetry on cone-shaped electrodes in either air or nitric oxide in argon at 200, 300 and 400oC. At 200oC the current densities in air was highest for the strontium free cobaltite, whereas the current densities was highest for La0.95Sr0.05CoO3- in the nitric oxide containing atmosphere. This was also the compound with the highest INO/IO2 current ratio at 200oC. At higher temperatures a limiting cathodic current was observed for all of the cobaltite’s, except La0.50Sr0.50CoO3-, in both air and the nitric oxide containing atmosphere. This was attributed to a rate limiting chemical step (i.e. dissociation of oxygen or nitric oxide) in the reaction sequence.
    Original languageEnglish
    JournalJournal of The Electrochemical Society
    Volume157
    Issue number9
    Pages (from-to)P79-P82
    ISSN0013-4651
    DOIs
    Publication statusPublished - 2010

    Bibliographical note

    Copyright The Electrochemical Society, Inc. [2010]. 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).

    Keywords

    • Fuel Cells and hydrogen
    • Flue gas purification

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