Determination of Oxygen Transport Properties from Flux and Driving Force Measurements

Bjarke Thomas Dalslet, Martin Søgaard, Peter Vang Hendriksen

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    Abstract

    We demonstrate that an electrolyte probe can be used to measure the difference in oxygen chemical potential across the surface, when an oxygen flux is forced through an oxygen permeable membrane disk. The oxygen flux as well as the total oxygen chemical potential difference is carefully controlled by an oxygen pump. The developed method is tested on a (La0.6Sr0.4)0.99Co0.2Fe0.8O3−delta membrane. An La0.75Sr0.25MnO3/Y0.16Zr0.84O1.92/La0.75Sr0.25MnO3 oxygen pump was attached to one side of the membrane. A conical Ce0.9Gd0.1O1.95 (CG10) electrolyte probe was pressed against the other side of the membrane. The voltage difference between the base and the tip of the CG10 probe was recorded with an applied oxygen flux through the membrane. This voltage was used to extract precise values of the surface exchange rate constant, kO. Using these values of kO, the vacancy diffusion factor, Dv0, could be extracted from data of the flux and the oxygen chemical potential difference across the membrane measured with the oxygen pump. Furthermore, upon a gas change, the transient voltage signals of the oxygen pump and the probe could be fitted to give values of Dv0 and kO.
    Original languageEnglish
    JournalJournal of The Electrochemical Society
    Volume154
    Issue number12
    Pages (from-to)B1276-B1287
    ISSN0013-4651
    DOIs
    Publication statusPublished - 2007

    Bibliographical note

    Copyright The Electrochemical Society, Inc. [2007]. 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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