Molybdate Based Ceramic Negative-Electrode Materials for Solid Oxide Cells

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    Abstract

    Novel molybdate materials with varying Mo valence were synthesized as possible negative-electrode materials for solid oxide cells. The phase, stability, microstructure and electrical conductivity were characterized. The electrochemical activity for H2O and CO2 reduction and H2 and CO oxidation was studied using simplified geometry point-contact electrodes. Unique phenomena were observed for some of the materials - they decomposed into multiple phases and formed a nanostructured surface upon exposure to operating conditions (in certain reducing atmospheres). The new phases and surface features enhanced the electrocatalytic activity and electronic conductivity. The polarization resistances of the best molybdates were two orders of magnitude lower than that of donor-doped strontium titanates. Many of the molybdate materials were significantly activated by cathodic polarization, and they exhibited higher performance for cathodic (electrolysis) polarization than for anodic (fuel cell) polarization, which makes them especially interesting for use in electrolysis electrodes. ©2010 COPYRIGHT ECS - The Electrochemical Society
    Original languageEnglish
    JournalE C S Transactions
    Volume28
    Issue number11
    Pages (from-to)173-192
    ISSN1938-5862
    DOIs
    Publication statusPublished - 2010
    Event217th ECS Meeting - Vancouver, Canada
    Duration: 25 Apr 201030 Apr 2010
    Conference number: 217
    http://www.electrochem.org/meetings/biannual/217/217.htm

    Conference

    Conference217th ECS Meeting
    Number217
    CountryCanada
    CityVancouver
    Period25/04/201030/04/2010
    Internet address

    Bibliographical note

    © 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). The archival version of this work was published in ECS Transactions.

    Keywords

    • Solid Oxide Fuel Cells
    • Fuel Cells and Hydrogen

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