La-doped Ba0.5Sr0.5Co0.8Fe0.2O3-δ as cathode for protonic-conducting solid oxide fuel cells with enhanced structure stability

Yun Xie, Xueyu Hu, Nai Shi, Ranran Peng, Ming Chen, Changrong Xia

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    3 Citations (Scopus)

    Abstract

    As a highly efficient energy conversion device, proton-conducting solid oxide fuel cells (PCFCs) have attracted intensive attention. Unfortunately, its practical application is limited by the catalytic activity and stability of the cathode. Here, we report a novel electrochemical catalyst of 10 mol.% La modified Ba0.5Sr0.5Co0.8Fe0.2O3-? cathode, showing much improved stability under typical PCFCs working conditions. XRD patterns confirm that La0.1Ba0.4Sr0.5Co0.8Fe0.2O3-? maintains cubic structure after treated in humid air or 10% H2O - 90% N2. In addition, La0.1Ba0.4Sr0.5Co0.8Fe0.2O3-? also demonstrates outstanding oxygen transport properties with a chemical surface exchange coefficient of 2.3∗10-3 cm s-1 at 700 ?C, and the assembled single cells using this novel material present a minimal polarization resistance of 0.05 ? cm2 at 700 ?C. The high stability and great electrochemical performance of La0.1Ba0.4Sr0.5Co0.8Fe0.2O3-? may result from the stronger interaction in the La-O bond than in Ba-O. This work provides a strategy to modify materials properties via optimizing the interaction between metal and oxygen ions in the oxide lattice.

    Original languageEnglish
    Title of host publication17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021
    PublisherIOP Publishing Ltd.
    Pages1525-1535
    Number of pages11
    Edition1
    ISBN (Electronic)9781607685395
    DOIs
    Publication statusPublished - 2021
    Event17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021 - Stockholm, Sweden
    Duration: Jul 18 2021Jul 23 2021

    Publication series

    NameECS Transactions
    Number1
    Volume103
    ISSN (Print)1938-6737
    ISSN (Electronic)1938-5862

    Conference

    Conference17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021
    Country/TerritorySweden
    CityStockholm
    Period7/18/217/23/21

    All Science Journal Classification (ASJC) codes

    • Engineering(all)

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