A CO2-Tolerant Perovskite Oxide with High Oxide Ion and Electronic Conductivity

Ming Li, Hongjun Niu, John Druce, Helena Téllez, Tatsumi Ishihara, John A. Kilner, Hripsime Gasparyan, Michael J. Pitcher, Wen Xu, J. Felix Shin, Luke M. Daniels, Leanne A.H. Jones, Vin R. Dhanak, Dingyue Hu, Marco Zanella, John B. Claridge, Matthew J. Rosseinsky

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)

    Abstract

    Mixed ionic–electronic conductors (MIECs) that display high oxide ion conductivity (σo) and electronic conductivity (σe) constitute an important family of electrocatalysts for a variety of applications including fuel cells and oxygen separation membranes. Often MIECs exhibit sufficient σe but inadequate σo. It has been a long-standing challenge to develop MIECs with both high σo and stability under device operation conditions. For example, the well-known perovskite oxide Ba0.5Sr0.5Co0.8Fe0.2O3− δ (BSCF) exhibits exceptional σo and electrocatalytic activity. The reactivity of BSCF with CO2, however, limits its use in practical applications. Here, the perovskite oxide Bi0.15Sr0.85Co0.8Fe0.2O3− δ (BiSCF) is shown to exhibit not only exceptional bulk transport properties, with a σo among the highest for known MIECs, but also high CO2 tolerance. When used as an oxygen separation membrane, BiSCF displays high oxygen permeability comparable to that of BSCF and much higher stability under CO2. The combination of high oxide transport properties and CO2 tolerance in a single-phase MIEC gives BiSCF a significant advantage over existing MIECs for practical applications.

    Original languageEnglish
    Article number1905200
    JournalAdvanced Materials
    Volume32
    Issue number4
    DOIs
    Publication statusPublished - Jan 1 2020

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering

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