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

Li, Ming, Niu, Hongjun, Druce, John, Téllez, Helena, Ishihara, Tatsumi, Kilner, John A, Gasparyan, Hripsime, Pitcher, Michael J, Xu, Wen, Shin, J Felix
et al (show 7 more authors) (2020) A CO2 -Tolerant Perovskite Oxide with High Oxide Ion and Electronic Conductivity. Advanced Materials, 32 (4). e1905200-.

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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 Ba0.5 Sr0.5 Co0.8 Fe0.2 O3- 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 Bi0.15 Sr0.85 Co0.8 Fe0.2 O3- 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.

Item Type: Article
Uncontrolled Keywords: mixed ionic-electronic conductors, oxygen separation membranes, perovskites, solid oxide fuel cells, surface segregation
Depositing User: Symplectic Admin
Date Deposited: 12 Dec 2019 09:22
Last Modified: 19 Jan 2023 00:13
DOI: 10.1002/adma.201905200
Open Access URL: https://doi.org/10.1002/adma.201905200
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3066058