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

doi:10.1002/adma.201905200

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

Adv Mater. 2020 Jan;32(4):e1905200. doi: 10.1002/adma.201905200. Epub 2019 Dec 1.

Authors

Ming Li¹, Hongjun Niu¹, John Druce², Helena Téllez², Tatsumi Ishihara², John A Kilner^{2

3}, Hripsime Gasparyan¹, Michael J Pitcher¹, Wen Xu¹, J Felix Shin¹, Luke M Daniels¹, Leanne A H Jones⁴, Vin R Dhanak⁴, Dingyue Hu¹, Marco Zanella¹, John B Claridge¹, Matthew J Rosseinsky¹

Affiliations

¹ Department of Chemistry, University of Liverpool, Crown Street, Liverpool, L69 7ZD, UK.
² International Institute for Carbon-Neutral Energy Research (wpi-I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan.
³ Department of Materials, Imperial College London, London, SW7 2AZ, UK.
⁴ Department of Physics and Stephenson Institute for Renewable Energy, University of Liverpool, Liverpool, L69 7ZF, UK.

PMID: 31788886
DOI: 10.1002/adma.201905200

Abstract

Mixed ionic-electronic conductors (MIECs) that display high oxide ion conductivity (σ_o ) and electronic conductivity (σ_e ) constitute an important family of electrocatalysts for a variety of applications including fuel cells and oxygen separation membranes. Often MIECs exhibit sufficient σ_e but inadequate σ_o . It has been a long-standing challenge to develop MIECs with both high σ_o and stability under device operation conditions. For example, the well-known perovskite oxide Ba_0.5 Sr_0.5 Co_0.8 Fe_0.2 O_3- _δ (BSCF) exhibits exceptional σ_o and electrocatalytic activity. The reactivity of BSCF with CO₂ , however, limits its use in practical applications. Here, the perovskite oxide Bi_0.15 Sr_0.85 Co_0.8 Fe_0.2 O_3- _δ (BiSCF) is shown to exhibit not only exceptional bulk transport properties, with a σ_o 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.

Keywords: mixed ionic-electronic conductors; oxygen separation membranes; perovskites; solid oxide fuel cells; surface segregation.

Abstract

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