High oxide ion and proton conductivity in a disordered hexagonal perovskite
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Oxide ion and proton conductors, which exhibit high conductivity at intermediate temperature, are necessary to improve the performance of ceramic fuel cells. The crystal structure plays a pivotal role in defining the ionic conduction properties, and the discovery of new materials is a challenging research focus. Here, we show that the undoped hexagonal perovskite Ba7Nb4MoO20 supports pure ionic conduction with high proton and oxide ion conductivity at 510 °C (the bulk conductivity is 4.0 mS cm−1), and hence is an exceptional candidate for application as a dual-ion solid electrolyte in a ceramic fuel cell that will combine the advantages of both oxide ion and proton-conducting electrolytes. Ba7Nb4MoO20 also showcases excellent chemical and electrical stability. Hexagonal perovskites form an important new family of materials for obtaining novel ionic conductors with potential applications in a range of energy-related technologies.
Fop , S , McCombie , K S , Wildman , E J , Skakle , J M S , Irvine , J T S , Connor , P A , Savaniu , C , Ritter , C & Mclaughlin , A C 2020 , ' High oxide ion and proton conductivity in a disordered hexagonal perovskite ' , Nature Materials , vol. 19 , no. 7 , pp. 752–757 . https://doi.org/10.1038/s41563-020-0629-4
Copyright © The Author(s), under exclusive licence to Springer Nature Limited 2020. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1038/s41563-020-0629-4
DescriptionThis research was supported by the Leverhulme trust and EPSRC (MISE). We also acknowledge STFC-GB for provision of beamtime at the Institut Laue Langevin.
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