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High oxide ion and proton conductivity in a disordered hexagonal perovskite

Research output: Contribution to journalArticlepeer-review


Sacha Fop, Kirstie S. McCombie, Eve J. Wildman, Jan M. S. Skakle, John T. S. Irvine, Paul A. Connor, Cristian Savaniu, Clemens Ritter, Abbie C. Mclaughlin

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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.


Original languageEnglish
Pages (from-to)752–757
Number of pages7
JournalNature Materials
Issue number7
Early online date2 Mar 2020
Publication statusPublished - Jul 2020

    Research areas

  • Fuel cells, Solid-state chemistry

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