High oxide ion and proton conductivity in a disordered hexagonal perovskite

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

Research output: Contribution to journalArticlepeer-review

128 Citations (Scopus)
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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


  • Fuel cells
  • Solid-state chemistry


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