High oxide ion and proton conductivity in a disordered hexagonal perovskite

Sacha Fop (Corresponding Author), Kirstie Sarah Mccombie, Eve Wildman, Jan M. S. Skakle, John T S Irvine, Paul Alexander Connor, Cristian Savaniu, Clemens Ritter, Abbie C McLaughlin* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

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
JournalNature materials
Early online date2 Mar 2020
DOIs
Publication statusE-pub ahead of print - 2 Mar 2020

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Keywords

  • CERAMIC FUEL-CELLS
  • TEMPERATURE
  • STABILITY
  • TRANSPORT
  • PERFORMANCE
  • MECHANISMS
  • TRANSITION
  • CONDUCTORS
  • TOLERANCE
  • BA2IN2O5

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