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High oxide-ion conductivity through the interstitial oxygen site in Ba7Nb4MoO20-based hexagonal perovskite related oxides

Author

Listed:
  • Masatomo Yashima

    (Tokyo Institute of Technology)

  • Takafumi Tsujiguchi

    (Tokyo Institute of Technology)

  • Yuichi Sakuda

    (Tokyo Institute of Technology)

  • Yuta Yasui

    (Tokyo Institute of Technology)

  • Yu Zhou

    (Department of Materials, Imperial College London)

  • Kotaro Fujii

    (Tokyo Institute of Technology)

  • Shuki Torii

    (Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK))

  • Takashi Kamiyama

    (Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK))

  • Stephen J. Skinner

    (Department of Materials, Imperial College London)

Abstract

Oxide-ion conductors are important in various applications such as solid-oxide fuel cells. Although zirconia-based materials are widely utilized, there remains a strong motivation to discover electrolyte materials with higher conductivity that lowers the working temperature of fuel cells, reducing cost. Oxide-ion conductors with hexagonal perovskite related structures are rare. Herein, we report oxide-ion conductors based on a hexagonal perovskite-related oxide Ba7Nb4MoO20. Ba7Nb3.9Mo1.1O20.05 shows a wide stability range and predominantly oxide-ion conduction in an oxygen partial pressure range from 2 × 10−26 to 1 atm at 600 °C. Surprisingly, bulk conductivity of Ba7Nb3.9Mo1.1O20.05, 5.8 × 10−4 S cm−1, is remarkably high at 310 °C, and higher than Bi2O3- and zirconia-based materials. The high conductivity of Ba7Nb3.9Mo1.1O20.05 is attributable to the interstitial-O5 oxygen site, providing two-dimensional oxide-ion O1−O5 interstitialcy diffusion through lattice-O1 and interstitial-O5 sites in the oxygen-deficient layer, and low activation energy for oxide-ion conductivity. Present findings demonstrate the ability of hexagonal perovskite related oxides as superior oxide-ion conductors.

Suggested Citation

  • Masatomo Yashima & Takafumi Tsujiguchi & Yuichi Sakuda & Yuta Yasui & Yu Zhou & Kotaro Fujii & Shuki Torii & Takashi Kamiyama & Stephen J. Skinner, 2021. "High oxide-ion conductivity through the interstitial oxygen site in Ba7Nb4MoO20-based hexagonal perovskite related oxides," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-020-20859-w
    DOI: 10.1038/s41467-020-20859-w
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    Cited by:

    1. Kei Saito & Masatomo Yashima, 2023. "High proton conductivity within the ‘Norby gap’ by stabilizing a perovskite with disordered intrinsic oxygen vacancies," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    2. Yuta Yasui & Masataka Tansho & Kotaro Fujii & Yuichi Sakuda & Atsushi Goto & Shinobu Ohki & Yuuki Mogami & Takahiro Iijima & Shintaro Kobayashi & Shogo Kawaguchi & Keiichi Osaka & Kazutaka Ikeda & Tos, 2023. "Hidden chemical order in disordered Ba7Nb4MoO20 revealed by resonant X-ray diffraction and solid-state NMR," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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