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A fast ceramic mixed OH−/H+ ionic conductor for low temperature fuel cells

Author

Listed:
  • Peimiao Zou

    (University of Warwick)

  • Dinu Iuga

    (University of Warwick)

  • Sanliang Ling

    (University of Nottingham)

  • Alex J. Brown

    (University of Warwick)

  • Shigang Chen

    (University of Warwick)

  • Mengfei Zhang

    (University of Warwick)

  • Yisong Han

    (University of Warwick)

  • A. Dominic Fortes

    (Harwell Science and Innovation Campus)

  • Christopher M. Howard

    (Harwell Science and Innovation Campus)

  • Shanwen Tao

    (University of Warwick
    Monash University)

Abstract

Low temperature ionic conducting materials such as OH− and H+ ionic conductors are important electrolytes for electrochemical devices. Here we show the discovery of mixed OH−/H+ conduction in ceramic materials. SrZr0.8Y0.2O3-δ exhibits a high ionic conductivity of approximately 0.01 S cm−1 at 90 °C in both water and wet air, which has been demonstrated by direct ammonia fuel cells. Neutron diffraction confirms the presence of OD bonds in the lattice of deuterated SrZr0.8Y0.2O3-δ. The OH− ionic conduction of CaZr0.8Y0.2O3-δ in water was demonstrated by electrolysis of both H218O and D2O. The ionic conductivity of CaZr0.8Y0.2O3-δ in 6 M KOH solution is around 0.1 S cm−1 at 90 °C, 100 times higher than that in pure water, indicating increased OH− ionic conductivity with a higher concentration of feed OH− ions. Density functional theory calculations suggest the diffusion of OH− ions relies on oxygen vacancies and temporarily formed hydrogen bonds. This opens a window to discovering new ceramic ionic conducting materials for near ambient temperature fuel cells, electrolysers and other electrochemical devices.

Suggested Citation

  • Peimiao Zou & Dinu Iuga & Sanliang Ling & Alex J. Brown & Shigang Chen & Mengfei Zhang & Yisong Han & A. Dominic Fortes & Christopher M. Howard & Shanwen Tao, 2024. "A fast ceramic mixed OH−/H+ ionic conductor for low temperature fuel cells," Nature Communications, Nature, vol. 15(1), pages 1-20, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45060-1
    DOI: 10.1038/s41467-024-45060-1
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    References listed on IDEAS

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