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Hydrogen separation by nanocrystalline titanium nitride membranes with high hydride ion conductivity

Author

Listed:
  • Chiharu Kura

    (Hokkaido University)

  • Yuji Kunisada

    (Hokkaido University)

  • Etsushi Tsuji

    (Tottori University)

  • Chunyu Zhu

    (Hokkaido University)

  • Hiroki Habazaki

    (Hokkaido University)

  • Shinji Nagata

    (Tohoku University)

  • Michael P. Müller

    (RWTH Aachen University and JARA-FIT)

  • Roger A. De Souza

    (RWTH Aachen University and JARA-FIT)

  • Yoshitaka Aoki

    (Hokkaido University
    JST-PRESTO)

Abstract

The production of pure hydrogen for use in energy applications and related industries often relies on the permeation of hydrogen through palladium-based membranes. However, the scarcity of Pd reserves necessitates the development of affordable alternatives with high hydrogen permeability. Here we report room-temperature hydrogen permeability of titanium nitrides (widely used as tough and inert coating materials) enabled by mixed hydride ion–electron conductivity. Combined spectroscopic, permeability and microgravimetric measurements reveal that nanocrystalline TiN x membranes feature enhanced grain-boundary diffusion of hydride anions associated with interfacial Ti cations on nanograins. Since the corresponding activation energies are very low (

Suggested Citation

  • Chiharu Kura & Yuji Kunisada & Etsushi Tsuji & Chunyu Zhu & Hiroki Habazaki & Shinji Nagata & Michael P. Müller & Roger A. De Souza & Yoshitaka Aoki, 2017. "Hydrogen separation by nanocrystalline titanium nitride membranes with high hydride ion conductivity," Nature Energy, Nature, vol. 2(10), pages 786-794, October.
    • Handle: RePEc:nat:natene:v:2:y:2017:i:10:d:10.1038_s41560-017-0002-2
    DOI: 10.1038/s41560-017-0002-2
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