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

Chiharu Kura, Yuji Kunisada, Etsushi Tsuji, Chunyu Zhu, Hiroki Habazaki, Shinji Nagata, Michael P. Müller, Roger A. De Souza and Yoshitaka Aoki ()
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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

Nature Energy, 2017, vol. 2, issue 10, 786-794

Abstract: 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 (

Date: 2017
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DOI: 10.1038/s41560-017-0002-2

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