期刊
NATURE ENERGY
卷 2, 期 10, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41560-017-0002-2
关键词
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资金
- PRESTO 'Creation of Innovative Core Technology for Manufacture and Use of Energy Carriers from Renewable Energy' project - Japan Science and Technology Agency, Japan
- 'Nanotechnology Platform' programme of the MEXT Japan
- MEXT Japan through the programme for Leading Graduate Schools (Hokkaido University 'Ambitious Leader's Program')
- Grants-in-Aid for Scientific Research [17K14114] Funding Source: KAKEN
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 TiNx membranes feature enhanced grain-boundary diffusion of hydride anions associated with interfacial Ti cations on nanograins. Since the corresponding activation energies are very low (<10kJmol(-1)), these membranes yield a considerably higher room-temperature hydrogen flux than Pd membranes of equivalent thickness. Overall, the current study establishes general guidelines for developing hydride ion transport membranes based on a simple transition metal nitride for hydrogen purification, membrane reactors and other applications.
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