Hydrogen separation by nanocrystalline titanium nitride membranes with high hydride ion conductivity
Hydrogen separation by nanocrystalline titanium nitride membranes with high hydride ion conductivity
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DOI：
10.1038/s41560-017-0002-2
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发表时间：
2017-10-01
期刊：
影响因子：
56.7
通讯作者：
Aoki, Yoshitaka
中科院分区：
文献类型：
--
作者：
Kura, Chiharu;Kunisada, Yuji;Aoki, Yoshitaka
用于能源应用和相关工业的纯氢的生产通常依赖于氢通过钯基膜的渗透。然而，钯储量的稀缺性需要开发具有高氢渗透率的经济实惠的替代品。本文报道了混合氢化物离子-电子电导率使氮化钛（广泛用于坚韧和惰性涂层材料）的室温氢渗透性。结合光谱、渗透率和微重测量表明，纳米晶TiNx膜具有增强的晶界扩散的氢化物阴离子与界面钛离子在纳米颗粒上。由于对应的活化能很低(
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 (