期刊
MATERIALS
卷 14, 期 17, 页码 -出版社
MDPI
DOI: 10.3390/ma14174829
关键词
hydrogen storage; TiFe alloy; equilibrium pressure; activation
类别
资金
- Korea Institute of Science and Technology [2E30993]
- Technology Development Program to Solve Climate Changes of the National Research Foundation - Ministry of Science and ICT of Korea [NRF-2020M1A2A2080881]
- National Research Foundation of Korea [2020M1A2A2080881] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The addition of V in TiFe alloy affects the hydrogenation process by lowering the P-2/P-1 ratio. Ti46Fe47.5V6.5 alloy shows the best performance with approximately 1.5 wt.% of usable capacity within the target pressure range. Ce addition solves the issue of difficulty in activation at room temperature in TiFe-based alloys.
Titanium iron (TiFe) alloy is a room-temperature hydrogen-storage material, and it absorbs hydrogen via a two-step process to form TiFeH and then TiFeH2. The effect of V addition in TiFe alloy was recently elucidated. The V substitution for Ti sublattice lowers P-2/P-1 ratio, where P-1 and P-2 are the equilibrium plateau pressure for TiFe/TiFeH and TiFeH/TiFeH2, respectively, and thus restricts the two-step hydrogenation within a narrow pressure range. The focus of the present investigation was to optimize the V content such that maximum usable storage capacity can be achieved for the target pressure range: 1 MPa for absorption and 0.1 MPa for desorption. The effect of V substitution at selective Ti or Fe sublattices was closely analyzed, and the alloy composition Ti46Fe47.5V6.5 displayed the best performance with ca. 1.5 wt.% of usable capacity within the target pressure range. At the same time, another issue in TiFe-based alloys, which is a difficulty in activation at room temperature, was solved by Ce addition. It was shown that 3 wt.% Ce dispersion in TiFe alloy imparted to it easy room-temperature (RT) activation properties.
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