NDLI: The Influence of Fe on the Structure and Hydrogen Sorption Properties of Ti-V-Based Metal Hydrides

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The Influence of Fe on the Structure and Hydrogen Sorption Properties of Ti-V-Based Metal Hydrides

Content Provider	MDPI
Author	Magnus, M. Nygård Magnus, H. Sørby Grimenes, Arne A. Hauback, Bjørn C.
Copyright Year	2020
Abstract	Ti-V-based metal hydrides have decent overall performance as hydrogen storage materials, but V is expensive and it is therefore tempting to replace it by less expensive ferrovanadium containing about 20% Fe. In the present work we have investigated how Fe influences the structure and hydrogen storage properties of (Ti_0.7V_0.3)_1−zFe_z alloys with $\begin{matrix} e r r o r t y p e c e z \end{matrix} \in {0,$ 0.03, 0.06, 0.1, 0.2, 0.3} using synchrotron radiation powder X-ray diffraction, thermogravimetric analysis, differential scanning calorimetry and manometric measurements performed in a Sieverts apparatus. The alloys form body-centered cubic (bcc) crystal structures for all considered values of z, and the addition of Fe causes the unit cell to contract. When exposed to hydrogen gas, the bcc alloys form face-centered cubic (fcc) hydrides if $\begin{matrix} e r r o r t y p e c e z \end{matrix} \leq 0.1$ while other hydrogen-containing phases are formed for higher Fe-contents. The hydrogen capacities of the fcc hydrides at 20 bar are not significantly influenced by the addition of Fe and reach 3.2(3) wt% in (Ti_0.7V_0.3)_0.9Fe_0.1H_1.6(2). For higher Fe contents the hydrogen capacity is decreased. The absorption kinetics are fast and the reactions are complete within minutes when the alloys are exposed to 20 bar H₂ at room temperature. Increasing Fe content reduces the desorption enthalpy, onset temperature and activation energy.
Starting Page	2874
e-ISSN	19961073
DOI	10.3390/en13112874
Journal	Energies
Issue Number	11
Volume Number	13
Language	English
Publisher	MDPI
Publisher Date	2020-06-04
Access Restriction	Open
Subject Keyword	Energies Inorganic Chemistry Metal Hydrides Hydrogen Storage in Situ Synchrotron Radiation Powder X-ray Diffraction Activation Energy for Hydrogen Desorption
Content Type	Text
Resource Type	Article

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