Hydrogen storage properties of (Ti0.85Zr0.15)1.05Mn1.2Cr0.6V0.1M0.1 (M=Ni,
Fe, Cu) alloys easily activated at room temperature |
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| Authors: | Peng Liu Xiubo Xie Li Xu Xingguo Li and Tong Liu |
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| Institution: | Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan
Road, Beijing 100191, China,Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan
Road, Beijing 100191, China,State Grid Smart Grid Research Institute, Future Science and Technology City Changping, Beijing 102211, China,Beijing National Laboratory for Molecular Sciences (BNLMS), The State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and
Molecular Engineering, Peking University, Beijing 100871, China and Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan
Road, Beijing 100191, China |
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| Abstract: | The (Ti0.85Zr0.15)1.05Mn1.2Cr0.6V0.1M0.1 (M=Ni, Fe, Cu) alloys with a single C14-type Laves phase have been fabricated by arc melting. They are able to be easily activated by one hydrogen absorption and desorption cycle under 4 MPa hydrogen pressure and vacuum at room temperature. Partial substitution of M for Mn results in the increase of hydrogenation and dehydrogenation capacities in an order of Ni < Fe < Cu. M elements increase the absorption and desorption plateau pressure in an order of (Ti0.85Zr0.15)1.05Mn1.2Cr0.6V0.1Cu0.1 < (Ti0.85Zr0.15)1.05Mn1.2Cr0.6V0.1Fe0.1 < (Ti0.85Zr0.15)1.05Mn1.2Cr0.6V0.1Ni0.1. The (Ti0.85Zr0.15)1.05Mn1.2Cr0.6V0.1Cu0.1 alloy has reversible hydrogen capacities of 1.81 wt% at 273 K and 1.58 wt% at 318 K with formation enthalpy (ΔHab) of ?20.66 kJ mol?1 and decomposition enthalpy (ΔHde) of 27.37 kJ mol?1. The differences in the hydrogen storage properties can be attributed to the increase of the interstitial size for hydrogen accommodation caused by the increase of unit cell volumes in the order of (Ti0.85Zr0.15)1.05Mn1.2Cr0.6V0.1Ni0.1 < (Ti0.85Zr0.15)1.05Mn1.2Cr0.6V0.1Fe0.1 < (Ti0.85Zr0.15)1.05Mn1.2Cr0.6V0.1Cu0.1. |
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| Keywords: | Titanium-manganese based alloy
Laves phase
Unit cell volume
Activation properties
Hydrogen storage properties |
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