Study on hydrogen storage properties of LaNi3.8Al1.2−xMnx alloys |
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| Authors: | SL Li P Wang W Chen G Luo XB Han DM Chen K Yang |
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| Affiliation: | 1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. Graduate School of Chinese Academy of Sciences, Beijing 100049, China;3. The 404 Limited, China National Nuclear Corporation, Lanzhou 732850, China |
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| Abstract: | Effects of the Mn substitution on microstructures and hydrogen absorption/desorption properties of LaNi3.8Al1.2−xMnx (x = 0.2, 0.4, 0.6) hydrogen storage alloys were investigated. The pressure-composition (PC) isotherms and absorption kinetics were measured in a temperature range of 433 K ≤ T ≤ 473 K by the volumetric method. XRD analyses showed that with the increase of the Mn content in the LaNi3.8Al1.2−xMnx alloys, the lattice parameter a was decreased, c increased and the unit cell volume V reduced. It was found that the absorption/desorption plateau pressure was increased and the hydrogen storage capacity was enhanced with the increase of Mn content. The absorption/desorption plateau pressure of the alloys was linearly changed with the Mn content x and the lattice parameter a, while the hydrogen storage capacity was linearly increased with the increase of c/a ratio. It was also found that the slope factor Sf was closely correlated with the lattice strain of the alloys. |
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| Keywords: | Metal hydride (A) Hydrogen absorbing materials (A) Gas-solid reactions (B) Thermodynamic properties (C) |
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