Study on hydrogen storage properties of LaNi3.8Al1.2−xMnx alloys
International Journal of Hydrogen Energy(2010)
摘要
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 433K ≤ T ≤ 473K 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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关键词
Metal hydride (A),Hydrogen absorbing materials (A),Gas-solid reactions (B),Thermodynamic properties (C)
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