LaNixMn0.26Aly合金的吸放氢性能研究

Hydrogen Absorption/Desorption Properties of LaNixMn0.26Aly Alloys

摘要:

对LaNixMn0.26Aly合金的储氢性能进行了研究。结果表明，与LaNi4.61Mn0.26Al0.13合金相比，LaNi4.5Mn0.26Al0.13合金的晶格常数和晶胞体积均变大，吸氢平台压力略有降低，放氢平台压力基本不变，滞后因子有所改善，储氢容量略有减少，氢化物生成焓绝对值变大，氢化物稳定性增加；对于LaNi4.4Mn0.26Al0.34合金，Al替代部分Ni使合金的晶格常数和晶胞体积变大，吸放氢平台压力明显降低，滞后因子明显改善，吸氢动力学性能显著提高，氢化物生成焓绝对值变大，氢化物更加稳定，但储氢容量有所减少

Abstract:

The hydrogen storage properties of LaNixMn0.26Aly alloys were investigated. Results show that when y=0.13, the lattice parameters (a and c) and the lattice volume V are increased, the absorption plateau pressure is slightly decreased, the desorption plateau pressure is almost the same and the hysteresis factor is improved, while the hydrogen intake capacity is impaired, and the stability of metal hydride is enhanced with decrease of the x. As for LaNi4.4Mn0.26Al0.34 alloy, the lattice parameters and cell volumes are increased, the absorption/desorption plateau pressure is obviously decreased, the hysteresis factor and the absorption kinetics are greatly improved, while the hydrogen content is obviously impaired with Al substituting for partial Ni