Effect of hydrogen absorption/desorption cycling on hydrogen storage performance of LaNi4.25Al0.75
Effect of hydrogen absorption/desorption cycling on hydrogen storage performance of LaNi4.25Al0.75
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DOI：
10.1016/j.jallcom.2006.11.112
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发表时间：
2008-04
影响因子：
6.2
通讯作者：
H. H. Cheng-H.;H. Yang;Shenlan Li;Xuguang Deng;D. M. Chen;K. Yang
中科院分区：
文献类型：
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作者：
H. H. Cheng-H.;H. Yang;Shenlan Li;Xuguang Deng;D. M. Chen;K. Yang
研究了吸放氢循环对LaNi4.25Al0.75合金储氢性能的影响。在363、383和403 K下测量了初始活化和1000次吸附/解吸循环后的吸附/解吸和吸附动力学的压力-组成（PC）等温线。在长期循环后，平台压力和储存容量吸收动力学略有变化，而观察到吸收动力学的显著退化。循环可能导致大块合金粉化。与初始活化后的粒径分布（0.78-301μ m）相比，1000次循环后的粒径分布（0.36-103μm）更窄，体积平均直径从34.81 μ m减小到11.34μm。从LaNi_（4.25）Al_（0.75）的析氢性能、粉化现象和充氢过程中产生的杂质等方面解释了1000次循环后LaNi_（4.25）Al_（0.75）合金吸放氢性能的变化。
The effect of hydrogen absorption/desorption cycling on the hydrogen storage properties of LaNi4.25Al0.75was investigated. The pressure-composition (PC) isotherms for absorption/desorption and absorption kinetics were measured at 363, 383 and 403K, for both after initial activation and 1000 absorption/desorption cycles. The plateau pressures and storage capacity absorption kinetics were slightly changed after long-term cycles, while significant degradation of absorption kinetics was observed. Cycling could result in pulverization of the bulk alloy. The particle size distribution after 1000 cycles was narrower (0.36–103μm) compared to that after initial activation (0.78–301μm), with volume mean diameter decreasing from 34.81 to 11.34μm. The change of hydrogen absorption/desorption properties of LaNi4.25Al0.75over 1000 cycles has been explained by considering the disproportionation property of LaNi4.25Al0.75, the pulverization phenomena and the impurities from charging hydrogen employed in cycling.