Effect of hydrogen absorption/desorption cycling on hydrogen storage performance of LaNi4.25Al0.75

被引：53

作者：

Cheng, H. H. ^{[1
,3
]}

Yang, H. G. ^{[2
]}

Li, S. L. ^{[1
,3
]}

Deng, X. X. ^{[1
,3
]}

Chen, D. M. ^{[1
]}

Yang, K. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China

[2] China Inst Atom Energy, Beijing 102413, Peoples R China

[3] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2008年 / 453卷 / 1-2期

关键词：

hydrogen storage alloy; metal hydride; gas-solid reactions; hydrogenation cycling;

D O I：

10.1016/j.jallcom.2006.11.112

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effect of hydrogen absorption/desorption cycling on the hydrogen storage properties of LaNi4.25Al0.75 was investigated. The pressure-composition (PC) isotherms for absorption/desorption and absorption kinetics were measured at 363, 383 and 403 K, 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 (0.36-103 mu m) compared to that after initial activation (0.78-301 mu m), with volume mean diameter decreasing from 34.81 to 11.34 mu m. The change of hydrogen absorption/desorption properties of LaNi4.25Al0.75 over 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. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：448 / 452

页数：5

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