Extraordinary catalytic effect of Laves phase Cr and Mn alloys on hydrogen dissociation and absorption

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	Extraordinary catalytic effect of Laves phase Cr and Mn alloys on hydrogen dissociation and absorption
	E. D. Wu; W. H. Li; J. Li
	2012
发表期刊	International Journal of Hydrogen Energy
ISSN	0360-3199
卷号	37 期号:2 页码:1509-1517
摘要	In activation of hydrogen storage alloys, the nickel-group metals, especially Pd, act as the catalysts to dissociate hydrogen and turn the alloys into successful hydrogen absorbers. The Laves phase Sc and Zr alloys with Cr Mn as common components exhibit extraordinary hydrogen activation properties matching Pd. Through a cracking mechanism, the bulk samples of these alloys rapidly absorb hydrogen at sub-atmospheric pressures and room-temperature, achieve absorption performance of those Pd surface-modified alloys, meanwhile retaining good reversibility. Among them, the ScCrMn exhibits significantly higher absorption rate than Pd, whereas, the ZrCrMn shows similar absorption kinetics and reversibility to Pd. The shortest initial-activation-time, highest initial-activation-rate and lowest allowed-activation-pressure achieved by ScCrMn are 15 s, -16.6 kPa/s and 0.46 kPa, respectively, in comparison with those of 18 s, 3.2 kPa/s and 0.13 kPa for Pd powder measured under equivalent conditions. The findings and associated magnetization measurements indicate that Cr and Mn upon alloying with certain lower valence metals possess surface electronic structures highly beneficial to hydrogen dissociation. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
部门归属	[wu, erdong; li, wuhui] chinese acad sci, shenyang natl lab mat sci, shenyang 110016, peoples r china. [li, jing] chinese acad sci, shenyang r&d ctr adv mat, inst met res, shenyang 110016, peoples r china.;wu, ed (reprint author), chinese acad sci, shenyang natl lab mat sci, shenyang 110016, peoples r china.;ewu@imr.ac.cn
关键词	Cr And Mn Alloy Catalysts Hydrogen Dissociation Hydrogen Storage Materials HydrogenAtion At Ambient Pressure And temperAture Desorption-kinetics Storage Alloys Adsorption Surface Chemisorption Hydride Energy Carbon
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60340
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	E. D. Wu,W. H. Li,J. Li. Extraordinary catalytic effect of Laves phase Cr and Mn alloys on hydrogen dissociation and absorption[J]. International Journal of Hydrogen Energy,2012,37(2):1509-1517.
APA	E. D. Wu,W. H. Li,&J. Li.(2012).Extraordinary catalytic effect of Laves phase Cr and Mn alloys on hydrogen dissociation and absorption.International Journal of Hydrogen Energy,37(2),1509-1517.
MLA	E. D. Wu,et al."Extraordinary catalytic effect of Laves phase Cr and Mn alloys on hydrogen dissociation and absorption".International Journal of Hydrogen Energy 37.2(2012):1509-1517.