Improving hydrogen storage performance of NaAlH4 by novel two-step milling method

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	Improving hydrogen storage performance of NaAlH4 by novel two-step milling method
	X. D. Kang; P. Wang; H. M. Cheng
	2007
发表期刊	Journal of Physical Chemistry C
ISSN	1932-7447
卷号	111 期号:12 页码:4879-4884
摘要	A selective two-step doping method was developed to prepare metallic Ti-doped NaAlH4, in which a catalytic amount of metallic Ti was first milled with NaH and then milled again after adding Al powder (NaH:Al=1:1). As determined by the combined X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) examinations, the utilization of this novel doping method has produced a more homogeneous dispersion of the fine Ti hydride particles in the NaH/Al matrix, compared to the sample prepared by the traditional one-step milling. As a result, both the hydrogen capacity and de-/hydriding kinetics of the doped materials have been markedly improved. For the NaH + Al + 0.04Ti mixture mechanically milled for 20 h, the cycling hydrogen capacity of the two-step milled sample reached to over 4.3 wt %, about 40% higher than the sample prepared by the traditional one-step method. Moreover, it was observed that the cycling performance of the doped material was highly stable over several hydriding/dehydriding cycles. On the basis of these results, a discussion regarding the nature of catalytically active species was given.
部门归属	chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;wang, p (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china;pingwang@imr.ac.cn
关键词	Sodium Aluminum-hydride Ti-doped Naalh4 Reversible Dehydrogenation Titanium Alanate Powder Al
URL	查看原文
WOS记录号	WOS:000245084100059
引用统计	被引频次：23[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/33615
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. D. Kang,P. Wang,H. M. Cheng. Improving hydrogen storage performance of NaAlH4 by novel two-step milling method[J]. Journal of Physical Chemistry C,2007,111(12):4879-4884.
APA	X. D. Kang,P. Wang,&H. M. Cheng.(2007).Improving hydrogen storage performance of NaAlH4 by novel two-step milling method.Journal of Physical Chemistry C,111(12),4879-4884.
MLA	X. D. Kang,et al."Improving hydrogen storage performance of NaAlH4 by novel two-step milling method".Journal of Physical Chemistry C 111.12(2007):4879-4884.