Hydrogen storage properties on mechanically milled graphite

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	Hydrogen storage properties on mechanically milled graphite
	T. Ichikawa; D. M. Chen; S. Isobe; E. Gomibuchi; H. Fujii
	2004
发表期刊	Materials Science and Engineering B-Solid State Materials for Advanced Technology
ISSN	0921-5107
卷号	108 期号:1-2 页码:138-142
摘要	We investigated hydrogen absorption/desorption and structural properties in mechanically milled graphite under hydrogen pressures up to 6 MPa to clarify catalytic and hydrogen pressure effects in the milling. The results indicate that a small amount of iron contamination during milling plays a quite important role as a catalyst for hydrogen absorption/desorption properties in graphite. Two-peak structure for hydrogen desorption in the TDS profile is due to existence of two different occupation sites for hydrogen, which is caused by the existence of high dispersing iron on graphite. From the experiment of high pressure milling, we clarified that the number of defects in graphite decreases with increasing the atmospheric hydrogen pressure during milling, leading to the decrease in the absorbed hydrogen content and the stabilization of hydrogen on the occupation sites. In addition, we confirmed the existence of physisorption-like reversible hydrogen at room temperature in the graphite prepared by milling under high pressure hydrogen atmosphere above 3 MPa. This unstable hydrogen might strongly be correlated with the existence of the lamella structure in nanometer scale, which only leaves in graphite prepared by high pressure milling. (C) 2003 Elsevier B.V. All rights reserved.
部门归属	hiroshima univ, natl sci ctr basic res & dev, higashihiroshima 7398526, japan. chinese acad sci, inst met res, shenyang 110015, peoples r china. hiroshima univ, grad sch adv sci matter, higashihiroshima 7398530, japan.;ichikawa, t (reprint author), 1-7-1 kagamiyama, higashihiroshima 7398521, japan;tichi@hiroshima-u.ac.jp
关键词	Hydrogen Graphite Catalysis Chemisorption Iron Carbides Prepared Nanostructured Graphite
URL	查看原文
WOS记录号	WOS:000220947700026
引用统计	被引频次：47[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/321006/35384
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	T. Ichikawa,D. M. Chen,S. Isobe,et al. Hydrogen storage properties on mechanically milled graphite[J]. Materials Science and Engineering B-Solid State Materials for Advanced Technology,2004,108(1-2):138-142.
APA	T. Ichikawa,D. M. Chen,S. Isobe,E. Gomibuchi,&H. Fujii.(2004).Hydrogen storage properties on mechanically milled graphite.Materials Science and Engineering B-Solid State Materials for Advanced Technology,108(1-2),138-142.
MLA	T. Ichikawa,et al."Hydrogen storage properties on mechanically milled graphite".Materials Science and Engineering B-Solid State Materials for Advanced Technology 108.1-2(2004):138-142.