Catalytic effect of 3d transition metals on hydrogen storage properties in mechanically milled graphite

被引:41
作者
Isobe, S
Ichikawa, T
Gottwald, JI
Gomibuchi, E
Fujii, H [1 ]
机构
[1] Hiroshima Univ, Nat Sci Ctr Basic Res & Dev, Higashihiroshima 7398530, Japan
[2] Hiroshima Univ, Grad Sch Adv Sci Matter, Higashihiroshima 7398530, Japan
[3] BMW Technol & Res, D-80788 Munich, Germany
关键词
D O I
10.1016/j.jpcs.2003.08.039
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In this paper, we examined the catalytic effect of 3d transition metals on hydrogen storage properties in nanostructural graphite prepared by ball milling under hydrogen atmosphere. The Fe-doped nanostructured graphite shows the most marked hydrogen storage properties among the Fe-, Co-, Ni- and Cu-catalyzed graphite systems. The absorbed hydrogen concentration reaches up to similar to4 wt% by mechanically milling for 32 h (similar to7 wt% for 80 h), and two peaks of hydrogen (mass number = 2) around 730 and 1050 K were observed in the thermal desorption mass spectra (TDS). The starting temperature for hydrogen desorption was similar to600 K. On the other hand, the Co-doped graphite indicates that absorbed hydrogen concentrations reaches up to similar to2 wt% by mechanically milling for 32 h. The TDS spectrum showed only a broad peak around 1100 K, but the starting point for hydrogen desorption lowered down to similar to500 K. The Ni- and Cu-doped graphites did not show any significant improvement for hydrogen storage. These results suggest that the catalytic effect on hydrogen storage properties strongly depends on the affinity of graphite and doped metals. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码:535 / 539
页数:5
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