Microscopic Study on Hydrogenation Mechanism of MgH2 Catalyzed by Nb2O5

被引：8

作者：

Isobe, Shigehito ^{[1
,2
]}

Umeda, Ayaka ^{[1
]}

Wakasugi, Takenobu ^{[1
]}

Ma, Tao ^{[1
]}

Yamagami, Ryo ^{[1
]}

Hino, Satoshi ^{[1
]}

Wang, Yongming ^{[1
,2
]}

Hashimoto, Naoyuki ^{[1
]}

Ohnuki, Somei ^{[1
]}

机构：

[1] Hokkaido Univ, Grad Sch Engn, Sapporo, Hokkaido 0608278, Japan

[2] Hokkaido Univ, Creat Res Inst, Sapporo, Hokkaido 0010021, Japan

来源：

MATERIALS TRANSACTIONS | 2014年 / 55卷 / 08期

关键词：

hydrogen storage materials; magnesium hydride; transmission electron microscopy; SORPTION KINETICS; MAGNESIUM;

D O I：

10.2320/matertrans.MG201417

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We propose the microstructural change model of magnesium hydride catalyzed by Nb2O5 during hydrogenation. The ball-milled composites, MgH2 and 1 mol% Nb2O5, were dehydrogenated and then rehydrogenated for varied time at room temperature under 0.1 MPa H-2 atmosphere. The crystallite size of Mg and MgH2 was evaluated by powder X-ray diffraction (XRD) measurement and confirmed by transmission electron microscopy (TEM) observation. The crystallite size of generated MgH2 was smaller than that of Mg and did not change significantly with increasing time of hydrogenation. It is suggested that the number density of MgH2 crystallites increases during the hydrogenation process.

引用

页码：1175 / 1178

页数：4

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