Catalytic effect on hydrogen desorption in Nb-doped microcrystalline MgH2

被引：63

作者：

Bazzanella, N ^{[1
]}

Checchetto, R ^{[1
]}

Miotello, A ^{[1
]}

机构：

[1] Univ Trent, Dipartimento Fis, I-38050 Trento, Italy

来源：

APPLIED PHYSICS LETTERS | 2004年 / 85卷 / 22期

关键词：

D O I：

10.1063/1.1829155

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Mg and Nb-doped Mg films were deposited by rf magnetron sputtering. Morphological and structural analysis were performed by scanning electron microscopy and x-ray diffraction. The desorption kinetics has been investigated by using a Sievert-type apparatus. The overall activation energy and the reaction order controlling desorption are (141+/-5) kJ mol(-1) H and napproximate to4 for Mg and (51+/-5) kJ mol(-1) H and napproximate to1 for Nb-doped (5 at. %) Mg. It is suggested that Nb atoms dispersed in the MgH2 grains catalyzes the dissociation of the hydride phase and that the rate limiting step in the H-2 desorption is given by the H atomic migration through interconnected transformed domains of h-Mg. (C) 2004 American Institute of Physics.

引用

页码：5212 / 5214

页数：3

共 16 条

[1] Study of the activation process of Mg-based hydrogen storage materials modified by graphite and other carbonaceous compounds [J].