Investigation of the hydriding kinetic mechanism in the MgH2/Cr2O3-nanocomposite

被引：21

作者：

Li, Q

Xu, KD

Chou, KC

Lin, Q

Zhang, JY

Lu, XG

机构：

[1] Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200072, Peoples R China

[2] Univ Sci & Technol Beijing, Dept Phys Chem, Beijing 100083, Peoples R China

来源：

INTERMETALLICS | 2005年 / 13卷 / 11期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

composites; hydrogen storage; diffusion;

D O I：

10.1016/j.intermet.2005.03.006

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A kinetic analysis was done in the nano-MgH2 and MgH2/MexOy-nanocomposite (MexOy = V2O5, Cr2O3 and Fe3O4) using a new kinetic model proposed recently in our group. The summarized data of hydriding rate are very well fitted using the new model, and it indicates that the rate-controlling step is the hydrogen diffusion through the hydride phase. Compared with the characteristic absorption time of these nano-MgH2 and MgH2/MexOy-nanocomposite, the difference in the kinetic property was investigated in an explicit analytic form and the order of reaction rate and the optimal amount of oxide catalyst Cr2O3 can be determined exactly. These facts support that our model is reasonable in the nano-MgH2 and MgH2/MexOy-nanocomposite system. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：1190 / 1194

页数：5

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