Hydrogen Storage Properties of Magnesium Hydride with V-Based Additives
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- 作者：Chai Ren ; Z. Zak Fang ; Chengshang Zhou ; Jun Lu ; Yang Ren ; Xiaoyi Zhang
- 刊名：Journal of Physical Chemistry C
- 出版年：2014
- 出版时间：September 25, 2014
- 年：2014
- 卷：118
- 期：38
- 页码：21778-21784
- 全文大小：326K
- ISSN：1932-7455
文摘
Magnesium hydride is one of the most promising candidates for solid-state hydrogen storage and thermal energy storage applications. The effects of V-based solid solution alloys on the hydrogenation and dehydrogenation behavior of magnesium hydride are studied. Significant reduction of the dehydrogenation temperature and improvements of the kinetics of both absorption and desorption reactions were observed for MgH2 with V-based additives. Those observations were made using thermogravimetric analysis (TGA) and pressure鈥揷omposition鈥搕emperature (PCT) techniques. In situ synchrotron X-ray diffraction (XRD) measurements suggest that the additives functioned as catalysts during the reactions. The comparison of the characteristics of different additives suggested that the hydrogen equilibrium pressures of those additives themselves have a significant bearing on their effects on the kinetic behaviors of MgH2. The lower is the stability of an additive as a hydride, the more effective it would be as a catalyst.