On the reversibility of hydrogen storage in Ti- and Nb-catalyzed Ca(BH4)2

被引：91

作者：

Kim, Jae-Hun ^{[1
]}

Shim, Jae-Hyeok ^{[1
]}

Cho, Young Whan ^{[1
]}

机构：

[1] Korea Adv Inst Sci & Technol, Mat Sci & Technol Res Div, Seoul 136791, South Korea

来源：

JOURNAL OF POWER SOURCES | 2008年 / 181卷 / 01期

关键词：

hydrogen storage; calcium borohydride; catalyst; ball milling; thermal analysis; fuel cell;

D O I：

10.1016/j.jpowsour.2008.02.094

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：

The hydrogen sorption properties of calcium borohydricle (Ca(BH4)(2)) catalyzed with a small amount of TiF3, TiCl3, NbF5 or NbCl5 are investigated using thermal analyses and X-ray diffraction. NbF5 exhibits the best performance among all the catalysts: it causes a decrease in the hydrogen desorption temperature which leads to hydrogen absorption at practical temperature and pressure conditions. The hydrogen content of Ca(BH4)(2) with NbF5 reaches about 5.0wt.% after hydrogen absorption at 693 K for 24 h under 90 bar of hydrogen. The main dehydrogenation product of Ca(BH4)(2) with NbF5 is a CaH2-xFx solid solution with a CaF2 (Cl) structure, while pure Ca(BH4)(2) produces CaH2 after hydrogen desorption. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：140 / 143

页数：4

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