The identification of a hitherto unknown intermediate phase CaB2Hx from decomposition of Ca(BH4)2

被引:51
作者
Riktor, M. D. [1 ]
Sorby, M. H. [1 ]
Chlopek, K. [2 ]
Fichtner, M. [2 ]
Hauback, B. C. [1 ]
机构
[1] Inst Energy Technol, Dept Phys, NO-2027 Kjeller, Norway
[2] Forschungszentrum Karlsruhe, Inst Nanotechnol, D-76021 Karlsruhe, Germany
关键词
INITIO STRUCTURE DETERMINATION; REVERSIBLE HYDROGEN STORAGE; THERMAL-DECOMPOSITION; CALCIUM BOROHYDRIDE; DIFFRACTION; MG(BH4)(2); METABORATE; HYDRIDES;
D O I
10.1039/b818127f
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
Ca(BH4)(2) is a promising material for hydrogen storage due to its high gravimetric capacity and expected suitable thermodynamic properties. Experimental reports indicate a more complex reaction pathway than the previously proposed route, including formation of unknown intermediate phases. In this work, the reaction scheme of a mixture of gamma- and beta-Ca(BH4)(2) was investigated using temperature programmed desorption and high-resolution synchrotron radiation powder X-ray diffraction. An unknown intermediate Ca-B-H-containing phase has been identified as a CaB2Hx compound where x most probably equals 2. A structure model is proposed.
引用
收藏
页码:2754 / 2759
页数:6
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