Nanoscale structural characterization of Mg(NH3)6Cl2 during NH3 desorption:: An in situ small angle X-ray scattering study

被引：33

作者：

Jacobsen, Hjalte Sylvest

Hansen, Heine Anton

Andreasen, Jens Wenzel

Shi, Qing

Andreasen, Anders

Feidenhans'l, Robert

Nielsen, Martin Meedom

Stahl, Kenny

Vegge, Tejs ^{[1
]}

机构：

[1] Tech Univ Denmark, Riso Natl Lab, Mat Res Dept, DK-4000 Roskilde, Denmark

[2] Tech Univ Denmark, Dept Phys, Ctr Atom Scale Mat Design CAMD, DK-2800 Lyngby, Denmark

[3] Tech Univ Denmark, Riso Natl Lab, Polymer Dept, DK-4000 Roskilde, Denmark

[4] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark

[5] Univ Copenhagen, Niels Bohr Inst, Ctr Mol Movies, DK-2100 Copenhagen, Denmark

[6] Tech Univ Denmark, Dept Chem, DK-2800 Lyngby, Denmark

来源：

CHEMICAL PHYSICS LETTERS | 2007年 / 441卷 / 4-6期

关键词：

D O I：

10.1016/j.cplett.2007.05.001

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：

Complex metal hydrides progressively display improved hydrogen storage capacity, but they are still far from fulfilling the requirements of the transport sector. Recently, indirect storage of hydrogen as ammonia in Mg(NH3)(6)Cl-2 has shown impressive capacity and reversibility. Here, we present an in situ nanoscale structural characterization of the thermal decomposition of Mg(NH3)(6)Cl-2 using small angle X-ray scattering (SAXS). We observe the growth of polydisperse spherical Mg(NH3)(2)Cl-2 crystallites forming a skeletal structure, the subsequent agglomeration of MgCl2 and formation of a nanoscale porosity consisting of 25-30 nm wide channels, which may account for the exceptional fast reloading of the material. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：255 / 260

页数：6

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