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

Hjalte Sylvest Jacobsen; Heine Anton Hansen; Jens Wenzel Andreasen; Qing Shi; Anders Andreasen; Robert Feidenhans'l; Martin Meedom Nielsen; Kenny Ståhl; Tejs Vegge

doi:10.1016/j.cplett.2007.05.001

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

Hjalte Sylvest Jacobsen, Heine Anton Hansen, Jens Wenzel Andreasen, Qing Shi, Anders Andreasen, Robert Feidenhans'l, Martin Meedom Nielsen, Kenny Ståhl, Tejs Vegge

University of Copenhagen

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

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.

Original language	English
Journal	Chemical Physics Letters
Volume	441
Issue number	4-6
Pages (from-to)	255-260
ISSN	0009-2614
DOIs	https://doi.org/10.1016/j.cplett.2007.05.001
Publication status	Published - 2007

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@article{299c020810f9477bbc712574d4788ae4,

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

abstract = "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.",

author = "Jacobsen, {Hjalte Sylvest} and Hansen, {Heine Anton} and Andreasen, {Jens Wenzel} and Qing Shi and Anders Andreasen and Robert Feidenhans'l and Nielsen, {Martin Meedom} and Kenny St{\aa}hl and Tejs Vegge",

year = "2007",

doi = "10.1016/j.cplett.2007.05.001",

language = "English",

volume = "441",

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journal = "Chemical Physics Letters",

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TY - JOUR

T1 - Nanoscale structural characterization of Mg(NH3)6Cl2 during NH3 desorption

T2 - An in situ small angle X-ray scattering study

AU - Jacobsen, Hjalte Sylvest

AU - Hansen, Heine Anton

AU - Andreasen, Jens Wenzel

AU - Shi, Qing

AU - Andreasen, Anders

AU - Feidenhans'l, Robert

AU - Nielsen, Martin Meedom

AU - Ståhl, Kenny

AU - Vegge, Tejs

PY - 2007

Y1 - 2007

N2 - 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.

AB - 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.

U2 - 10.1016/j.cplett.2007.05.001

DO - 10.1016/j.cplett.2007.05.001

M3 - Journal article

SN - 0009-2614

VL - 441

SP - 255

EP - 260

JO - Chemical Physics Letters

JF - Chemical Physics Letters

IS - 4-6

ER -