The effect of Sr(OH)(2) on the hydrogen storage properties of the Mg(NH2)(2)-2LiH system

doi:10.1039/c7cp00748e

	The effect of Sr(OH)(2) on the hydrogen storage properties of the Mg(NH2)(2)-2LiH system
	Dornheim, Martin 1; Cao, Hujun 1; Wang, Han 2; Pistidda, Claudio 1; Milanese, Chiara 3; Zhang, Weijin 2; Chaudhary, Anna-Lisa 1; Santoru, Antonio ; Garroni, Sebastiano 4; Bednarcik, Jozef 5
刊名	PHYSICAL CHEMISTRY CHEMICAL PHYSICS
	2017-03-28
卷号	19 期号:12 页码:8457-8464
ISSN号	1463-9076
DOI	10.1039/c7cp00748e
文献子类	Article
英文摘要	The doping effect of Sr(OH)(2) on the Mg(NH2)(2)-2LiH system is investigated considering different amounts of added Sr(OH)(2) in the range of 0.05 to 0.2 mol. Experimental results show that both the thermodynamic and the kinetic properties of Mg(NH2)(2)-2LiH are influenced by the presence of Sr(OH)(2). The addition of 0.1 mol Sr(OH)(2) leads to a decrease in both the dehydrogenation onset and peak temperatures of ca. 70 and 13 degrees C, respectively, and an acceleration in the de/re-hydrogenation rates of one time at 150 degrees C compared to Mg(NH2)(2)-2LiH alone. Based on differential scanning calorimetry (DSC) analysis, the overall reaction enthalpy of the 0.1 Sr(OH)(2)-doped sample is calculated to be 44 kJ per mol-H-2 and there are two absorption events occurring in the doped sample instead of one in the pristine sample. For the applied experimental conditions, according to the in situ synchrotron radiation powder X-ray diffraction (SR-PXD) and Fourier Transform Infrared spectroscopy (FT-IR) analysis, the reaction mechanism has been finally defined: Sr(OH)(2), Mg(NH2)(2) and LiH react with each other to form SrO, MgO and LiNH2 during ball milling. After heating, SrO interacts with Mg(NH2)(2) producing MgO and Sr(NH2)(2). Then Mg(NH2)(2), LiNH2 and Sr(NH2)(2) react with LiH to produce Li2NH, SrNH, Li2Mg(NH)(2) and Li2Mg2(NH)(3) in traces. After re-hydrogenation, LiSrH3, LiH and LiNH2 are formed along with amorphous Mg(NH2)(2). The reasons for the improved kinetics are: (a) during dehydrogenation, the in situ formation of SrNH appears to increase the interfacial contacts between Mg(NH2)(2) and LiH and also weakens the N-H bond of Mg(NH2)(2); (b) during absorption, the formation of LiSrH3 at around 150 degrees C could be the key factor for improving the hydrogenation properties.
WOS关键词	N-H SYSTEM ; TEXTURE ANALYSIS ; REACTION PATHWAY ; MG ; LI ; HYDRIDE ; IMPROVEMENT ; DIFFRACTION ; DESORPTION ; COMPOSITE
WOS研究方向	Chemistry ; Physics
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000397860900037
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/169464]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
通讯作者	Cao, Hujun
作者单位	1.Helmholtz Zentrum Geesthacht, Inst Mat Res, Mat Technol, Max Planck Str 1, D-21502 Geesthacht, Germany 2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China 3.Univ Pavia, Chem Phys Sect, Dept Chem, Pavia Lab H2, Viale Taramelli 16, I-27100 Pavia, Italy 4.INSTM, Dept Chem & Pharm, Via Vienna 2, I-07100 Sassari, Italy 5.DESY, Notkestr 85, Hamburg, Germany
推荐引用方式 GB/T 7714	Dornheim, Martin,Cao, Hujun,Wang, Han,et al. The effect of Sr(OH)(2) on the hydrogen storage properties of the Mg(NH2)(2)-2LiH system[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2017,19(12):8457-8464.
APA	Dornheim, Martin.,Cao, Hujun.,Wang, Han.,Pistidda, Claudio.,Milanese, Chiara.,...&Klassen, Thomas.(2017).The effect of Sr(OH)(2) on the hydrogen storage properties of the Mg(NH2)(2)-2LiH system.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,19(12),8457-8464.
MLA	Dornheim, Martin,et al."The effect of Sr(OH)(2) on the hydrogen storage properties of the Mg(NH2)(2)-2LiH system".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 19.12(2017):8457-8464.