Crystal Structure and Hydrogen Storage Behaviors of Mg/MoS2 Composites from Ball Milling

The Mg/MoS2 composites were prepared by ball milling under argon atmosphere,and the effect of MoS2 on the crystal structure and hydrogen storage properties of Mg was investigated.It is found that 10 wt% of MoS2 is sufficient to prevent particle aggregation and cold welding during the milling process...

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Published inJournal of Wuhan University of Technology. Materials science edition Vol. 31; no. 4; pp. 773 - 778
Main Authors Han, Zongying, Zhou, Shixue, Wang, Naifei, Zhang, Qianqian, Zhang, Tonghuan, Ran, Weixian
Format Journal Article
LanguageEnglish
Published Wuhan Wuhan University of Technology 01.08.2016
Subjects
Advanced Materials
Avrami模型
Chemistry and Materials Science
Materials Science
MgH2
二硫化钼
储氢性能
复合材料
晶体结构
晶粒尺寸
脱氢工艺
crystal structure
molybdenum disulfide
decomposition kinetics
dehydrogenation temperature
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Summary:The Mg/MoS2 composites were prepared by ball milling under argon atmosphere,and the effect of MoS2 on the crystal structure and hydrogen storage properties of Mg was investigated.It is found that 10 wt% of MoS2 is sufficient to prevent particle aggregation and cold welding during the milling process.The crystallite size of Mg will remain constant at slightly less than 38.8 nm with the milling process due to the size confinement effect of MoS2.The dehydrogenation temperature of MgH2 is reduced to 390.4-429.4 ℃ due to the crystallite size reduction.Through fitting by Johnson-Mehl-Avrami model,it is found that Mg crystal grows by three dimension controlled by interface transformation during the process of MgH2 decomposition.MoS2 has a weak catalyst effect on the decomposition of MgH2 and activation energy of 148.9 k J/mol is needed for the dehydrogenation process calculated by the Arrhenius equation.
Bibliography:crystallite milling confinement aggregation fitting argon agglomeration magnesium subsequent hydrogenation
42-1680/TB
The Mg/MoS2 composites were prepared by ball milling under argon atmosphere,and the effect of MoS2 on the crystal structure and hydrogen storage properties of Mg was investigated.It is found that 10 wt% of MoS2 is sufficient to prevent particle aggregation and cold welding during the milling process.The crystallite size of Mg will remain constant at slightly less than 38.8 nm with the milling process due to the size confinement effect of MoS2.The dehydrogenation temperature of MgH2 is reduced to 390.4-429.4 ℃ due to the crystallite size reduction.Through fitting by Johnson-Mehl-Avrami model,it is found that Mg crystal grows by three dimension controlled by interface transformation during the process of MgH2 decomposition.MoS2 has a weak catalyst effect on the decomposition of MgH2 and activation energy of 148.9 k J/mol is needed for the dehydrogenation process calculated by the Arrhenius equation.
ISSN:1000-2413
1993-0437
DOI:10.1007/s11595-016-1444-2