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Preparation and hydrogen sorption properties of Mg-Cu-Y-H systems

Rare Metals 2006年第z2期25卷 89-94页

作者： LI Zhinian LIU Xiaopeng HUANG Zuo JIANG Lijun WANG Shumao Energy Materials and Technology Research Institute General Research Institute for Nonferrous MetalsBeijing 100088China

Mg-xwt.%CuY(x=15,20,25)composites were successfully prepared by reactive mechanical alloying(RMA).X-ray diffraction(XRD)measurement shows that main phases of the as milled composites are MgH_(2) and Mg_(2)Cu,and they converted into Mg and MgCu_(2) after dehydrogenation,***-Composition-Isotherm(PCI)test shows that the composites exhibit double pressure plateau at each isothermal desorption *** hydrogen absorption and desorption kinetics of the composites become worse with increasing x content,indicating that Mg-Cu phase has a negative effect on the hydrogen sorption properties of the *** is supposed that the good hydrogen sorption properties of the composites attribute to the catalyst effect of yttrium hydride distributed in Mg substrate and the particles size reduction and crystal defects formed by RMA.

关键词： hydrogen storage composite mechanical alloying Mg-Cu-Y-H system magnesium

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hydrogen sorption properties of Mg-20wt.%Fe_(23)Y_(8) composite prepared by reactive mechanical alloying

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Rare Metals 2006年第z1期25卷 247-251页

作者： LI Zhinian LIU Xiaopeng HUANG Zuo JIANG Lijun WANG Shumao hydrogen Material&Technology Research Institute General Research Institute for Nonferrous MetalBeijing100088China

Mg-20wt.%Fe_(23)Y_(8) composite was successfully prepared by reactive mechanical alloying(RMA).X-ray diffraction(XRD)measurement shows that the main phases of composite are MgH_(2) and *** composite exhibits excellent hydrogen abs/desorption properties and can absorb 4.36wt.%and 5.72wt.%hydrogen at 473 and 573 K in 10 min under 3.0 MPa hydrogen pressure,*** composite can desorb 5.27wt.%hydrogen at 573 K in 30 min under 0.02 MPa hydrogen *** with the pure MgH_(2),the hydrogen desorption temperature of Mg-20wt.%Fe_(23)Y_(8) composite is decreased about 40℃.It is supposed that both the catalyst effect of Fe-Y distributed in Mg substrate and the crystal defects play the main role in improving hydrogen sorption properties of Mg-20wt.%Fe_(23)Y_(8) composite.

关键词： hydrogen storage composite magnesium mechanical alloying P-C-T and Mg_(2)FeH_(6)

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hydrogenation/Dehydrogenation Performances of the MgH_2-WS_2 composites

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Journal of Wuhan University of Technology(Materials Science) 2015年第4期30卷 670-673页

作者：王家盛 ZHANG Wei CHENG Ying KE Dandan 韩树民 College of Environmental and Chemical Engineering Yanshan University State Key Laboratory of Metastable Materials Science and Technology Yanshan University

The hydrogenation/dehydrogenation kinetics and thermodynamic behaviors of the MgH2- WS2 composites were investigated. The TPD （Temperature-Programmed-Desorption） curves showed that the onset dehydrogenation temperature of the MgH2 ＋ 20wt% WS2 composite was 615 K, 58 K lower than that of the pristine MgH2. The kinetic measurements showed that within 21 rain, the MgH2 ＋ 20wt% WS2 composite could absorb 2.818wt% at 423 K, and release 4.244 wt% of hydrogen at 623 K, while the hydriding/ dehydriding capacity of MgH2 reached only 0.979wt% and 2.319wt% respectively under identical conditions. The improvement of hydrogenation/dehydrogenation performances for the composite was attributed to the co- catalytic effect between the new phases W and MgS which formed durin~ the ball-milliw, ~rocess.

关键词： MgH2 WS2 hydrogen storage composite co-catalytic

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