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Crystallite growth characteristics of Mg during hydrogen desorption of MgH2

Progress in Natural Science:Materials International 2020年第2期30卷 246-250页

作者： Caiqin Zhou Chaodong Hu Yongtao Li Qingan Zhang School of Materials Science and Engineering Anhui University of Technology

MgH2is one of promising hydrogen storage materials,but Mg crystallites grow up very fast during hydrogen desorption,leading to the degradation of hydrogen storage *** the growth behavior and mechanism of Mg crystallites during hydrogen desorption of nanocrystalline MgH2were investigated in this *** was found that the transformation from MgH2to Mg occurred by the surface-controlled‘nucleation and growth' *** the instantaneous nucleation of Mg at free surfaces of MgH2particles,Mg crystallites grew through three stages,namely one-dimensional,then two-dimensional and finally one-dimensional *** the second stage,Mg crystallites grew quickly as compared with other *** complete hydrogen desorption,the average Mg crystallite size in MgH2-10 wt% Pr3Al11sample was smaller than that in pure MgH2sample due to the presence of Pr3Al11.

关键词： Magnesium hydride Crystallite growth hydrogen desorption

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Understanding the dehydrogenation properties of Mg(0001)/MgH_(2)(110)interface from first principles

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Materials Reports(Energy) 2024年第1期4卷 89-94页

作者： Jianchuan Wang Bo Han Zhiquan Zeng Shiyi Wen Fen Xu Yong Du State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083PR China Powder Metallurgy Research Institute Central South UniversityChangsha410083PR China Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin541004PR China

Magnesium hydride is one of the most promising solid-state hydrogen storage materials for on-board *** desorption from MgH_(2) is accompanied by the formation of the Mg/MgH_(2) interfaces,which may play a key role in the further dehydrogenation *** this work,first-principles calculations have been used to understand the dehydrogenation properties of the Mg(0001)/MgH_(2)(110) *** is found that the Mg(0001)/MgH_(2)(110) interface can weaken the Mg-H *** removal energies for hydrogen atoms in the interface zone are significantly lower compared to those of bulk MgH_(2).In terms of H mobility,hydrogen diffusion within the interface as well as into the Mg matrix is *** calculated energy barriers reveal that the migration of hydrogen atoms in the interface zone is easier than that in the bulk MgH_(2).Based on the hydrogen removal energies and diffusion barriers,we conclude that the formation of the Mg(0001)/MgH_(2)(110) interface facilitates the dehydrogenation process of magnesium hydride.

关键词： Magnesium hydrides First-principles calculation hydrogen storage materials Interface hydrogen desorption

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hydrogen absorption of NdDyFeCoNbCuB sintered magnets

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Journal of Rare Earths 2009年第3期27卷 520-524页

作者：罗建军 De Rango P Fruchart D 梅金娜胡锐李金山周廉 State Key Laboratory of Solidification Processing Northwestern Polytechnic University Matière Condensée Matériaux et Fonctions (MCMF) Institut NéelCNRSBP 16638042 Grenoble Cedex 9France Matière Condensée Matériaux et Fonctions(MCMF) Institut NéelCNRSBP 16638042 Grenoble Cedex 9France Consortium de Recherches Pour l'Emergence de Technologies Avancées(CRETA) CNRSBP 16638042 Grenoble Cedex 9France

hydrogen absorption and desorption characteristics for high coercivity NdDyFeCoNbCuB sintered bulk magnets were studied, by differential scanning calorimetry （DSC） measurement and hydrogenation kinetics measurement. The DSC measurements showed that hydrogenation of Nd-rich phase occurred in the temperature range of 40-185 ℃, hydrogenation of the tetragonal （Ф） phase in the temperature range of 185-220 ℃, as well as the disproportionation of the Ф phase that occurred in a broad temperature range from around 500 to 800 ℃. The hydrogenation kinetics measurements indicated that hydrogen absorption of the bulk magnets at 50 ℃ absorbed more hydrogen than at 150 ℃, although this procedure was slower at 50 ℃ than at 150℃. This phenomenon was discussed by means of pressure-concentration-temperature （p-c-T） diagrams.

关键词： hydrogen absorption hydrogen desorption sintered NdDyFeCoNbCuB magnets rare earths

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