Crystallite growth characteristics of Mg during hydrogen desorption of MgH2
Autor: | Yongtao Li, Qingan Zhang, Caiqin Zhou, Chaodong Hu |
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Jazyk: | angličtina |
Rok vydání: | 2020 |
Předmět: |
Materials science
Magnesium hydride Nucleation 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Hydrogen desorption Crystallite growth 01 natural sciences Nanocrystalline material 0104 chemical sciences Hydrogen storage Chemical engineering lcsh:TA401-492 Degradation (geology) General Materials Science lcsh:Materials of engineering and construction. Mechanics of materials Crystallite 0210 nano-technology |
Zdroj: | Progress in Natural Science: Materials International, Vol 30, Iss 2, Pp 246-250 (2020) |
ISSN: | 1002-0071 |
Popis: | MgH2 is one of promising hydrogen storage materials, but Mg crystallites grow up very fast during hydrogen desorption, leading to the degradation of hydrogen storage properties. Therefore the growth behavior and mechanism of Mg crystallites during hydrogen desorption of nanocrystalline MgH2 were investigated in this work. It was found that the transformation from MgH2 to Mg occurred by the surface-controlled ‘nucleation and growth’ mechanism. After the instantaneous nucleation of Mg at free surfaces of MgH2 particles, Mg crystallites grew through three stages, namely one-dimensional, then two-dimensional and finally one-dimensional growths. In the second stage, Mg crystallites grew quickly as compared with other stages. After complete hydrogen desorption, the average Mg crystallite size in MgH2−10 wt% Pr3Al11 sample was smaller than that in pure MgH2 sample due to the presence of Pr3Al11. |
Databáze: | OpenAIRE |
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