Journal
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
Volume -, Issue -, Pages -Publisher
SPRINGER
DOI: 10.1007/s11665-022-07661-z
Keywords
crystal cell parameter; hydrogen desorption temperature; hydrogen storage; MgH2; relationship
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Funding
- Natural Science Foundation of Shandong Province, China
- National Natural Science Foundation of China
- National Key Technologies Research and Development Program
- [ZR2020KE035]
- [No.U1610103]
- [2021YFB4001400]
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This study reveals the relationship between the crystal structure and the hydrogen desorption activity of MgH2. The unit cell lattice constant a of beta-MgH2 is found to be the critical parameter determining the dehydrogenation temperature, with a negative correlation. Cobalt is found to have the best catalytic effect on beta-MgH2, with the lowest initial temperature of hydrogen desorption.
To reveal the relationship between the crystal structure and the hydrogen desorption activity of MgH2, magnesium-based materials doped with anthracite, molybdenum disulfide, and cobalt were prepared by mechanical ball milling. The relationship between the cell parameters of beta-MgH2 and the corresponding dehydrogenation peak temperature was investigated by x-ray diffraction and temperature-programmed desorption. The results show that the unit cell lattice constant a of beta-MgH2 is the most critical parameter to determine the dehydrogenation temperature with a negative correlation. With identical material composition, a larger a value leads to a lower dehydrogenation temperature of beta-MgH2. The catalytic effect of the three substances on beta-MgH2 hydrogen desorption is in the order of Co > anthracite > MoS2. The initial temperature of beta-MgH2 hydrogen desorption by cobalt doping is as low as 175 C.
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