Oxygen vacancy in magnesium/cerium composite from ball milling for hydrogen storage improvement |
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| Affiliation: | 1. College of Chemical and Environmental Engineering, State Key Laboratory of Mining Disaster Prevention and Control Co-funded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China;2. College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang, 471934, China;1. Fujian Provincial Key Laboratory of Functional Materials and Applications, Xiamen University of Technology, Xiamen, 361024, China;2. School of Materials Science and Engineering, Xiamen University of Technology, Xiamen, 361024, China;3. Institute of Advanced Wear & Corrosion Resistance and Functional Materials, Jinan University, Guangzhou, 510632, China;1. College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China;2. College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao 266590, China;3. Union Research Center of Fuel Cell, School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China;1. International Joint Research Center of Low-Carbon Green Process Equipment, China;2. Tianjin Key Lab of Integrated Design and On-line Monitoring for Light Industry & Food Machinery and Equipment, Tianjin, China;3. College of Mechanical Engineering, Tianjin University of Science & Technology, No. 1038 Dagu Nanlu, Hexi District, Tianjin 300222, China;4. Department of Physics, Tokyo University of Science, No. 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan;5. College of Electronic Information and Automation, Tianjin University of Science and Technology, China;6. Graduate School of Science and Engineering, Chiba University, 1-33, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan;7. Herbert Gleiter Institute of Nanoscience, Nanjing University of Science & Technology, No. 200, Xiaolingwei Street, Nanjing 210094, China |
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| Abstract: | The hydrogen sorption performance of Mg is constrained by the difficulties of hydrogen dissociation on particle surface and mass transfer in particle bulk. This work focuses on oxygen vacancy and its effect on the performance of Mg-xCeO2 (x = 0.7, 1.5, 3, and 6 mol.%) from ball milling for hydrogen storage. The HRTEM observation shows that the crystal domains of Mg from ball milling are reduced to nanoscale by the addition of hard CeO2 nanoparticles. The XRD and XPS characterization shows that during heating for hydrogenation, some O atoms in CeO2 transfer to Mg and form MgO, and CeO2 converts to Ce6O11 with oxygen vacancies. The isothermal absorption (p-c-T) analysis shows that the hydrogen capacity of the materials increases with the increase of CeO2 additive, and the optimum addition is 3.0 mol.%. The DSC analysis shows that with the addition of 3.0 mol.% of CeO2, the hydrogen desorption peak temperature is 35 °C lower than that of pure MgH2, and the calculated activation energy deceases by 31.3 kJ/mol. The improvement of hydrogen sorption performance is mainly attributed to the formation of oxygen vacancies. |
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| Keywords: | Hydrogen storage Ball milling Magnesium Oxygen vacancy |
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