Mg-based composites for enhanced hydrogen storage performance |
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| Affiliation: | 1. School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi''an 710021, China;2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an 710072, China;1. State Key Laboratory of Silicon Materials, School of Materials Science & Engineering, Zhejiang University, Hangzhou, 310027, China;2. Guangxi Colleges and Universities Key Laboratory of Novel Energy Materials and Related Technology, Guangxi Novel Battery Materials Research Center of Engineering Technology, School of Physical Science and Technology, Guangxi University, Nanning, 530004, PR China;1. Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, Shanxi, PR China;2. Key Laboratory of Advanced Energy Materials Chemistry (MOE), Nankai University, Tianjin 300071, PR China;3. The Co-Innovation Center of Chemistry and Chemical Engineering of Tianjin, Tianjin 300071, PR China;1. Department of Materials Physics, Eötvös University, P.O.B. 32, H-1518, Budapest, Hungary;2. Department of Chemistry, University of Sofia “St.Kl.Ohridski”, 1164, Sofia, Bulgaria;3. Center of Energy Research, Hungarian Academy of Sciences, H-1121, Budapest, Hungary;4. Physics of Nanostructured Materials, Faculty of Physics, University of Vienna, A-1090, Vienna, Austria;1. School of Materials Science and Engineering, South China University of Technology, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, Guangzhou 510641, People''s Republic of China;2. School of Marine Engineering, Jimei University, Xiamen 361021, People''s Republic of China;3. Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering (IAPME), University of Macau, Macau SAR, People''s Republic of China |
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| Abstract: | Hydrogen storage in solids of hydrides is advantageous in comparison to gaseous or liquid storage. Magnesium based materials are being studies for solid-state hydrogen storage due to their advantages of high volumetric and gravimetric hydrogen storage capacity. However, unfavorable thermodynamic and kinetic barriers hinder its practical application. In this work, we presented that kinetics of Mg-based composites were significantly improved during high energy ball milling in presence of various types of carbon, including plasma carbon produced by plasma-reforming of hydrocarbons, activated carbon, and carbon nanotubes. The improvement of the kinetics and de-/re-hydrogenation performance of MgH2 and TiC-catalysed MgH2 by introduction of carbon are strongly dependent on the milling time, amount of carbon and carbon structure. The lowest dehydrogenation temperature was observed at 180 °C by the plasma carbon–modified MgH2/TiC. We found that nanoconfinement of carbon structures stabilised Mg-based nanocomposites and hinders the nanoparticles growth and agglomeration. Plasma carbon was found to show better effects than the other two carbon structures because the plasma carbon contained both few layer graphene sheets that served as an active dispersion matrix and amorphous activated carbons that promoted the spill-over effect of TiC catalysed MgH2. The strategy in enhancing the kinetics and thermodynamics of Mg-based composites is leading to a better design of metal hydride composites for hydrogen storage. |
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| Keywords: | Mg-based composites Hydrogen storage Carbon |
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