Remarkably improved hydrogen storage properties of carbon layers covered nanocrystalline Mg with certain air stability |
| |
| Affiliation: | 1. School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China;2. State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;3. Magnetism Key Laboratory of Zhejiang Province, China Jiliang University, Hangzhou 310018, China;1. Current Membership: Centro Atómico Bariloche, CNEA, Av. Bustillo 9500, 8400, Bariloche, Argentina;2. Departamento de Física, Universidad Nacional de La Plata-UNLP, Argentina;3. Instituto de Física La Plata (IFLP)/Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina;4. Centro Regional Universitario Bariloche, UNCo, Quintral 1250, Bariloche, Argentina;1. School of Materials Science and Engineering and Fujian Provincial Key Laboratory of Functional Materials and Applications, Xiamen University of Technology, Xiamen 361024, China;2. School of Marine Engineering and Fujian Provincial Key Laboratory of Naval Architecture and Ocean Engineering, Jimei University, Xiamen 361021, China;3. Institute of Advanced Wear & Corrosion Resistance and Functional Materials, Jinan University, Guangzhou 510632, China;1. Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Svobodny, 79, Krasnoyarsk, 660041, Russia;2. Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, Krasnoyarsk, 660036 Russia;3. Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Akademgorodok 50/24, Krasnoyarsk, 660036 Russia;1. State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;2. Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China;3. Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, Hangzhou 310013, China;1. College of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, PR China;2. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621999, PR China;3. Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, PR China |
| |
| Abstract: | Different nanocrystalline magnesium with carbon layers were successfully synthesized via a facile wet-chemical ball milling method for 20, 30 and 40 h, respectively. Based on Scherrer formula and X-ray diffraction results, the average crystallite size of all the three samples was below 30 nm. TEM observations showed that the hydrogenated Mg particles were covered with carbon layers. Moreover, the 40 h ball milled Mg sample showed outstanding hydrogen storage performance especially in the aspect of hydrogen absorption. The as-prepared sample started to take up hydrogen at nearly room temperature and eventually absorbed 6.8 wt% hydrogen at 200 °C. The apparent activation energy (Ea) of hydrogen absorption for the sample was decreased to 26.7 kJ/mol, much lower than that of other reported systems. For the dehydrogenation experiments, the hydrogenated sample could start to release hydrogen at about 275 °C and 6.5 wt% hydrogen was desorbed in 20 min at 325 °C. Interestingly, the prepared samples showed noteworthy air stability. Been placed in the air for 60 min, the dehydrogenation kinetics and hydrogen capacity of the three samples were basically unchanged, making it possible to be used in future commercial applications. |
| |
| Keywords: | Hydrogen storage Nanocrystalline Mg Carbon layer Air stability |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
