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作者
作者:Huang, JM (Huang, J. M.)[1,2 ]; Ouyang, LZ (Ouyang, L. Z.)[1,2,3 ]; Wen, YJ (Wen, Y. J.)[1,2 ]; Wang, H (Wang, H.)[1,2 ]; Liu, JW (Liu, J. W.)[1,2 ]; Chen, ZL (Chen, Z. L.)[1,2 ]; Zhu, M (Zhu, M.)[1,2 ]
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文献类型:Article
摘要
Nickel has shown to be a good catalyst for improving the hydrolysis performances of hydrogenated Mg3RE (abbreviated as H-Mg3RE, RE = La, Ce, Pr, Nd) through investigating the hydrolysis kinetics and mechanisms of hydrogenated Mg3RENi0.1 (abbreviated as H-Mg3RENi0.1). A material with superior hydrolysis performance, namely H-Mg3CeNi0.1 has been identified, which can generate 276 mL g(-1) min(-1) hydrogen in the first 1.5 min and achieve a total yield of 1088 mL g(-1). Ni served to modify the hydrolysis mechanisms of H-Mg3La, H-Mg3Pr, and H-Mg3Nd to improve their hydrolysis properties. Moreover, Ni has been found to promote the direct hydrolysis of CeH3 to GeO2 to liberate more hydrogen and to render the stable Nd2H5 reactive towards water. Therefore, the studied H-Mg3RE systems all show improved hydrolysis properties after the addition of Ni. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
关键词
作者关键词:Hydrogen production; Hydrolysis; Hydrides; Rare earths; Nickel; Magnesium alloys
作者信息
通讯作者地址:Ouyang, LZ (通讯作者)
 | S China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Guangdong, Peoples R China. |
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出版商
类别分类
研究方向:Chemistry; Electrochemistry; Energy & Fuels
Web of Science 类别:Chemistry, Physical; Electrochemistry; Energy & Fuels
标题
作者
作者:Ouyang, LZ (Ouyang, L. Z.)[1,6 ]; Yang, XS (Yang, X. S.)[1 ]; Zhu, M (Zhu, M.)[1,7 ]; Liu, JW (Liu, J. W.)[1,6 ]; Dong, HW (Dong, H. W.)[1 ]; Sun, DL (Sun, D. L.)[2 ]; Zou, J (Zou, J.)[3,4 ]; Yao, XD (Yao, X. D.)[5,7 ]
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文献类型:Article
摘要
Mg-based materials are promising candidates for high capacity hydrogen storage. However, their poor hydrogenation/dehydrogenation kinetics and high desorption temperature are the main obstacles to their applications. This paper reports a method for in situ formation of cycle stable CeH2.73-MgH2-Ni nanocomposites, from the hydrogenation of as-melt Mg80Ce18Ni2 alloy, with excellent hydrogen storage performance. The nanocomposites demonstrate reversible hydrogen storage capacity of more than 4.0 wt %, at a low desorption temperature with fast kinetics and long cycle life. The temperature for the full hydrogenation/dehydrogenation cycle of the composites is significantly decreased to 505 K, which is about 100 K lower than that for pure Mg. The hydrogen desorption activation energy is 63 +/- 3 kJ/mol H-2 for the composites, which is significantly lower than those of Mg3Ce alloy and pure Mg (104 +/- 7 and 158 +/- 2 kJ/mol H-2, respectively). X-ray diffraction and transmission electron microscopy have been used to reveal the mechanism that delivers this excellent cycle stability and fast hydriding/dehydriding kinetics. It is found that the hydriding/dehydriding process is catalyzed by the combination of in situ formed extremely fine CeH2/CeH2.73 and Ni to Mg/MgH2. In addition, this nanocomposite structure can effectively suppress Mg/MgH2 grain growth and enable the material to maintain its high performance for more than 500 hydrogenation dehydrogenation cycles.
关键词
KeyWords Plus:X-RAY-DIFFRACTION; MAGNESIUM HYDRIDE; ABSORPTION PROPERTIES; SORPTION KINETICS; CRYSTAL-STRUCTURE; MG; DESORPTION; COMPOSITES; MICROSTRUCTURE; SYSTEM
作者信息
通讯作者地址:Zhu, M (通讯作者)
| S China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Peoples R China. |
地址:
出版商
类别分类
研究方向:Chemistry; Science & Technology - Other Topics; Materials Science
Web of Science 类别:Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary