Effects of spinning rate on structures and electrochemical hydrogen storage performances of RE–Mg–Ni–Mn-based AB2-type alloys
| Autor: | Yanghuan Zhang, Wei Zhang, Peilong Zhang, Yongguo Zhu, Yan Qi, Xi-ping Song |
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| Rok vydání: | 2016 |
| Předmět: |
Chemical substance
Materials science Metallurgy Metals and Alloys 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Condensed Matter Physics Electrochemistry 01 natural sciences 0104 chemical sciences law.invention Hydrogen storage Lattice constant Chemical engineering Magazine law Phase (matter) Materials Chemistry Melt spinning 0210 nano-technology Spinning |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 26:3219-3231 |
| ISSN: | 1003-6326 |
| Popis: | La was partially substituted by Ce with the aim of improving the electrochemical hydrogen storage performances of La1–xCexMgNi3.5Mn0.5 (x = 0, 0.1, 0.2, 0.3, 0.4) alloys, and melt spinning technology was adopted to fabricate the alloys. The identification of XRD and SEM reveals that the experimental alloys consist of a major phase LaMgNi4 and a secondary phase LaNi5. The growth of spinning rate results in that the lattice constants and cell volume increase and the grains are markedly refined. The electrochemical measurement shows that the as-cast and spun alloys can obtain the maximum discharge capacities just at the first cycle without any activation needed. With the increase of spinning rate, the discharge capacities of the alloys first increase and then decline, whereas their cycle stabilities always grow. Moreover, the electrochemical kinetic performances of the alloys first increase and then decrease with spinning rate growing. |
| Databáze: | OpenAIRE |
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