Microstructure and modified hydrogen generation performance via hydrolysis of Mg-Nd-Ni alloys
| Autor: | Xiaomin Wang, Jiahao Ren, Zhixin Ba, Fei Chen, Lishuai Xie, Yaqiu Qin |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Alloy Energy Engineering and Power Technology 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences 0104 chemical sciences Hydrolysis Fuel Technology Distilled water Chemical engineering engineering Composition (visual arts) 0210 nano-technology Ternary operation Eutectic system Hydrogen production |
| Zdroj: | International Journal of Hydrogen Energy. 46:15288-15297 |
| ISSN: | 0360-3199 |
| Popis: | Mg–Nd binary and Mg-Nd-Ni ternary alloys with different Nd/Ni contents are successfully synthesized via near equilibrium solidification in the present work. Alternately distributed irregular Mg, stripe-like Mg2Ni and block-like Mg12Nd are clearly observed in Mg-Nd-Ni alloys. The morphologies of as-melt alloys are composition dependent. It is found that Mg–Nd binary alloy shows extremely sluggish hydrolysis kinetics and low hydrogen yield in both distilled water and 5% MgCl2 solution. However, Ni can significantly enhance the hydrolysis properties of Mg. The hydrolysis kinetics and conversion rate improve obviously with the increase of Ni in as-melt Mg-Nd-Ni alloys. As-melt ternary alloys with abundant eutectic microstructures show superior hydrolysis performance. In addition, the hydrolysis properties of as-melt alloys in MgCl2 solution are much better than those in distilled water. The conversion rate of Mg-9Nd8Ni (mass%) alloy in 5% MgCl2 solution is as high as 94.7%. After hydrolysis, Mg2Ni and Mg12Nd phases are retained. For Mg-9Nd8Ni alloy, both primary Mg crystals and eutectic regions are partially hydrolyzed within only 10 s of hydrolysis in distilled water. This work shows that microstructure optimization is feasible to modify the hydrogen generation performance of Mg-based alloys. |
| Databáze: | OpenAIRE |
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