Enhanced Hydrogen Ab/De-sorption of Mg(Zn) solid solution alloy catalyzed by YH2/Y2O3 nanocomposite |
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| Affiliation: | 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. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an, 710072, China;2. School of Materials and Chemical Engineering, Xi''an Technological University, Xi''an, 710072, China;1. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, PR China;1. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou, 014010, China;2. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing, 100081, China;3. Weishan Cisri-Rare Earth Materials Co., Ltd., Jining, 277600, China;1. National Engineering Research Center of Light Alloy Net Forming & State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, PR China;2. Shanghai Engineering Research Center of Mg Materials and Applications & School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China;3. Center of Hydrogen Science, Shanghai Jiao Tong University, Shanghai, 200240, PR China;4. Shanghai Mg Power Technology Co, Ltd., Shanghai, 200240, PR China;1. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou, 014010, China;2. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing, 100081, China;3. Weishan Cisri Rare Earth Materials Co. Ltd., Jining, 277600, Shandong, China |
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| Abstract: | YH2/Y2O3 nanocomposite was prepared and introduced to Mg0.97Zn0.03 solid solution alloy forming a nanocomposite of Mg0.97Zn0.03-10 wt%YH2/Y2O3 by mechanical milling. The phase components and microstructure were systematically investigated by XRD, SEM and STEM. Hydrogenation of Mg0.97Zn0.03 solid solution resulted in phase segregation into MgH2 and intermetallic compound MgZn2. The in-situ formed ultra-fine MgZn2 homogeneously dispersed in MgH2 matrix, and returned to Mg(Zn) solid solution through dehydrogenation. This reversible phase transition of Mg(Zn) solid solution benefited to thermodynamic destabilization of MgH2. The co-dopant of YH2 and Y2O3 exhibited synergistic catalytic effects on the hydrogen absorption and desorption of Mg0.97Zn0.03 solid solution alloy. As a result, Mg0.97Zn0.03-10 wt%YH2/Y2O3 nanocomposite showed significantly improved kinetics with obviously lowered hydriding and dehydriding activation energy of 45.8 kJ?mol?1?H2 and 74.7 kJ?mol?1?H2, respectively, and the enthalpy of hydrogen desorption was reduced to 72.2 kJ?mol?1?H2. |
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| Keywords: | Mg Hydrogen storage Catalyst Hydrogenation Nanocomposite |
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