Enhanced hydrogen storage properties of Ti–Cr–Nb alloys by melt-spin and Mo-doping |
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| Affiliation: | 1. Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, 341000, China;2. Ganjiang Innovation Academy, Jiangxi Institute of Rare Earths, Chinese Academy of Sciences, Ganzhou, 341000, China;1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang, 330063, PR China;2. Institute of Applied Physics, Jiangxi Academy of Sciences, Nanchang, 330029, PR China;1. School of Materials Science and Engineering, Central South University, Changsha, 410083, Hunan, PR China;2. Yangtze Delta Region Institute (Huzhou) & School of Physics, University of Electronic Science and Technology of China, Huzhou, 313001, Zhejiang, PR China;3. Guangxi Crystal Union Photoelectric Materials Co. Ltd., No. 12, Yanghe North Road, Yanghe Industrial Development Zone, Liuzhou, 545036, Guangxi, PR China;1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China;2. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, China;1. Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang, 621907, Sichuan, China;2. Institute of Materials, China Academy of Engineering Physics, Mianyang, 621900, Sichuan, China;1. College of Materials Science and Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, PR China;2. Jiangsu Collaborative Innovation Centre for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing, 211816, PR China;3. Department of Materials Science, Fudan University, Shanghai, 200433, PR China |
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| Abstract: | Ti–Cr–Nb hydrogen storage alloys with a body centered cubic (BCC) structure have been successfully prepared by melt-spin and Mo-doping. The crystalline structure, solidification microstructural evolution, and hydrogen storage properties of the corresponding alloys were characterized in details. The results showed that the hydrogen storage capacity of Ti–Cr–Nb ingot alloys increased from 2.2 wt% up to around 3.5 wt% under the treatment of melt-spin and Mo-doping. It is ascribed that the single BCC phase of Ti–Cr–Nb alloys was stabilized after melt-spin and Mo-doping, which has a higher theoretical hydrogen storage site than the Laves phase. Furthermore, the melt-spin alloy after Mo doping can further effectively increase the de-/absorption plateau pressure. The hydrogen desorption enthalpy change ΔH of the melt-spin alloy decreased from 48.94 kJ/mol to 43.93 kJ/mol after Mo-doping. The short terms cycling test also manifests that Mo-doping was effective in improving the cycle durability of the Ti–Cr–Nb alloys. And the BCC phase of the Ti–Cr–Nb alloys could form body centered tetragonal (BCT) or face center cubic (FCC) hydride phase after hydrogen absorption and transform to the original BCC phase after desorption process. This study might provide reference for developing reversible metal hydrides with favorable cost and acceptable hydrogen storage characteristics. |
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| Keywords: | Hydrogen storage Melt-spin Microstructural evolution Mo-doping |
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