Microstructure and hydrogen storage properties of V48Fe12Ti15-xCr25Alx (x=0, 1) alloys |
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| Affiliation: | 1. School of Metallurgy, Northeastern University, Shenyang 110819, China;2. Analytical and Testing Center, Inner Mongolia University of Science and Technology, Baotou 014010, China;1. State Key Laboratory of Advanced Special Steels & Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University, 149 Yanchang Road, Shanghai 200072, China;2. Materials Genome Institute, Shanghai University, 99 Shangda Road, Shanghai 200444, China;3. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences Shanghai, Changning Road, No. 856, Shanghai 200050, China;1. State Key Laboratory of Advanced Special Steel, Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;2. Shanghai Special Casting Engineering Technology Research Center, Shanghai 201605, China;1. Faculty of Materials and Industrial Engineering, Babol Noshirvani University of Technology, P.O.Box 47148-71167, Shariati Street, Babol, Iran;2. Hydrogen Research Institute, Université du Québec à Trois-Rivières, 3351 des Forges, Trois-Rivières, G9A 5H7, Canada;1. Université de Lorraine, Laboratory of Excellence on Design of Alloy Metals for Low-mass Structures (DAMAS), Metz F-57045, France;2. Université de Lorraine, Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux, LEM3 UMR 7239, 7 Rue Félix Savart, BP 15082, Metz F-57073, France;3. WPI, International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka, Japan;4. Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka, Japan;5. International Research Center for Hydrogen Energy, Kyushu University, Fukuoka, Japan;6. Kyusyu University Platform of Inter/Transdisciplinary Energy Research, Fukuoka, Japan |
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| Abstract: | The microstructure and hydrogen storage characteristics of V48Fe12Ti15-xCr25Alx (x = 0, 1) alloys prepared by vacuum arc melting were studied by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and pressure–composition isotherm measurements. It was confirmed that all of the alloys comprise a BCC phase, a Ti-rich phase, and a TiFe phase. Al as a substitute for part of the Ti content caused an increase of lattice parameters of the BCC phase and of the equilibrium pressures of hydrogen desorption, but decrease of the hydrogen storage capacities. The kinetic mechanism of the hydrogenation and dehydrogenation of the alloys was investigated by the classical Johnson–Mehl–Avrami equation. The reaction enthalpies (ΔH) for the dehydrogenation of alloys without and with Al were calculated by the Van't Hoff equation based on the PCI measurement data, which are 30.12 ± 0.14 kJ/mol and 28.02 ± 0.46 kJ/mol, respectively. The thermal stability of the metal hydride was measured by differential scanning calorimetry. The hydrogen desorption activation energies were calculated using the Kissinger method as 79.41 kJ/mol and 83.56 kJ/mol for x = 0 and 1, respectively. The results suggest that the substitution of titanium with aluminum improves the thermodynamic properties of hydrogen storage and reduces the kinetic performance of hydrogen desorption. |
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| Keywords: | V-based alloy Hydrogen storage Microstructure Kinetic mechanism Thermodynamic properties |
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