Hydrogen storage properties of multi-principal-component CoFeMnTixVyZrz alloys |
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| Authors: | Yih-Farn Kao Swe-Kai Chen Jen-Haur Sheu Jiun-Ting Lin Wei-En Lin Jien-Wei Yeh Su-Jien Lin Tzung-Hsien Liou Chia-Wen Wang |
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| Affiliation: | 1. Department of Materials Science and Engineering, National Tsing Hua University, 101 Kuang Fu Road Sec. 2, Hsinchu 30013, Taiwan, ROC;2. Center for Nanotechnology, Materials Science, and Microsystems (CNMM), National Tsing Hua University, 101 Kuang Fu Road Sec. 2, Hsinchu 30013, Taiwan, ROC;3. High-entropy Alloys Lab., National Tsing Hua University, 101 Kuang Fu Road Sec. 2, Hsinchu 30013, Taiwan, ROC |
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| Abstract: | This study presents an innovative multi-principal-element CoFeMnTiVZr alloy system for the absorption and desorption of hydrogen. Pressure-composition-isotherms (PCIs) demonstrate that CoFeMnTixVZr, CoFeMnTiVyZr, and CoFeMnTiVZrz can absorb and desorb hydrogen for x, y, and z that satisfy 0.5 ≤ x ≤ 2.5, 0.4 ≤ y ≤ 3.0, and 0.4 ≤ z ≤ 3.0, respectively. X-ray diffraction (XRD) reveals that CoFeMnTixVyZrz alloys have a simple C14 Laves phase with a single set of lattice parameters before and after PCI tests. The distributions of each element in CoFeMnTixVyZrz alloys are roughly equal, as revealed by SEM/EDS mapping. The effects of values x, y, and z on the hydrogen storage properties are elucidated in terms of lattice constant, element segregation, hydride formation enthalpies of the alloy components and hydrogen, and the averaged formation enthalpy. The high-entropy effect promotes the formation of a single C14 Laves phase, and the maximum hydrogen storage capacity is strongly related to the hydride formation enthalpy of the alloy and hydrogen. |
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| Keywords: | Multi-principal-element alloy system CoFeMnTiVZr Pressure-composition-isotherms Hydride formation enthalpy C14 Laves phase |
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