Hydrogen storage behavior and microstructural feature of a TiFe-ZrCr2 alloy
- Hydrogen storage behavior and microstructural feature of a TiFe-ZrCr2 alloy
- 조영환; 서진유; 심재혁; 김동익; 이영수; 홍지현; 이상인; 하태준; 황병철; 이준호
- Hydrogenation; Scanning electron microscopy; Hydrogen storage; Metal hydride; TiFe alloy; Microstructure; Electron back-scattered diffraction
- Issue Date
- Journal of alloys and compounds
- VOL 853, NO 1-157099
- The microstructural feature as well as the hydrogen storage properties of as-cast and annealed TiFe-6 wt% ZrCr2 alloy samples has been investigated. Three phases, TiFe with the BCC structure, TiFe2 with the C14 Laves hexagonal structure and Ti2Fe with a cubic structure, are observed in both alloy samples, although the amount of TiFe2 as a second phase is significantly reduced with a fragmented shape in the annealed sample. Both samples are hydrogenated under 31 bar of hydrogen at room temperature without a harsh activation process, although the annealed sample is hydrogenated after an incubation period of approximately 40 h. The pressure-composition-temperature curves of both samples are not much different from each other, exhibiting a maximum capacity of 1.7 wt% H2. No significant degradation of hydrogen capacity is observed during 50 cycles of hydrogen sorption for the as-cast sample. The second phase TiFe2 regions seem to assist the first hydrogenation of the alloy by acting as gateways for supplying hydrogen to the inside of the alloy.
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