Faisal, Mohammad Kim, June-Hyung Cho, Young Whan Jang, Jae-il Suh, Jin-Yoo Shim, Jae-Hyeok Lee, Young-Su 2024-01-19T14:01:08Z 2024-01-19T14:01:08Z 2022-01-10 2021-09 1996-1944 https://pubs.kist.re.kr/handle/201004/116511 Titanium iron (TiFe) alloy is a room-temperature hydrogen-storage material, and it absorbs hydrogen via a two-step process to form TiFeH and then TiFeH2. The effect of V addition in TiFe alloy was recently elucidated. The V substitution for Ti sublattice lowers P-2/P-1 ratio, where P-1 and P-2 are the equilibrium plateau pressure for TiFe/TiFeH and TiFeH/TiFeH2, respectively, and thus restricts the two-step hydrogenation within a narrow pressure range. The focus of the present investigation was to optimize the V content such that maximum usable storage capacity can be achieved for the target pressure range: 1 MPa for absorption and 0.1 MPa for desorption. The effect of V substitution at selective Ti or Fe sublattices was closely analyzed, and the alloy composition Ti46Fe47.5V6.5 displayed the best performance with ca. 1.5 wt.% of usable capacity within the target pressure range. At the same time, another issue in TiFe-based alloys, which is a difficulty in activation at room temperature, was solved by Ce addition. It was shown that 3 wt.% Ce dispersion in TiFe alloy imparted to it easy room-temperature (RT) activation properties. English MDPI HYDROGEN STORAGE PROPERTIES PHASE-EQUILIBRIA FE MN ZR MICROSTRUCTURE CE CO CR Design of V-Substituted TiFe-Based Alloy for Target Pressure Range and Easy Activation Article 10.3390/ma14174829 1 MATERIALS, v.14, no.17 MATERIALS 14 17 scie scopus 000694370200001 2-s2.0-85114008554 Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Physics, Applied Physics, Condensed Matter Chemistry Materials Science Metallurgy & Metallurgical Engineering Physics Article HYDROGEN STORAGE PROPERTIES PHASE-EQUILIBRIA FE MN ZR MICROSTRUCTURE CE CO CR hydrogen storage TiFe alloy equilibrium pressure activation