Design of V-Substituted TiFe-Based Alloy for Target Pressure Range and Easy Activation
1
Center for Energy Materials Research, Korea Institute of Science and Technology, Seoul 02792, Korea
2
Division of Materials Science and Engineering, Hanyang University, Seoul 04763, Korea
*
Authors to whom correspondence should be addressed.
†
These authors contributed equally to this paper.
Academic Editor: Haralampos N. Miras
Materials 2021, 14(17), 4829; https://doi.org/10.3390/ma14174829
Received: 4 August 2021
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Revised: 22 August 2021
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Accepted: 23 August 2021
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Published: 25 August 2021
(This article belongs to the Special Issue Applications, Optimization, and Comprehensive Characterization of Hydrogen Storage Materials)
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 P2/P1 ratio, where P1 and P2 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.
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Keywords:
hydrogen storage; TiFe alloy; equilibrium pressure; activation
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MDPI and ACS Style
Faisal, M.; Kim, J.-H.; Cho, Y.W.; Jang, J.-i.; Suh, J.-Y.; Shim, J.-H.; Lee, Y.-S. Design of V-Substituted TiFe-Based Alloy for Target Pressure Range and Easy Activation. Materials 2021, 14, 4829. https://doi.org/10.3390/ma14174829
AMA Style
Faisal M, Kim J-H, Cho YW, Jang J-i, Suh J-Y, Shim J-H, Lee Y-S. Design of V-Substituted TiFe-Based Alloy for Target Pressure Range and Easy Activation. Materials. 2021; 14(17):4829. https://doi.org/10.3390/ma14174829
Chicago/Turabian StyleFaisal, Mohammad, June-Hyung Kim, Young W. Cho, Jae-il Jang, Jin-Yoo Suh, Jae-Hyeok Shim, and Young-Su Lee. 2021. "Design of V-Substituted TiFe-Based Alloy for Target Pressure Range and Easy Activation" Materials 14, no. 17: 4829. https://doi.org/10.3390/ma14174829
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