Activation of Ti–Fe–Cr alloys containing identical AB2 fractions

Kim, Hayoung; Faisal, Mohammad; Lee, Sang In; Jung, Jee Yun; Kim, Han Jin; Hong, Jihyun; Lee, Young-Su; Shim, Jae Hyeok; Cho, Young Whan; Kim, Do Hyang; Suh, Jin‐Yoo

doi:10.1016/j.jallcom.2021.158876

Cited by 30 publications

(3 citation statements)

References 35 publications

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“…As another class of solid-state materials for H 2 storage, AB 2 -type alloys (such as TiMn 2 alloys) − have been widely studied for their cheap price, relatively high weight storage capacity (∼2.0 wt %), and fast hydrogen absorption and desorption rates at room temperature. Unfortunately, the poor activation behavior and element segregation hinder their practical application.…”

Section: Introductionmentioning

confidence: 99%

Ce-Doped TiZrCrMn Alloys for Enhanced Hydrogen Storage

Zhou

et al. 2022

Energy Fuels

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Hydrogen storage is one of the key steps that restricts the large-scale application of hydrogen energy and fuel cells. In this work, we developed an efficient H2 storage material by Ce doping in the TiZrCrMn alloy and systemically studied the effect of Ce on the microstructure, activation, and hydrogen storage properties. The results indicated that Ce addition in the Ti0.8Zr0.2Cr0.75Mn1.25 alloy did not change the major phase structure of Laves C14 but slightly increased the lattice constants and resulted in the formation of a CeO2 phase. It is interesting to find that Ce inhibited the enrichment of the Ti phase, inducing a homogeneous elemental distribution throughout the alloy. Hydrogenation and dehydrogenation tests indicated that the Ce-added alloy exhibited H2 absorption and effective desorption capacities of up to 1.98 and 1.79 wt %, respectively, higher than those of TiZrCrMn alloys reported in the literature. Ce also improved the activation of the alloy at room temperature and enhanced the cyclic performance during the hydrogenation and dehydrogenation. The activation energy, enthalpy change, and entropy change of the alloys upon hydrogenation and dehydrogenation were calculated and a small change was observed after Ce addition.

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Section: Introductionmentioning

confidence: 99%

Ce-Doped TiZrCrMn Alloys for Enhanced Hydrogen Storage

Zhou

et al. 2022

Energy Fuels

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“…Room-temperature activation of TiFe alloys has been also evidenced by the introduction of Cr and Zr as substituents, modifying the microstructure and activation mechanism [250,251]. Based on the Ti-Fe-Cr ternary phase diagram, alloys containing 80 at% Ti(Fe, Cr) and 20 at% Ti(Fe, Cr) 2 were prepared [251]. Activation at RT was achieved when the overall Cr concentration is higher than 9.7 at%.…”

Section: Tife-based Alloysmentioning

confidence: 99%

Magnesium- and intermetallic alloys-based hydrides for energy storage: modelling, synthesis and properties

et al. 2022

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Hydrides based on magnesium and intermetallic compounds provide a viable solution to the challenge of energy storage from renewable sources, thanks to their ability to absorb and desorb hydrogen in a reversible way with a proper tuning of pressure and temperature conditions. Therefore, they are expected to play an important role in the clean energy transition and in the deployment of hydrogen as an efficient energy vector. This review, by experts of Task 40 ‘Energy Storage and Conversion based on Hydrogen’ of the Hydrogen Technology Collaboration Programme of the International Energy Agency, reports on the latest activities of the working group ‘Magnesium- and Intermetallic alloys-based Hydrides for Energy Storage’. The following topics are covered by the review: multiscale modelling of hydrides and hydrogen sorption mechanisms; synthesis and processing techniques; catalysts for hydrogen sorption in Mg; Mg-based nanostructures and new compounds; hydrides based on intermetallic TiFe alloys, high entropy alloys, Laves phases, and Pd-containing alloys. Finally, an outlook is presented on current worldwide investments and future research directions for hydrogen-based energy storage.

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“…For instance, easy activation of Zr-added TiFe alloy reported in some studies [13][14][15][16] is likely due to the formation of Ti-Fe-Zr-based ternary alloy: Faisal et al [17] recently reported that single-phase Ti-Fe-Zr ternary alloys in the C14 structure were easily activated under 3 MPa of hydrogen pressure at room temperature. Likewise, Cr-added TiFe alloy could be activated at room temperature with the help of a Ti(Fe,Cr) 2 phase in the C14 structure [18][19][20]. However, in those studies, the two-step plateaus became more pronounced after alloying, i.e., P 2 /P 1 became larger.…”

Section: Introductionmentioning

confidence: 96%

Design of V-Substituted TiFe-Based Alloy for Target Pressure Range and Easy Activation

et al. 2021

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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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Activation of Ti–Fe–Cr alloys containing identical AB2 fractions

Cited by 30 publications

References 35 publications

Ce-Doped TiZrCrMn Alloys for Enhanced Hydrogen Storage

Ce-Doped TiZrCrMn Alloys for Enhanced Hydrogen Storage

Magnesium- and intermetallic alloys-based hydrides for energy storage: modelling, synthesis and properties

Design of V-Substituted TiFe-Based Alloy for Target Pressure Range and Easy Activation

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