Hydrogen storage properties of Ti0.95FeZr0.05, TiFe0.95Zr0.05 and TiFeZr0.05 alloys

Lv, Peng; Huot, Jacques

doi:10.1016/j.ijhydene.2016.07.091

Cited by 66 publications

(16 citation statements)

References 14 publications

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“…It can be noticed that both the absorption and the desorption plateau pressure decrease with an increasing amount of hafnium. This effect has already been observed when zirconium is added as a dopant [17,18]. This means that the thermodynamics is slightly changed for a high amount of Hf.…”

Section: Pressure-composition-isothermsmentioning

confidence: 73%

Effect of Hafnium Addition on the Hydrogenation Process of TiFe Alloy

2019

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The alloy TiFe has interesting hydrogen storage properties for practical applications: low cost, operation at room temperature, and good hydrogen capacity. However, the first hydrogenation is difficult and increases the cost of the alloy. In this work, we studied the effect of adding hafnium to TiFe in order to enhance the first hydrogenation process. TiFe + x Hf alloys, with x = 0, 4, 8, 12, and 16 wt.%, were synthesized by arc melting. The microstructure of the as-cast alloys was investigated by scanning electron microscopy and electron microprobe analysis. These alloys consisted of B2-TiFe, C14-Laves, and BCC (Body Centered Cubic) phases. A minimum of 8 wt.% of hafnium is required to obtain an enhancement of the first hydrogenation. In the first hydrogenation, the material reaches its maximal hydrogen capacity in less than two hours at room temperature and under 20 bars of hydrogen. Hafnium addition also had the effect of lowering the plateau pressure in the pressure-composition isotherm. It could be concluded that hafnium has a positive effect on the activation properties of TiFe.

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Section: Pressure-composition-isothermsmentioning

confidence: 73%

Effect of Hafnium Addition on the Hydrogenation Process of TiFe Alloy

2019

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“…The presence of Ti and Fe may not be responsible for slow hydrogen transport into the bulk, because it is generally believed that the interphase boundaries in TiFe can act as hydrogen pathways for activation. [11][12][13][14][15][16][17][18][19] Although Fe is believed to act as a catalyst for surface activation of TiFe, the presence of Ti and Fe oxides on the surface may not make a positive effect for hydrogen dissociation. [10] Taken altogether, although the HPT process shows high capability to synthesize the nanograined TiFe intermetallics, such synthesis method is not able to reduce the activation temperature of synthesized material to room temperature.…”

Section: Discussionmentioning

confidence: 99%

“…[32,68,69] In summary, this study together with earlier studies on the application of HPT for synthesis [54][55][56][57][58] or processing [49][50][51][52][53] of hydrogen storage materials confirm the potential of method for future developments in this field. As the addition of a third element to TiFe, such as Pd, [11] Ni, [12] Mn, [13][14][15][16] and Zr, [17][18][19] can facilitate the activation, synthesis of such ternary intermetallics by HPT can be considered as a potential future application.…”

Section: Discussionmentioning

confidence: 99%

“…[4][5][6] In 1974, the first successful results on hydrogen storage in TiFe at room temperature were reported by Reilly and Wiswall, but they found that the as-cast material should be activated by repeated exposure to vacuum and hydrogen atmosphere at temperatures as high as 673 K. [4] Later studies also showed that despite all advantages of TiFe, its difficult activation is a main drawback. [7][8][9][10] There have been several attempts to solve the activation problem of as-cast TiFe mainly using two strategies: 1) chemical activation by addition of a third element, such as Pd, [11] Ni, [12] Mn, [13][14][15][16] and Zr [17][18][19] and 2) mechanical activation by ball milling, [20][21][22] high-pressure torsion (HPT), [23][24][25] and cold rolling. [26,27] Although the exact mechanism for the activation of TiFe is still under argument, it is generally believed that the first strategy is based on the surface catalytic performance of elemental additives, and the second strategy is based on nanostructuring and introduction of hydrogen pathways into bulk, such as cracks, nanograin boundaries, and amorphous regions.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Nanostructured TiFe Hydrogen Storage Material by Mechanical Alloying via High‐Pressure Torsion

et al. 2020

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TiFe as a room-temperature hydrogen storage material is usually synthesized by ingot casting in the coarse-grained form, but the ingot needs a thermal activation treatment for hydrogen absorption. Herein, nanograined TiFe is synthesized from the titanium and iron powders by severe plastic deformation (SPD) via the high-pressure torsion (HPT). The phase transformation to the TiFe intermetallic is confirmed by X-ray diffraction, hardness measurement, scanning/transmission electron microscopy, and automatic crystal orientation and phase mappings (ASTAR device). It is shown that the HPT-synthesized TiFe can store hydrogen at room temperature with a reasonable kinetics, but it still needs an activation treatment. A comparison between the current results and those achieved on high activity of HPT-processed TiFe ingot suggests that a combination of ingot casting and SPD processing is more effective than synthesis by SPD to overcome the activation problem of TiFe.

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“…In general, activation has to be performed at high temperature and under high hydrogen pressure during a long time [3]. In order to reduce the cost and use the TiFe in a large-scale production, the activation should ideally be done at room temperature and under mild hydrogen pressure [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

First Hydrogenation Enhancement in TiFe Alloys for Hydrogen Storage Doped with Yttrium

Gosselin

Huot

2019

Metals

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The aim of this investigation was to improve the first hydrogenation of TiFe by adding yttrium. The compositions studied were TiFe + x wt.% Y with x = 4, 6, and 8. From electron microscopy it was found that all alloys were multiphase with a matrix of TiFe phase containing less than 0.4 at.% of Y and a secondary phase rich in yttrium. When x increased, the chemical compositions of the matrix changed and the secondary phase changed. The sample with 8% of yttrium had the fastest kinetics. The hydrogen capacity increased with the amount of Y.

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Hydrogen storage properties of Ti0.95FeZr0.05, TiFe0.95Zr0.05 and TiFeZr0.05 alloys

Cited by 66 publications

References 14 publications

Effect of Hafnium Addition on the Hydrogenation Process of TiFe Alloy

Effect of Hafnium Addition on the Hydrogenation Process of TiFe Alloy

Synthesis of Nanostructured TiFe Hydrogen Storage Material by Mechanical Alloying via High‐Pressure Torsion

First Hydrogenation Enhancement in TiFe Alloys for Hydrogen Storage Doped with Yttrium

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