Hydrogen absorbing properties and structures of Ti–Cr–Mo alloys

Kubo, Katashi; Itoh, Hideaki; Takahashi, Tatsuya; Ebisawa, T.; Kabutomori, Toshiki; Nakamura, Yumiko; Akiba, Etsuo

doi:10.1016/s0925-8388(03)00228-7

Cited by 53 publications

(33 citation statements)

References 8 publications

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“…For example, the size of the tetrahedral hydrogen site in the b.c.c. Ti-Cr-Mo alloy 14) increases with decreasing unit cell volume, lowering the plateau pressure. In the RNi 5 -H system, two hydrogen sites correspond to the lower and higher plateaux.…”

Section: Resultsmentioning

confidence: 97%

Appearance of a Novel Pressure Plateau in RNi<SUB>5</SUB>-H (R = Rare Earth) Systems

et al. 2005

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We investigated the hydrogen storage properties in a HoNi 5 -H system combined with TbNi 5 -H and DyNi 5 -H systems. Pressurecomposition (P-C) isotherms in the HoNi 5 -H system show one reversible pressure plateau during hydrogen absorption and desorption with a hysteretic phase transition. The maximum hydrogen storage capacity was found to be H/HoNi 5 ¼ ca. 2, and no second plateau similar to that observed in other RNi 5 -H (R: rare earth) systems was observed, even at 196 K. Two pressure plateaux found in light rare earth-based R L Ni 5 -H (R L ¼ La, Pr, Nd, Sm and Gd) systems tend to disappear in TbNi 5 -H and DyNi 5 -H systems and are scarcely present in HoNi 5 -H system. On the other hand, a novel pressure plateau appears at low hydrogen content in these systems due to the presence of a new hydride phase, and the plateau region extends from TbNi 5 -H and DyNi 5 -H to HoNi 5 -H systems. Contrary to the other plateaux, the pressures of the novel plateau during both hydrogen absorption and desorption decrease with decreasing unit cell volume of RNi 5 compounds or with increasing atomic number of the R element in RNi 5 -H systems. To clarify the effect of 4f electrons in the R element in RNi 5 -H systems on the novel plateau, we have evaluated the hydrogen storage properties in an YNi 5 -H system. Our results show that YNi 5 compound with lattice constants similar to those of TbNi 5 and DyNi 5 compounds has a similar P-C isotherm, suggesting that 4f electrons has no direct influence on the appearance of the novel plateau.

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Section: Resultsmentioning

confidence: 97%

Appearance of a Novel Pressure Plateau in RNi<SUB>5</SUB>-H (R = Rare Earth) Systems

et al. 2005

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“…However, in TiCrMo, the correlation of dissociation pressure and lattice constant has a different trend from TiCrV [16]. Kubo et al have also reported the same trend for TiCrMo alloys [13]. These studies imply that Mo has an effect to increase the dissociation pressure of the metal hydride.…”

Section: 2mentioning

confidence: 94%

“…TiCrV alloy with BCC structure has been studied for years as a promising hydrogen storage material [6][7][8][9][10][11][12][13][14][15]. It has two plateau pressures, where only the upper plateau pressure area can be used for reversible hydrogen storage in normal condition.…”

Section: Introductionmentioning

confidence: 99%

TiCrVMo alloys with high dissociation pressure for high-pressure MH tank

Matsunaga

Kon

Washio

et al. 2009

International Journal of Hydrogen Energy

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High-pressure metal hydride (MH) tank is a possible hydrogen storage system for fuel cell vehicles. The merit of the high-pressure MH tank system is improved by the use of a metal hydride with high dissociation pressure. In this study, TiCrV and TiCrVMo alloys with BCC structure has been developed for the high-pressure MH tank system. The developed TiCrVMo alloy shows 2.4 mass% of effective hydrogen capacity between 0.1 MPa and 33 MPa at 298 K, which has a dissociation pressure of 2.3 MPa at 298 K. By investigating the dissociation pressures of the synthesized metal hydrides, it is found that Mo has a special effect to increase dissociation pressure of the metal hydrides. This effect is probably attributed to the large bulk modulus of Mo compared to other elements.

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“…BCC alloys of systems Ti-V-Mn and Ti-V-Cr have been intensively studied for hydrogen storage [37][38][39][40][41][42]. They could also be used as catalyst for magnesium [43].…”

Section: Ti-based Bccmentioning

confidence: 99%

Nanocrystalline Metal Hydrides Obtained by Severe Plastic Deformations

Huot

2012

Metals

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It has recently been shown that Severe Plastic Deformation (SPD) techniques could be used to obtain nanostructured metal hydrides with enhanced hydrogen sorption properties. In this paper we review the different SPD techniques used on metal hydrides and present some specific cases of the effect of cold rolling on the hydrogen storage properties and crystal structure of various types of metal hydrides such as magnesium-based alloys and body centered cubic (BCC) alloys. Results show that generally cold rolling is as effective as ball milling to enhance hydrogen sorption kinetics. However, for some alloys such as TiV 0.9 Mn 1.1 alloy ball milling and cold rolling have detrimental effect on hydrogen capacity. The exact mechanism responsible for the change in hydrogenation properties may not be the same for ball milling and cold rolling. Nevertheless, particle size reduction and texture seems to play a leading role in the hydrogen sorption enhancement of cold rolled metal hydrides.

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Hydrogen absorbing properties and structures of Ti–Cr–Mo alloys

Cited by 53 publications

References 8 publications

Appearance of a Novel Pressure Plateau in RNi<SUB>5</SUB>-H (R = Rare Earth) Systems

Appearance of a Novel Pressure Plateau in RNi<SUB>5</SUB>-H (R = Rare Earth) Systems

TiCrVMo alloys with high dissociation pressure for high-pressure MH tank

Nanocrystalline Metal Hydrides Obtained by Severe Plastic Deformations

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