Improvement of cyclic durability of BCC structured Ti–Cr–V alloys

Itoh, Hideaki; Arashima, Hironobu; Kubo, Katashi; Kabutomori, Toshiki; Ohnishi, Keizo

doi:10.1016/j.jallcom.2004.12.175

Cited by 68 publications

(37 citation statements)

References 9 publications

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“…On the other hand, Itoh et al reported that a homogenized Ti 8 Cr 12 V 80 alloy showed only 1.4% degradation from the initial hydrogenation capacity after 500 cycles under 7 N H 2 . The excellent hydrogenation durability was ascribed to the use of a high content of vanadium in the alloy [15]. Liu et al [16] investigated the extrinsic factors that affect the stability of an MH by dissolution of V from the as-cast TiV-based hydrogen storage alloy electrode under oxidation and corrosion conditions in a 6 M KOH solution.…”

Section: Introductionmentioning

confidence: 99%

Passivation and reactivation of Ti25V35Cr40 hydrides by cycling with impure hydrogen gas

Shen

2015

International Journal of Hydrogen Energy

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Section: Introductionmentioning

confidence: 99%

Passivation and reactivation of Ti25V35Cr40 hydrides by cycling with impure hydrogen gas

Shen

2015

International Journal of Hydrogen Energy

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“…2,3) Note that difference in a bcc and a bct structure is that one axis of a bct unit cell is slightly longer than other two (a = b º c and 1 < c/a¯1.1). 4,5) If the bct distortion of a monohydride phase is an important factor for excellent cyclic stability, it is worth investigating the cyclic stability of V 0.37 Ti 0.33 Mn 0.3 6) which forms a monohydride phase with a large bct distortion (c/a ³ 1.3).…”

Section: Introductionmentioning

confidence: 99%

Improving the Cyclic Stability of V–Ti–Mn bcc Alloys Using Interstitial Elements

2014

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The effect of nitrogen interstitial atoms on the cyclic stability of V 0.37 Ti 0.33 Mn 0.3 was investigated. V 0.37 Ti 0.33 Mn 0.3 with and without nitrogen were hydrogenated and dehydrogenated for 100 times. During hydrogen cycling, the hydrogen absorption plateau pressure of both samples decreased significantly but the desorption plateau pressure stayed the same resulting in smaller hysteresis at higher cycle. Their reversible hydrogen storage capacity progressively diminished with increasing cycle number. At the first cycle, V 0.37 Ti 0.33 Mn 0.3 without nitrogen absorbed more hydrogen than V 0.37 Ti 0.33 Mn 0.3 with nitrogen but at the 100th cycle the situation was reversed; V 0.37 Ti 0.33 Mn 0.3 with nitrogen showed a higher reversible hydrogen storage capacity. This result strongly suggests that nitrogen interstitial atoms somehow retard the degradation of the hydrogen storage capacity of

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“…As potential energy storage materials, vanadium-based hydrogen storage alloys have been extensively researched due to their high hydrogen storage capacity of up to 3.8%, good hydriding and dehydrogenating kinetics, and fast diffusion of hydrogen without the need for high-temperature activation or a catalyst [1][2][3][4][5]. However, pure vanadium has a low effective dehydrogenating capacity and the lag of hydriding and dehydrogenating pressures limits its practical application as a hydrogen storage alloy.…”

Section: Introductionmentioning

confidence: 99%

A theoretical study of the influence of dopants on the dehydrogenation properties of VH2

Liang

2011

Sci. China Chem.

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Using the plane wave ultrasoft pseudopotential method based on the first-principles density functional theory (DFT), the influence on the electronic structure and dehydrogenation properties of VH 2 doped with Zr, Cu and Zn has been studied. The results show that the negative heat of formation increases and the valence electron number at the Fermi level E F , N(E F ) decreases in the Zr-doped model, indicating the higher stability of VH 2 after Zr alloying. On the other hand, the negative heat of formation of VH 2 decreases and the N(E F ) increases in Cu-or Zn-doped systems, suggesting the lower stability of VH 2 after Cu or Zn alloying. The calculated overlap populations and electron densities of the V-H bond demonstrate that the bonding is strengthened by Zr doping and weakened by Cu or Zn doping. The results predict that the maximum capacity to absorb and desorb hydrogen can be raised by the introduction of Zr and reduced by the introduction of Cu or Zn, while the dehydrogenation properties will be poorer in Zr-doped systems and enhanced in Cu-or Zn-doped systems. These predictions are consistent with the experimental results. Mulliken populations were also calculated and it was found that the Mulliken population of the V 3d orbitals decreased as a result of Zr doping, and increased after Cu or Zn doping. element-doped, electronic structure, dehydrogenation properties, first principles calculation

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Improvement of cyclic durability of BCC structured Ti–Cr–V alloys

Cited by 68 publications

References 9 publications

Passivation and reactivation of Ti25V35Cr40 hydrides by cycling with impure hydrogen gas

Passivation and reactivation of Ti25V35Cr40 hydrides by cycling with impure hydrogen gas

Improving the Cyclic Stability of V–Ti–Mn bcc Alloys Using Interstitial Elements

A theoretical study of the influence of dopants on the dehydrogenation properties of VH2

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Improvement of cyclic durability of BCC structured Ti–Cr–V alloys

Cited by 68 publications

References 9 publications

Passivation and reactivation of Ti25V35Cr40 hydrides by cycling with impure hydrogen gas

Passivation and reactivation of Ti25V35Cr40 hydrides by cycling with impure hydrogen gas

Improving the Cyclic Stability of V&ndash;Ti&ndash;Mn bcc Alloys Using Interstitial Elements

A theoretical study of the influence of dopants on the dehydrogenation properties of VH2

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Improving the Cyclic Stability of V–Ti–Mn bcc Alloys Using Interstitial Elements