Influence of Cr on the hydrogen storage properties of Ti-rich Ti–V–Cr alloys

Suwarno, Suwarno; Solberg, Jan Ketil; Mæhlen, Jan Petter; Krogh, B.; Yartys, V.A.

doi:10.1016/j.ijhydene.2012.01.149

Cited by 36 publications

(11 citation statements)

References 13 publications

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“…The activation energy of the main event E A,1b tends to decrease with increasing z. This behaviour is similar to what was observed by Suwarno et al for the Ti-rich Ti-V-Cr system under addition of Cr to the alloy [24]. A similar trend is observed for event 1a with activation energy E A,1a .…”

Section: Thermal Analysis and Sieverts Measurementssupporting

confidence: 88%

The Influence of Fe on the Structure and Hydrogen Sorption Properties of Ti-V-Based Metal Hydrides

et al. 2020

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Ti-V-based metal hydrides have decent overall performance as hydrogen storage materials, but V is expensive and it is therefore tempting to replace it by less expensive ferrovanadium containing about 20% Fe. In the present work we have investigated how Fe influences the structure and hydrogen storage properties of (Ti0.7V0.3)1−zFez alloys with e r r o r t y p e c e z ∈ { 0 , 0.03, 0.06, 0.1, 0.2, 0.3} using synchrotron radiation powder X-ray diffraction, thermogravimetric analysis, differential scanning calorimetry and manometric measurements performed in a Sieverts apparatus. The alloys form body-centered cubic (bcc) crystal structures for all considered values of z, and the addition of Fe causes the unit cell to contract. When exposed to hydrogen gas, the bcc alloys form face-centered cubic (fcc) hydrides if e r r o r t y p e c e z ≤ 0 . 1 while other hydrogen-containing phases are formed for higher Fe-contents. The hydrogen capacities of the fcc hydrides at 20 bar are not significantly influenced by the addition of Fe and reach 3.2(3) wt% in (Ti0.7V0.3)0.9Fe0.1H1.6(2). For higher Fe contents the hydrogen capacity is decreased. The absorption kinetics are fast and the reactions are complete within minutes when the alloys are exposed to 20 bar H2 at room temperature. Increasing Fe content reduces the desorption enthalpy, onset temperature and activation energy.

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Section: Thermal Analysis and Sieverts Measurementssupporting

confidence: 88%

The Influence of Fe on the Structure and Hydrogen Sorption Properties of Ti-V-Based Metal Hydrides

et al. 2020

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“…The density of phase boundaries also promotes the formation of coherent and catalytic interfaces at the boundaries, improving hydrogen absorption [13]. Many reports in the area of thermal annealing and partially compositional substitution are available [14][15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ti/Cr content on the microstructures and hydrogen storage properties of Laves phase-related body-centered-cubic solid solution alloys

Young¹,

Wong

Wang³

2015

Journal of Alloys and Compounds

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a b s t r a c tA series of BCC/C14 mixed phase alloys with the chemical composition of Ti 13.6+x Zr 2.1 V 44 Cr 13.2Àx Mn 6.9 Fe 2.7 Co 1.4 Ni 15.7 Al 0.3 , x = 0, 2, 4, 6, 8, 10, and 12, was fabricated, and their structural, gaseous phase and electrochemical hydrogen storage properties were studied. Raising the maximum pressure for measuring the gaseous hydrogen storage capacity allowed these alloys to reach full activation, and the maximum discharge capacities ranged from 375 to 463 mA h g À1 . As the Ti/Cr ratio in the alloy composition increased, the maximum gaseous hydrogen storage capacity improved due to the expansion in both BCC and C14 unit cells. However, reversibility decreased due to the higher stability of the hydride phase, as indicated by the lower equilibrium pressures measured for these alloys. As with most other metal hydride alloys, the electrochemical capacities measured at 50 and 4 mA g À1 fell between the boundaries set by the maximum and reversible gaseous hydrogen storage capacities. The poorer high-rate dischargeability observed with higher Ti/Cr ratios was attributed to the lower surface exchange current (less catalytic). Two other negative impacts observed with higher Ti/Cr ratios in the alloy composition are poorer cycle stability and lower open-circuit voltage.

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“…V-Ti-based hydrogen storage alloys are considered to be one of the excellent hydrogen storage materials due to their large hydrogen absorption capacity compared with AB 5 /AB 2 /AB-typed hydrogen storage alloys [1][2][3][4][5]. However, the industrial applications of V-Ti-based hydrogen storage alloys were restricted due to poor kinetic characteristics, low hydrogen desorption capacity at room temperature and high costs [6][7][8][9]. The effective method of reducing their costs and improving the hydrogen storage properties is the addition of Cr and Fe elements into the V-Ti-based alloys [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and hydrogen storage properties of V40Ti20Cr32Fe8 alloy by heat treatment

Rong¹,

Fu²,

Wang³

et al. 2016

Proceedings of the 2016 International Conference on Innovative Material Science and Technology (IMST 2016)

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The microstructure, crystal structure, hydrogen storage properties and thermal stabilities of as-cast and annealed V40Ti20Cr32Fe8 alloy prepared by arc-melting were studied in this work. It was confirmed that both as-cast and annealed (973 K/72 hrs) V40Ti20Cr32Fe8 alloys are body-centered cubic (bcc) main phase and C14-typed Laves secondary (Cr2Ti). Experimetnal results show that the maximum hydrogen absorption capacities of as-cast V40Ti20Cr32Fe8 alloy at 303 K, 333 K and 363 K are about 2.25 wt.%, 1.75 wt.% and 1.12 wt.%, while that of the annealed alloy at 303 K, 333 K and 363 K are about 2.26 wt.%, 1.76 wt.% and 1.26 wt.%, respectively. The maximum hydrogen desorption capacities of as-cast V40Ti20Cr32Fe8 alloy at 303 K, 333 K and 363 K are about 1.15 wt.%, 0.89 wt.% and 0.60 wt.%, while that of the annealed alloy at 303 K, 333 K and 363 K are about 1.22 wt.%, 0.90 wt.% and 0.61 wt.%, respectively. It is indicated that hydrogen absorption/desorption kinetics of the V-Ti-Cr-Fe alloy is greatly improved by heat treatment.

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Influence of Cr on the hydrogen storage properties of Ti-rich Ti–V–Cr alloys

Cited by 36 publications

References 13 publications

The Influence of Fe on the Structure and Hydrogen Sorption Properties of Ti-V-Based Metal Hydrides

The Influence of Fe on the Structure and Hydrogen Sorption Properties of Ti-V-Based Metal Hydrides

Effect of Ti/Cr content on the microstructures and hydrogen storage properties of Laves phase-related body-centered-cubic solid solution alloys

Microstructure and hydrogen storage properties of V40Ti20Cr32Fe8 alloy by heat treatment

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