Structure and hydrogen absorbing properties of ScCrMn alloy

Li, Wuhui; Wu, E.

doi:10.1016/j.jallcom.2011.09.023

Cited by 5 publications

(6 citation statements)

References 21 publications

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“…The size of the crystal indicates that the alloys do not pulverize significantly after hydrogenation and is consistent with the relatively narrow peaks observed in the XRD patterns. The appearance of the unexpected faint alternate spots associated to the (001) planes in the diffraction patterns of (b) and (c) can be attributed to the dynamical scattering events due to the thick specimen . This characteristic can be used to determine the corresponding (002) plane in the Laves phase structure.…”

Section: Resultsmentioning

confidence: 92%

“…As Sc is much lighter than lanthanides, the advance of the Sc substituted alloys in hydrogen storage could therefore drive the development of the hydrogen storage alloys and outpace lanthanides in the relevant applications in the future. In our recent studies of the Ti 1− x Sc x MnCr alloys, in particular the Sc‐rich alloy of ScMnCr , we found that the Cr–Mn upon alloying with lower valence metal of Sc are highly beneficial to the catalysis process of hydrogen dissociation, so that extraordinary hydrogen activation properties comparable to that of Pd metal are exhibited by these alloys. Since the Sc metal is still quite expensive, and only minor addition of Sc in the alloy would have practical significance for hydrogen storage applications, we have therefore systematically studied the hydrogen storage properties of the Ti 1− x Sc x MnCr alloys with substitution of low Sc contents (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen storage properties of Ti_1−xSc_xMnCr Laves phase alloys

et al. 2012

Int. J. Energy Res.

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SUMMARY The hydrogen storage properties of Ti1−xScxMnCr (x = 0.05, 0.10, 0.15, 0.22, 0.27 and 0.32) alloys are studied by pressure‐composition isotherms at 0–60 °C and 1 kPa–4 MPa. The relevant crystal structures of the alloys and their hydrides are examined by the X‐ray diffraction and electron microscopy. The alloys are basically C14 type Laves phase with slightly different lattice parameters owing to the difference in composition. Except for x = 0.05 alloy, the bulk samples of these alloys can be easily activated under ambient conditions and attain the maximum hydrogen storage capacities during the initial hydrogenation. As Sc content increases, the hydrogen storage capacity of the alloy increases whereas the pressure of the absorption/desorption plateau decreases. No hydrogen‐induced disproportionation is observed, and the hydrogen‐induced defects and pulverization are not severe after hydriding/dehydriding cycles of these alloys. The Ti0.78Sc0.22MnCr alloy exhibits the best reversible hydrogen storage capacity of ~2 wt% in between 1 and 4000 kPa at room temperature. Except for the x = 0.32 alloy, the average thermodynamic values of |ΔH| and |ΔS| in the system increase approximately linearly with Sc content in the alloys. The thermogravimetry‐differential scanning calorimetry (TG‐DSC) on desorption of the hydride of Ti0.68Sc0.32MnCr indicates that the thorough release of hydrogen in the alloy can be achieved at 658 K. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Hydrogen storage properties of Ti_1−xSc_xMnCr Laves phase alloys

et al. 2012

Int. J. Energy Res.

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“…AB 2 ‐type alloys include Zr‐based (ZrCr 2 , ZrFe 2 , ZrMn 2 , ZrV 2 ), Ti‐based (Ti‐Cr and Ti‐Mn based), and RE‐based (RE: Rare earth metal) alloys. Among AB 2 ‐type alloys, the hydrogen desorption plateau pressure of ZrCr 2 , ZrMn 2 , ZrV 2 , TiMn 1.5 , and RE‐based alloys are all lower than 1 MPa at room temperature. Although Zr‐Fe based alloys have the higher hydrogen desorption plateau pressures, but the hydrogen storage capacities are relatively small due to the heavy atomic weight of Zr .…”

Section: Introductionmentioning

confidence: 97%

High‐pressure hydrogen storage properties of Ti _x Cr _1 − y Fe _y Mn _1.0 alloys

Jiang

et al. 2019

Int J Energy Res

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Summary TixCr1 − yFeyMn1.0 (x = 1.02, 1.05, 1.1, 0.05 ≤ y ≤ 0.25) alloys were prepared by plasma arc melting and annealing at 1273 K for 2 hours. The XRD results show that the main phase of all alloys is the C14 type Laves phase, and a little secondary phase exists in a mixture of the binary alloy phase. The lattice parameters increase with Ti super‐stoichiometry ratio increasing, whereas smaller lattice parameters emerge with increasing Fe stoichiometry content. Additionally, as the Ti super‐stoichiometry ratio decreases, the pressure‐composition‐temperature measurements indicated that hydrogen absorption and desorption plateau pressures of TixCr0.9Fe0.1Mn1.0 (x = 1.1, 1.05, 1.02) alloys increase from 3.15, 0.67, to 5.94, 1.13 MPa at 233 K, respectively. On the other hand, with the Fe content increasing in Ti1.05Cr1 − yFeyMn1.0 (0.1 ≤ y ≤ 0.25) alloys from 0.1 to 0.25, the hydrogen desorption plateau pressures increased from 1.41 to 2.46 MPa at 243 K. The hydrogen desorption plateau slopes reduce to 0.2 with Ti super‐stoichiometry ratio decreasing to 1.02, but the alloys are very difficult to activate for hydrogen absorption and cannot activate when the Fe substituting for Cr exceeds 0.2. The maximum hydrogen storage capacities were more than 1.85 wt% at 201 K. The reversible hydrogen storage capacities can remain more than 1.55 wt% at 271 K. The enthalpy and entropy for all hydride dehydrogenation are in the range of 21.0 to 25.5 kJ/mol H2 and 116 to 122 J mol−1 K−1, respectively. Our results suggest that Ti1.05Cr0.75Fe0.25Mn1.0 alloy with low enthalpy holds great promise for a high hydrogen pressure hybrid tank in a hydrogen refueling station (45 MPa at 333 K), and the other alloys of low cost may be used for a potable hybrid tank due to high dissociation pressure at 243 K and high volumetric density exceeding 40 kg/m3.

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“…ScMn 2 ¨ÞÎÅ ÙÕ ScCrMn ¼ [6] , Ê¨ ¦ÇÊ ÓÒÝ¾, Ï ZrMn2 ¨ ¦ ÓØ (¨2b). ÞÓÛH ¤ È Ho 0.6 Mn 0.4 Co 2 ¨¼ [13] , ScMn…”

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“…´ Ó £ ßAE [16] ¤ Í: AE ² Þ« [1] , Sc Zr Ü H ÅÂ º ÊÚ Å º ¿ . ScMn 2 Ï ÜÇ (18 Pa) Û ScCrMn(0.5 Pa) [6] , ÊÖÛ, Mn § (r Mn =0.179 nm) Cr(r Cr =0.185 nm) , Mn Í ScCrMn ¸ Cr ´ Ö ¨¸ÖÛ…”

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confidence: 99%

HYDROGEN STORAGE PROPERTIES OF ScMn<SUB>2</SUB> ALLOY

李武会¹,

田保红²,

马坪³

et al. 2013

ACTA METALLURGICA SINICA

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ScMn 2 Ð Ú (AE) ¤× * 1)2) 1) 1)ªÎ ¼AE³ØÝ H(D) ÄÐ ¤ , ×Ô ÍÄ Ø; 100 kPa, 298 K , 1 mol ScMn2 § Â ¢ 3.7 3.6 mol; ScMn2 ×Ü ¡ª µ AE¡ Õ, Ô ÛÞ Ü ÛAE, ËÚ H §£ Ç. ÝÎ ÛAEÛ § Ä ΔH ΔS -45 kJ/mol -80 J/(K•mol); ScMn2 ª 113 kPa Ä H2(D2) AEAE³ (Â) Ð Á³Ò JMA , ¤ 0.4, Â ¸ÍÄØ (16±0.3) (19±1.7) kJ/mol, ÀÍÄØ ¹ Â ScMn2 ×³ ØÒÚH £ ; ÝÄ § Ä ª 639 K Ø¬ ª , ª ¸ÍÄØ (144±14) kJ/mol.

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Structure and hydrogen absorbing properties of ScCrMn alloy

Cited by 5 publications

References 21 publications

Hydrogen storage properties of Ti_1−xSc_xMnCr Laves phase alloys

Hydrogen storage properties of Ti_1−xSc_xMnCr Laves phase alloys

High‐pressure hydrogen storage properties of Ti _x Cr _1 − y Fe _y Mn _1.0 alloys

HYDROGEN STORAGE PROPERTIES OF ScMn<SUB>2</SUB> ALLOY

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Structure and hydrogen absorbing properties of ScCrMn alloy

Cited by 5 publications

References 21 publications

Hydrogen storage properties of Ti1−xScxMnCr Laves phase alloys

Hydrogen storage properties of Ti1−xScxMnCr Laves phase alloys

High‐pressure hydrogen storage properties of Ti x Cr 1 − y Fe y Mn 1.0 alloys

HYDROGEN STORAGE PROPERTIES OF ScMn<SUB>2</SUB> ALLOY

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Hydrogen storage properties of Ti_1−xSc_xMnCr Laves phase alloys

Hydrogen storage properties of Ti_1−xSc_xMnCr Laves phase alloys

High‐pressure hydrogen storage properties of Ti _x Cr _1 − y Fe _y Mn _1.0 alloys