Microstructure and tailoring hydrogenation performance of Y-doped Mg2Ni alloys

Song, Wenjie; Li, Jinshan; Zhang, Tiebang; Kou, Hongchao; Xue, Xu

doi:10.1016/j.jpowsour.2013.07.049

Cited by 38 publications

(17 citation statements)

References 42 publications

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“…However, a fully reversible Mg(In)-H 2 system with a low DH d value (67.8 kJ mol À1 H 2 ) was realized recently through a reaction between MgH 2 and b-MgIn phases. In view of the high catalytic activity of Mg-based compounds in hydrogen sorption by pure Mg, [20][21][22][23][24] we used Mg 5.7 In 0.3 Ag, a magnesium-rich alloy containing Mg 3 Ag and Mg phases in the present work to reveal the inuence of In on the hydrogen storage thermodynamics of Mg 3 Ag and to examine the catalytic activity of Mg-Ag compounds in the presence of additional MgH 2 . 18,19 It is therefore of interest to determine whether dissolution of indium in Mg 3 Ag can further improve the thermodynamics of the Mg 3 Ag-H 2 system.…”

Section: Introductionmentioning

confidence: 99%

Enhanced hydrogen storage properties of a Mg–Ag alloy with solid dissolution of indium: a comparative study

Cao

Zhang

et al. 2015

J. Mater. Chem. A

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A comparative study of Mg 5.7 In 0.3 Ag and Mg 6 Ag alloys was conducted to reveal the effects of indium (In) solid solutions on the hydrogen storage properties of Mg-based alloys. Different from the Mg 6 Ag alloy, the as-cast Mg 5.7 In 0.3 Ag alloy was composed of a Mg(In) solid solution and Mg 3 Ag. However, an initial hydrogen absorption/desorption treatment (i.e., activation) propelled the In atoms in Mg(In) toward Mg 3 Ag, forming (Mg, In) 3 Ag in the activated sample. This transformation involving the dissolution of In atoms from Mg into solid Mg 3 Ag not only greatly improved the thermodynamics of hydrogen desorption but also enhanced its catalytic effect on hydrogen desorption from additional MgH 2 . The (Mg, In) 3 Ag-H 2 system exhibited altered thermodynamics, as its enthalpy change of the hydrogen desorption was 62.6 kJ mol À1 H 2 . Moreover, the activation energy of the hydrogen desorption from the Mg 5.7 In 0.3 Ag sample was lowered to 78.2 kJ mol À1 .

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Section: Introductionmentioning

confidence: 99%

Enhanced hydrogen storage properties of a Mg–Ag alloy with solid dissolution of indium: a comparative study

Cao

Zhang

et al. 2015

J. Mater. Chem. A

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“…Yttrium oxides have important applications in the eld of catalysts, reproong, electrode materials, and magnetic materials, [1][2][3][4][5][6][7][8][9][10][11] and they are especially used as doping agents for catalyst supports and catalysts. [8][9][10][11] For instance, yttria-doped alumina is more thermally stable than bare alumina and can be used as a catalyst support for the thermo-catalytic cracking process.…”

Section: Introductionmentioning

confidence: 99%

Structural evolution, sequential oxidation and chemical bonding in tri-yttrium oxide clusters: Y₃O_x⁻ and Y₃O_x (x = 0–6)

Xia

Wang

et al. 2014

RSC Adv.

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We report a systematic and comprehensive investigation on the electronic structures and chemical bonding of a series of tri-yttrium oxide clusters,using density functional theory (DFT) calculations. Generalized Koopmans' theorem is applied to predict the vertical detachment energies (VDEs) and simulate the photoelectron spectra (PES) for Y 3 O x − (x = 0−6) clusters. A trend of sequential oxidation is observed from Y 3 O − to Y 3 O 6 − . All of these clusters tend to form the structures with a capped oxygen atom. For Y 3 O x −/0 (x = 2−4), the O atoms are shown to prefer the bridging sites of Y 3 O −/0 , whereas the fifth O atoms for Y 3 O 5 −/0 are bonded to the terminal sites. As for the oxygen-rich clusters Y 3 O 6 − and Y 3 O 6 , O 2 2− and O 2 −• units occur which can be regarded as the products reduced dioxygen by Y 3 O 4 − and Y 3 O 4 , respectively. σ-and π-aromaticity is found in Y 3 − by molecular orbital analysis and Adaptive Natural Density Partitioning (AdNDP) analysis. Molecular orbitalanalyses are performed to analyze the chemical bonding in the tri-yttrium oxide clusters and to elucidate their electronic and structural evolution.

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“…The Mg 67 Ni 23 Y 10 alloy was melted and furnace cooled under the protection of covering agent in the resistance furnace [9]. The chemical constituents and structure of MgYNi 4 phase were characterized by EPMA and X-ray diffraction (XRD).…”

Section: Methodsmentioning

confidence: 99%

Formation mechanism of tetrahedral MgYNi4 phase

Song

Zhang

et al. 2015

Materials Letters

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Microstructure and tailoring hydrogenation performance of Y-doped Mg2Ni alloys

Cited by 38 publications

References 42 publications

Enhanced hydrogen storage properties of a Mg–Ag alloy with solid dissolution of indium: a comparative study

Enhanced hydrogen storage properties of a Mg–Ag alloy with solid dissolution of indium: a comparative study

Structural evolution, sequential oxidation and chemical bonding in tri-yttrium oxide clusters: Y₃O_x⁻ and Y₃O_x (x = 0–6)

Formation mechanism of tetrahedral MgYNi4 phase

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Microstructure and tailoring hydrogenation performance of Y-doped Mg2Ni alloys

Cited by 38 publications

References 42 publications

Enhanced hydrogen storage properties of a Mg–Ag alloy with solid dissolution of indium: a comparative study

Enhanced hydrogen storage properties of a Mg–Ag alloy with solid dissolution of indium: a comparative study

Structural evolution, sequential oxidation and chemical bonding in tri-yttrium oxide clusters: Y3Ox− and Y3Ox (x = 0–6)

Formation mechanism of tetrahedral MgYNi4 phase

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Structural evolution, sequential oxidation and chemical bonding in tri-yttrium oxide clusters: Y₃O_x⁻ and Y₃O_x (x = 0–6)