Improvement of hydrogen storage characteristics of Mg/Mg2Ni by alloying: Beneficial effect of In

Čermák, Jan; Král, Lubomír

doi:10.1016/j.jpowsour.2012.04.035

Cited by 23 publications

(13 citation statements)

References 34 publications

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“…These results strongly suggest that Mg and/or Mg 3 Ag formed a solid solution with In. [16][17][18]23 the In atoms dissolved in MgAg to form (Mg, In)Ag, as conrmed by XRD renement. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…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%

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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: Resultsmentioning

confidence: 99%

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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“…In our previous studies [28][29][30][31][32], it was observed that additions of carbon and indium to a Mg-based alloy improved its hydrogen desorption behaviour. It was also shown that the alloy undergoes some ageing/ripening after the initial hydrogen charging [29], which induced a substantial improvement in hydrogen desorption kinetics.…”

Section: Introductionmentioning

confidence: 93%

“…*Phase composition of freshly-prepared Alloy 2 taken from previous studies [28][29][30][31][32]; XRD analysis of freshly prepared Alloy 1 was not done. trons - Fig.…”

Section: Sample Characterizationmentioning

confidence: 99%

Influence of long-term ageing upon the capacity of hydrogen storage in two novel Mg-Ni-In-C alloys

Čermák¹,

Král²,

Roupcová³

2016

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We have shown previously that the addition of In and C enhances the hydrogen desorption capacity and considerably improves the kinetics of hydrogen desorption from Mg-Ni based alloys, important from the perspective of hydrogen storage. In this paper, we present the results of tests of the long-term stability of the sorption behaviour of these materials. We studied how the capacity and sorption kinetics changed 5 years from the preparation of two chosen Mg-Ni-In-C alloys differing in indium concentration. Kinetic curves and PCT isotherms were measured at temperatures of 250-350• C. It was found that long-term storage of the hydrogencharged samples led to no significant downgrade in hydrogen sorption kinetics. However, the absorption capacity somewhat decreased from about 5 wt.% H2 to about 3 wt.% H2 due to partial phase decomposition. Relatively intensive tentative oxidation during preparation, which had a slightly beneficial effect on the desorption rate of freshly-prepared samples, caused almost total blocking of hydrogen sorption in the aged samples.K e y w o r d s : hydrogen, hydrogen storage, magnesium alloys, indium

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“…Magnesium (Mg) and its alloys are perspective lightweight materials [1] that are widely used in biomedical [2] and energy storage applications [3,4]. It crystallizes in hexagonal close packed (hcp) lattice and, similarly to other hcp materials, its plastic deformation is characterized by the presence of a variety of slip and twinning modes [5,6].…”

Section: Introductionmentioning

confidence: 99%

Peierls barriers of a-type edge and screw dislocations moving on basal and prismatic planes in magnesium

Ostapovets

Vatazhuk

2017

Low Temperature Physics

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Exact shape of Peierls barriers are calculated for edge and screw dislocation gliding on basal and prismatic planes in magnesium by using of several popular interatomic potentials. Comparison of these potentials is performed in order to describe their abilities and limitations. Stability of different types of dislocation cores are analyzed as well as their mutual transformations during dislocation slip. It was found that the Peierls stresses and barrier height are dependent on core type. It was concluded that transformations of dislocation cores along minimal energy paths have to be taken into account for development of analytical models of the slip in magnesium. The results are compared with available first-principles calculations.

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Improvement of hydrogen storage characteristics of Mg/Mg2Ni by alloying: Beneficial effect of In

Cited by 23 publications

References 34 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

Influence of long-term ageing upon the capacity of hydrogen storage in two novel Mg-Ni-In-C alloys

Peierls barriers of a-type edge and screw dislocations moving on basal and prismatic planes in magnesium

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