Hydrogen storage properties and phase structures of RMg2Ni (R=La, Ce, Pr, Nd) alloys

Pei, Lichao; Han, Shumin; Wang, Jiasheng; Hu, Lin; Zhao, Xiuchen; Liu, Baozhong

doi:10.1016/j.mseb.2012.08.003

Cited by 26 publications

(14 citation statements)

References 20 publications

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“…The Nd-Mg-Ni ternary compounds are expected to be the hydrogen storage alloys with excellent properties because the uniform composition would leads to in - situ formation of the ultrafine MgH 2 -NdH x -Ni/Mg 2 NiH 4 composites 11 21 26 . From the reported literature and our experimental work, it can be found that there are seven ternary compounds in the Nd-Mg-Ni system: Nd 4 Mg 80 Ni 8 , NdMg 8 Ni, NdMg 5 Ni 27 , NdMg 2 Ni 9 , Nd 2 MgNi 2 28 , NdMgNi 4 29 and NdMg 2 Ni 9 30 . The new compound Nd 4 Mg 80 Ni 8 is selected as the target alloy because of its highest content of Mg among those ternary compounds which indicates the maximum hydrogen capacity.…”

Section: Resultsmentioning

confidence: 69%

“…The treatment of this model avoids the multistep calculation error at multi-temperatures and multi-pressures 50 . up to now, the RPP model has been successfully used in analyzing the H/D kinetics of Mg-Ni alloy 50 51 52 , LaNi 5 -based alloy 9 , Mg-LaNi 5 53 , La 2 Mg 17 -based composites 54 , etc. Therefore, the isothermal H/D kinetics of the Nd 4 Mg 80 Ni 8 are analyzed by fitting the observed curves using the RPP model.…”

Section: Resultsmentioning

confidence: 99%

“…However, the relatively slow kinetics of H/D reaction makes them far from practical application. Extensive efforts have been made to improve the H/D properties of magnesium-based alloys by adopting novel preparation techniques 3 4 to reduce the particles sizes or/and adding catalytic components such as transition metals (Ni 3 , Nb 5 , Ti 6 ) and rare earth elements (RE = La 7 , Ce 8 , Pr 9 , Nd 10 ). The addition of RE into Mg-based hydrogen storage alloys facilitates hydrogen absorption through the formation of rare earth hydrides (REH x ).…”

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confidence: 99%

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Phase Equilibria, Crystal Structure and Hydriding/Dehydriding Mechanism of Nd4Mg80Ni8 Compound

Luo

Zhang

et al. 2015

Sci Rep

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In order to find out the optimal composition of novel Nd-Mg-Ni alloys for hydrogen storage, the isothermal section of Nd-Mg-Ni system at 400 °C is established by examining the equilibrated alloys. A new ternary compound Nd4Mg80Ni8 is discovered in the Mg-rich corner. It has the crystal structure of space group I41/amd with lattice parameters of a = b = 11.2743(1) Å and c = 15.9170(2) Å, characterized by the synchrotron powder X-ray diffraction (SR-PXRD). High-resolution transmission electron microscopy (HR-TEM) is used to investigate the microstructure of Nd4Mg80Ni8 and its hydrogen-induced microstructure evolution. The hydrogenation leads to Nd4Mg80Ni8 decomposing into NdH2.61-MgH2-Mg2NiH0.3 nanocomposites, where the high density phase boundaries provide a great deal of hydrogen atoms diffusion channels and nucleation sites of hydrides, which greatly enhances the hydriding/dehydriding (H/D) properties. The Nd4Mg80Ni8 exhibits a good cycle ability. The kinetic mechanisms of H/D reactions are studied by Real Physical Picture (RPP) model. The rate controlling steps are diffusion for hydriding reaction in the temperature range of 100 ~ 350 °C and surface penetration for dehydriding reaction at 291 ~ 347 °C. In-situ SR-PXRD results reveal the phase transformations of Mg to MgH2 and Mg2Ni to Mg2NiH4 as functions of hydrogen pressure and hydriding time.

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Section: Resultsmentioning

confidence: 69%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Phase Equilibria, Crystal Structure and Hydriding/Dehydriding Mechanism of Nd4Mg80Ni8 Compound

Luo

Zhang

et al. 2015

Sci Rep

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“…Hydrogen as a high density energy carrier has been attached great importance on its clean and inexhaustible properties [1]. The application of hydrogen needs a support from high capacity storage materials, such as MgH 2 , which shows a high hydrogen storage capacity of 7.6 wt.% [2,3].…”

Section: Introductionmentioning

confidence: 99%

Improvement in hydrogen storage properties of MgH₂catalyzed with BaTiO₃additive

Wang

Zhang

Han

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The MgH 2 +20 wt. % BaTiO 3 composites is prepared by ball milling MgH 2 with 20 wt. % BaTiO 3 , and the effect of BaTiO 3 on the hydrogen storage properties of the MgH 2 is investigated. TPD (Temperature-programmed-desorption) results showed that with addition of BaTiO 3 , the onset dehydrogenation temperature of the composite is 270 o C, which is 149 º C lower than that of pure MgH 2 . And the hydrogen absorption / desorption rates of MgH 2 + 20 wt.% BaTiO 3 are 2.21 times and 2.12 times of pure MgH 2 at certain temperatures and hydrogen pressures, respectively. Furthermore, BaTiO 3 additives decreased the dehydriding activation energy of MgH 2 from 116 kJ /mol to 108 kJ /mol. BaTiO 3 plays an effective catalyst role in the hydrogenation / dehydrogenation process of MgH 2 .

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“…In recent years, new energy resources have been eagerly sought because fossil fuels are being gradually exhausted and their combustion products pollute our environment [1][2]. Hydrogen, with the advantages of not being a pollutant or generating pollutants through combustion, having a high energy density, and being naturally abundant, is considered an ideal energy carrier [3][4].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen storage properties of MgH2 co-catalyzed by LaH3 and NbH

Song

Zhao

et al. 2017

Int J Miner Metall Mater

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Abstract:To improve the hydrogen storage properties of Mg-based alloys, a composite material of MgH 2 + 10wt%LaH 3 + 10wt%NbH was prepared by a mechanical milling method. The composite exhibited favorable hydrogen desorption properties, releasing 0.67wt% H 2 within 20 min at 548 K, which was ascribed to the co-catalytic effect of LaH 3 and NbH upon dehydriding of MgH 2 . By contrast, pure MgH 2 , an MgH 2 + 20wt%LaH 3 composite, and an MgH 2 + 20wt%NbH composite only released 0.1wt%, 0.28wt%, and 0.57wt% H 2 , respectively, under the same conditions. Analyses by X-ray diffraction and scanning electron microscopy showed that the composite particle size was small. Energy-dispersive X-ray spectroscopic mapping demonstrated that La and Nb were distributed homogeneously in the matrix. Differential thermal analysis revealed that the dehydriding peak temperature of the MgH 2 + 10wt%LaH 3 + 10wt%NbH composite was 595.03 K, which was 94.26 K lower than that of pure MgH 2 . The introduction of LaH 3 and NbH was beneficial to the hydrogen storage performance of MgH 2 .

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Hydrogen storage properties and phase structures of RMg2Ni (R=La, Ce, Pr, Nd) alloys

Cited by 26 publications

References 20 publications

Phase Equilibria, Crystal Structure and Hydriding/Dehydriding Mechanism of Nd4Mg80Ni8 Compound

Phase Equilibria, Crystal Structure and Hydriding/Dehydriding Mechanism of Nd4Mg80Ni8 Compound

Improvement in hydrogen storage properties of MgH₂catalyzed with BaTiO₃additive

Hydrogen storage properties of MgH2 co-catalyzed by LaH3 and NbH

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Hydrogen storage properties and phase structures of RMg2Ni (R=La, Ce, Pr, Nd) alloys

Cited by 26 publications

References 20 publications

Phase Equilibria, Crystal Structure and Hydriding/Dehydriding Mechanism of Nd4Mg80Ni8 Compound

Phase Equilibria, Crystal Structure and Hydriding/Dehydriding Mechanism of Nd4Mg80Ni8 Compound

Improvement in hydrogen storage properties of MgH2catalyzed with BaTiO3additive

Hydrogen storage properties of MgH2 co-catalyzed by LaH3 and NbH

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Improvement in hydrogen storage properties of MgH₂catalyzed with BaTiO₃additive