Particle size effects on the desorption properties of nanostructured magnesium dihydride (MgH2) synthesized by controlled reactive mechanical milling (CRMM)

Varin, R.A.; Czujko, Tomasz; Chiu, Chun; Wronski, Zbigniew S.

doi:10.1016/j.jallcom.2005.12.087

Cited by 135 publications

(118 citation statements)

References 16 publications

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“…Apparently, this result shows that there is no influence of additive type on crystallite size reduction of β-MgH 2 , with the milling conditions used here. Nanograin sizes of β-MgH 2 phase, in the same range were observed in the reference 21 when the Mg was ball milled under hydrogen atmosphere. Figure 3a shows the DSC curves for Mg pure and Mg-based nanocomposites containing 2.5, 5.0 and 7.5 mol% of TiCrV and 2.5, 5.0 mol% of TiCr 1.2 V 0.8 .…”

Section: Methodssupporting

confidence: 75%

Mg-based Nanocomposites for Hydrogen Storage Containing Ti-Cr-V Alloys as Additives

et al. 2016

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In this study, we have investigated the synthesis, microstructure and hydrogen storage properties of Mg-based nanocomposites containing different concentrations of TiCrV and TiCr 1.2 V 0.8 alloys. The Mg-based nanocomposites of Mg containing Ti-Cr-V additives were prepared by reactive milling (RM) under hydrogen atmosphere. The structural characterization revealed the presence of the β-MgH 2 , γ-MgH 2 and BCC phases in the powders samples after RM. In addition, a very refined and homogenous microstructure with average MgH 2 crystallite size of around 10-12 nm was observed, including a nanometric dispersion of the additives in the magnesium hydride matrix. The doping with TiCrV and TiCr 1,2 V 0,8 greatly improves the hydrogen desorption behavior of Mg in comparison with the sample without additive, resulting in the lowest onset temperature (240 °C) for the sample containing 5%mol. of TiCrV. Very fast absorption and desorption kinetics at 275 °C and 300 °C (7 minutes and 5 minutes for full desorption and absorption, respectively) were observed in the samples containing TiCrV and TiCr 1,2 V 0,8 without any notable difference between the type of additive used in comparison with the pure sample. However, a slight reduction in hydrogen capacity is observed in the mixtures than for the pure sample (6.7 wt.% against 7.3 wt.%).

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Section: Methodssupporting

confidence: 75%

Mg-based Nanocomposites for Hydrogen Storage Containing Ti-Cr-V Alloys as Additives

et al. 2016

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“…Tuning the thermodynamics of hydrogen absorption in Mg has so far been achieved by means of proper doping, 2,3 although this generally results in a reduction of the material's storage capacity. Some destabilization upon reduction of the Mg particle size has also been observed experimentally 4 and predicted theoretically. 5,6 In our group, we have recently demonstrated the possibility of tuning the thermodynamics of hydrogen absorption in Mg thin films by means of elastic clamping.…”

mentioning

confidence: 53%

Quasifree Mg–H thin films

Baldi

Palmisano

González-Silveira

et al. 2009

Applied Physics Letters

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The thermodynamics of hydrogen absorption in Pd-capped Mg films are strongly dependent on the magnesium thickness. In the present work, we suppress such dependency by inserting a thin Ti layer between Mg and Pd. By means of optical measurements, we show that the surface energy contribution to the destabilization of MgH 2 is negligible. The inserted Ti layer prevents Mg-Pd alloy formation at the Mg/Pd interface, leading to quasifree Mg films and enhancing the kinetics of hydrogen desorption. Our observations are important for the development of thin film devices.

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“…To improve the storage properties, kinetics and temperature of desorption of magnesium, nano-sized Mg and Mgbased metallic compound powders have been synthesized by ball milling (BM) intensively [3][4][5][6][7][8], however, all attempts to reduce the temperature of dehydrogenation below 150 degrees have failed until now. Nevertheless, other non-equilibrium techniques, such as rapid quenching (RQ) enables the formation of highly metastable structures.…”

Section: Introductionmentioning

confidence: 99%

High glass forming ability correlated with microstructure and hydrogen storage properties of a Mg–Cu–Ag–Y glass

Révész

Kis-Tóth

Varga

et al. 2014

International Journal of Hydrogen Energy

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Particle size effects on the desorption properties of nanostructured magnesium dihydride (MgH2) synthesized by controlled reactive mechanical milling (CRMM)

Cited by 135 publications

References 16 publications

Mg-based Nanocomposites for Hydrogen Storage Containing Ti-Cr-V Alloys as Additives

Mg-based Nanocomposites for Hydrogen Storage Containing Ti-Cr-V Alloys as Additives

Quasifree Mg–H thin films

High glass forming ability correlated with microstructure and hydrogen storage properties of a Mg–Cu–Ag–Y glass

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