Microstructure and hydrogenation behavior of ball-milled and melt-spun Mg–10Ni–2Mm alloys

Wu, Ying; Han, Wei; Zhou, Shaoxiong; Lototsky, M.V.; Solberg, Jan Ketil; Yartys, V.A.

doi:10.1016/j.jallcom.2007.11.128

Cited by 155 publications

(44 citation statements)

References 17 publications

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“…During MA, the powder particles which are trapped between the colliding balls are subjected to compressive impact forces. Thus, they are deformed, fractured and cold-welded leading to defects in the system and also an average particle size reduction [19]. As mentioned before, the discharge capacity of LaCaMgNi 9 alloy could reach 360 mAh/g [7] while the maximum discharge capacity obtained in this work is 156 mAh/g of active material (146.2 mAh/g of sample S20) after 20 h of MA.…”

Section: Electrochemical Characterizationssupporting

confidence: 49%

Electrochemical characterization of mechanically alloyed LaCaMgNi9 compound

Chebab¹,

Abdellaoui²,

Latroche

et al. 2016

Mater Renew Sustain Energy

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The performance of a nickel-metal hydride (Ni-MH) battery mainly depends on the characteristics of the negative electrode. The electrochemical characteristics of mechanically alloyed compound LaCaMgNi 9 , including the discharge capacity and the hydrogen diffusion coefficient, were studied as function of mechanical alloying (MA) conditions. The electrochemical measurements show that the LaCaMgNi 9 electrode has a maximum discharge capacity of about 150 mAh/g at a discharge rate of C/3. The hydrogen discharge capacity dramatically decreases as MA duration exceeds 20 h.

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Section: Electrochemical Characterizationssupporting

confidence: 49%

Electrochemical characterization of mechanically alloyed LaCaMgNi9 compound

Chebab¹,

Abdellaoui²,

Latroche

et al. 2016

Mater Renew Sustain Energy

View full text Add to dashboard Cite

show abstract

“…In the RS2000 alloy, the smallest particle sizes were observed (using TEM), and this correlates with advantageous hydrogenation behaviours of the material. The highest hydrogenation rate was observed for materials which were solidified with the highest cooling rate [56,57].…”

Section: Rapid Solidificationmentioning

confidence: 98%

“…For the Mg-rich alloys with rare earth metals (mischmetal) and nickel, the conditions of RS strongly influence the particle size of the formed particles, spanning a broad range of sizes, from 50 nm to 1 lm. The most detailed studies were performed for the La(Mm)NiMg alloys obtained by RS at different cooling rates, RS300, RS1000 and RS2000 (corresponding to surface velocity 3.1, 10.5 and 20.9 m/s) [56][57][58]. The hydrogenation properties of the alloys appear to be strongly related to the solidification rate/nanostructuring.…”

Section: Rapid Solidificationmentioning

confidence: 99%

Review of magnesium hydride-based materials: development and optimisation

et al. 2016

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Magnesium hydride has been studied extensively for applications as a hydrogen storage material owing to the favourable cost and high gravimetric and volumetric hydrogen densities. However, its high enthalpy of decomposition necessitates high working temperatures for hydrogen desorption while the slow rates for some processes such as hydrogen diffusion through the bulk create challenges for large-scale implementation. The present paper reviews fundamentals of the Mg-H system and looks at the recent advances in the optimisation of magnesium hydride as a hydrogen storage material through the use of catalytic additives, incorporation of defects and an understanding of the rate-limiting processes during absorption and desorption.

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“…Zaluski et al [33] and Orimo et al [34] validated that the hydriding/dehydriding kinetics of the milled nanocrystalline Mg2Ni alloys at low temperatures (lower than 200 °C) can be improved by reducing the grain size, due to the fact that hydrogen atoms mainly occupied in the disordered interface phase and the grain boundary. It has come to light clearly that high rate discharge ability (HRD) is basically dominated by the hydrogen diffusion process from the interior of the bulk to the surface of alloy particle and the charge transfer at the alloy-electrolyte interface [35]. The hydrogen diffusion coefficients in the as-cast and spun alloys were measured using the potential step technique.…”

Section: Gaseous and Electrochemical Hydriding And Dehydriding Kineticsmentioning

confidence: 99%