Effect of nanosized oxides on MgH2 (de)hydriding kinetics

Aguey-Zinsou, Kondo Francois; Nicolaisen, T.; Ares, J.R.; Klassen, Thomas; Bormann, R.

doi:10.1016/j.jallcom.2006.08.137

Cited by 61 publications

(42 citation statements)

References 11 publications

(12 reference statements)

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“…It may plausibly be suggested that, during high energy ball milling experiments, the reduction of V 2 O 5 ͑phase transformation͒ can occur, yielding MgO and metallic V. 28 This, however, could be difficult to detect due to the low addition levels of V 2 O 5 . Motivated by our previous theoretical studies on catalytic effects of Ti and Pd dopants on a Mg surface, 13,14 as well as more recent work on Ni, 29 we have explored the possible role of V dopants in facilitating the surface dissociation of H 2 on the Mg͑0001͒ surface.…”

mentioning

confidence: 99%

The role of V2O5 on the dehydrogenation and hydrogenation in magnesium hydride: An ab initio study

Smith

Yao

et al. 2008

Applied Physics Letters

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mentioning

confidence: 99%

The role of V2O5 on the dehydrogenation and hydrogenation in magnesium hydride: An ab initio study

Smith

Yao

et al. 2008

Applied Physics Letters

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“…We also found that upon Nb 2 O 5 addition to MgH 2 during the milling process a significant improvement of the grinding process was achieved [44]. Taking into account the poor ability of metal oxides such as SiO 2 to enhance the hydrogen kinetics of Mg [45], and considering the mechanical effect of metal oxides in facilitating the grinding and stabilisation of small MgH 2 particles a correlation was found between the potency of a metal oxide in improving hydrogen kinetics in Mg and the nature of the metal-oxygen bond ( Figure 6). Depending on the electronegativity of solid oxides envisaged lower hydrogen desorption temperatures were obtained for oxides of higher electronegativity such as MgO.…”

Section: Rationalisation Of the Effect Of Oxidesmentioning

confidence: 65%

“…In our early investigations, we have reported that non transition metal oxides such as Al 2 O 3 were also good at improving the hydrogen kinetics of Mg/MgH 2 [45]. We also found that upon Nb 2 O 5 addition to MgH 2 during the milling process a significant improvement of the grinding process was achieved [44].…”

Section: Rationalisation Of the Effect Of Oxidesmentioning

confidence: 84%

Superior MgH2 Kinetics with MgO Addition: A Tribological Effect

Ares-Fernández

Aguey‐Zinsou

2012

Catalysts

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Abstract:The kinetics of hydrogen absorption/desorption in magnesium can be improved without any catalysis assistance and MgO was found to be more effective than the best catalyst reported so far, i.e., Nb 2 O 5 . Herein, a quantitative analysis of the hydrogen kinetics in magnesium modified with MgO was performed in order to identify possible rate controlling mechanisms. While hydrogen absorption was found to be diffusion controlled as commonly reported, hydrogen desorption evolved from nucleation and growth to an interface controlled process depending on the desorption temperature. Comparison with the effect of Nb 2 O 5 indicates that similar rate limiting steps occur regardless of the oxide additive. These findings are reconciled by considering the tribological effect of solid oxide additives, as a correlation between oxides electronegativity and improvement in hydrogen kinetics was found. Such a correlation clearly highlights the mechanical effect of solid oxides in facilitating the grinding and stabilisation of small magnesium particles for efficient and fast hydrogen kinetics.

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“…The kinetics of H2 sorption in pure Mg are generally very poor [40] due to the slow hydrogen diffusion through the initial MgH2 layer that forms on the outer surface of the particle. However, the kinetic issues have recently been overcome by introducing additives during ball milling [21,41,42] that help to promote microstructure refinement of Mg/MgH2 and reduce H2 diffusion lengths. However, above 380 °C the effect of the additive can become limited due to sintering of Mg or the reduction of oxides by Mg to form MgO that impedes the transport of hydrogen [43].…”

Section: Ionic Hydridesmentioning

confidence: 99%

Metal hydrides for concentrating solar thermal power energy storage

et al. 2016

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The development of alternative methods for thermal energy storage is important for improving the efficiency and decreasing the cost for Concentrating Solarthermal Power (CSP). We focus on the underlying technology that allows metal hydrides to function as Thermal Energy Storage (TES) systems and highlight the current state-of-the-art materials that can operate at temperatures as low as room-temperature and as high as 1100 o C. The potential of metal hydrides for thermal storage is explored while current knowledge gaps about hydride properties, such as hydride thermodynamics, intrinsic kinetics and cyclic stability, are identified. The engineering challenges associated with utilising metal hydrides for high-temperature thermal energy storage are also addressed.

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Effect of nanosized oxides on MgH2 (de)hydriding kinetics

Cited by 61 publications

References 11 publications

The role of V2O5 on the dehydrogenation and hydrogenation in magnesium hydride: An ab initio study

The role of V2O5 on the dehydrogenation and hydrogenation in magnesium hydride: An ab initio study

Superior MgH2 Kinetics with MgO Addition: A Tribological Effect

Metal hydrides for concentrating solar thermal power energy storage

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