Kinetics of hydrogen absorption in Ho1−xMmxCo2 alloys

Gadipelli, Srinivas; Sankaranarayanan, V.; Ramaprabhu, Sundara

doi:10.1016/j.jallcom.2006.10.064

Cited by 25 publications

(10 citation statements)

References 39 publications

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“…To investigate the catalytic action of the addition of (Ni-TiO 2 )/rGO on the hydrogenation/dehydrogenation of MgH 2 , the apparent activation energy (E a ) is employed to the hydrogenation/dehydrogenation process, which is calculated by using the Johnson-Mehl-Avrami (JMA) equation. For the JMA model, it can be described as follows (Srinivas et al, 2008;Muthukumar et al, 2009):…”

Section: Resultsmentioning

confidence: 99%

Enhanced Hydrogen Storage Properties of MgH2 Using a Ni and TiO2 Co-Doped Reduced Graphene Oxide Nanocomposite as a Catalyst

et al. 2020

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To improve the hydrogen storage properties of Mg/MgH 2 , a Ni and TiO 2 co-doped reduced graphene oxide [(Ni-TiO 2)@rGO] nanocomposite is synthesized by a facile impregnation method and introduced into Mg via ball milling. The results demonstrated that the dispersive distribution of Ni and TiO 2 with a particle size of 20-200 nm in the reduced graphene oxide matrix led to superior catalytic effects on the hydrogen storage properties of Mg-(Ni-TiO 2)@rGO. The initial hydrogenation/dehydrogenation temperature for Mg-(Ni-TiO 2)@rGO decreased to 323/479 K, 75/84 K lower than that of the additive-free sample. The hydrogen desorption capacity of the Mg-(Ni-TiO 2)@rGO composite released 1.47 wt.% within 120 min at 498 K. When the temperature was increased to 523 K, the hydrogen desorption capacity increased to 4.30 wt.% within 30 min. A hydrogenation/dehydrogenation apparent activation energy of 47.0/99.3 kJ•mol −1 was obtained for the Mg-(Ni-TiO 2)@rGO composite. The improvement in hydrogenation and dehydrogenation for the Mg-(Ni-TiO 2)@rGO composite was due to the reduction of the apparent activation energy by the catalytic action of (Ni-TiO 2)@rGO.

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Section: Resultsmentioning

confidence: 99%

Enhanced Hydrogen Storage Properties of MgH2 Using a Ni and TiO2 Co-Doped Reduced Graphene Oxide Nanocomposite as a Catalyst

et al. 2020

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“…They studied the diffusion coefficient of the H interstitials for all three samples from the kinetics of H 2 gas absorption and found that the pressure decrease described the amount of H 2 gas absorbed by the respective alloy. For an absorption process controlled by bulk diffusion in a spherical sample with radius (R), the reacted fraction (x) is obtained from the ratio x ¼ (P À P (t) )/(P À P N ), where P is the initial pressure of the reaction, P (t) and P N are the pressures at time t and final equilibrium, respectively [18]. Jander model and Chou model will be used below to analyze some experiment values from the literature [11,12].…”

Section: Resultsmentioning

confidence: 99%

A comparative study on the hydriding kinetics of Zr-based AB2 hydrogen storage alloys

Cui

Chou

et al. 2008

Intermetallics

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“…The relationship between the pressure (P), metal hydride concentration (C), and temperature (T) defines the intrinsic reaction kinetics [58,59] and the performance of metal hydride cooling systems [2,28]. Therefore, an accurate modelling of the P-C-T correlation is a key aspect in any metal hydride system.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Modelling and analysis of a metal hydride cooling system

Herrero¹

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The work which is presented by J. Payá Herrero, titled "Modelling and analysis of a metal hydride cooling system" has been carried out at the Institute for Energy Engineering under my supervision and assessment.As the modelling and experimental objectives have been reached, I authorise the submission of this PhD work for its evaluation by the corresponding examination board. This PhD thesis consists in the modelling and validation of a metal hydride cooling system. The experimental prototype is located in the institute IKE.In the first place, the hydrogen absorbing materials have been characterized in terms of the static P-C-T properties and of the intrinsic reaction kinetics. In the second place, after this first characterization phase, a completely dynamic model has been developed based on the heat and mass transfer processes which take place in the reactors. The results have been validated with an exhaustive experimental campaign of dynamic cooling tests and the adjustment of the model is very good.Finally, the cooling performance of the system has been improved by means of the model which has enabled the optimization of the operating conditions and of the sorption materials. El presente estudio consiste en el modelado y validación de un sistema de producción de frío basado en la absorción/desorción de hidrógeno en metales.La instalación experimental que se ha modelado se halla en el instituto IKE.En primer lugar, los materiales utilizados se han caracterizado tanto desde el punto de vista de las curvas P-C-T de equilibrio como de la cinética de absorción/desorción de cada aleación. En segundo lugar, se ha desarrollado un modelo completamente dinámico basado en las reacciones de transferencia de calor y masa que ocurren en los reactores. Los resultados se han validado con una amplia gama de medidas de IKE en régimen transitorio, obteniendo un ajuste muy bueno para diferentes ensayos.Finalmente, mediante la utilización del modelo, se han optimizado las condiciones de operación y las propiedades de los materiales, alcanzando así mejores prestaciones en refrigeración.

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Kinetics of hydrogen absorption in Ho1−xMmxCo2 alloys

Cited by 25 publications

References 39 publications

Enhanced Hydrogen Storage Properties of MgH2 Using a Ni and TiO2 Co-Doped Reduced Graphene Oxide Nanocomposite as a Catalyst

Enhanced Hydrogen Storage Properties of MgH2 Using a Ni and TiO2 Co-Doped Reduced Graphene Oxide Nanocomposite as a Catalyst

A comparative study on the hydriding kinetics of Zr-based AB2 hydrogen storage alloys

Modelling and analysis of a metal hydride cooling system

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