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Hydriding kinetics of LaNi5 using Nucleation-growth and Diffusion Models

Hydriding kinetics of LaNi₅ using Nucleation-growth and Diffusion Models

J. Payá^*| A. Freni | J.M. Corberán | V. Compañ

Universidad Politécnica de Valencia, Instituto de Ingeniería Energética, Valencia

C.N.R. – Institute for Advanced Technologies ITAE, Messina

Universidad Politécnica de Valencia, Departamento de Termodinámica Aplicada, Valencia

Corresponding Author Email:

jorpaher@iie.upv.es

Received:

29 December 2011

| |

Accepted:

9 February 2012

| | Citation

v15n04a11_p293-300.pdf

OPEN ACCESS

Abstract:

In this paper, the hydriding kinetics of a LaNi₅alloy have been measured with a thermo-gravimetric system. The rate controlling steps have been analyzed. In the α + β phase, a first order Johnson-Mehl-Avrami model provides a good agreement with the measurements. In the ? phase, the previous approach shows that the reaction becomes progressively controlled by the diffusion of hydrogen atoms through the hydride. In order to support this hypothesis, a Crank-Nicholson diffusion model has also been applied and achieved good results. The results show that the transition in the rate controlling mechanism takes place before the static pressure-composition isotherms are reached.

Keywords:

metal hydride, LaNi_5, kinetics, diffusion model

1. Introduction

2. Experimental

3. Sorption Models

4. Results and Discussion

5. Conclusions

Acknowledgments

The authors gratefully acknowledge Marc Linder from the In-stitüt für Technische Thermodynamik des Deutschen Zentrums für Luft- und Raumfahrt (DLR) for his support.

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Hydriding kinetics of LaNi5 using Nucleation-growth and Diffusion Models