Kinetics of Final Degassing of Hydrogen Desorption by Metal Hydrides

TL;DR

This paper presents an analytical model for hydrogen desorption kinetics in metal hydrides, specifically after the complete decay of the hydride phase, demonstrated with magnesium hydride.

Contribution

It introduces an exact analytical solution for the final degassing stage in metal hydrides, expanding understanding of hydrogen release mechanisms.

Findings

Analytical solution accurately describes hydrogen desorption kinetics.

Model validated with magnesium hydride data.

Provides insights into the final stage of hydrogen release.

Abstract

The proposed model concerns the 'confluent shrinking core' scenario and reproduces the desorption kinetic after the complete decay of the stoichiometric hydride ($\beta$-phase). The exact analytical solution is obtained, the numerical values are demonstrated by the example of magnesium hydride.