Influence of Specific Surface Area of Powder on Hydrogen Desorption Kinetics for Metal Hydrides

TL;DR

This study models how the specific surface area of powder influences hydrogen desorption kinetics in metal hydrides, validated with magnesium hydride experiments, offering a general approach for analyzing desorption processes.

Contribution

The paper introduces a model linking powder surface area to desorption kinetics, validated with experimental data on magnesium hydride, applicable to various metal hydrides.

Findings

Model accurately reproduces experimental desorption curves

Specific surface area significantly affects desorption kinetics

Volumetric measurement approach is broadly applicable

Abstract

The observable results for desorption kinetics by powder of metal hydride on the example of mangesium hydride are reproduced with the model formulated in terms of specific surface of powder. A volumetric measurement of hydrogen desorption process is evaluated on an example of wet ball milled magnesium hydride, and can be applied generally for any metal hydride. The exact solution of the model reproduces the shape of experimental curves for desorption process providing a satisfying agreement with experimental data.