Theoretical model of hydrogen absorption via adsorption using 2-step reaction kinetics

Abstract

We experimentally show that the amount of hydrogen absorption does not follow the Sieverts’ law in the hydrogen absorption process using hydrogen absorption material with membrane surface stress sensor (MSS). For this phenomenon, a theoretical model of the hydrogen absorption process via adsorption was constructed using 2-step reaction kinetics. It can be proved that this theory (1) leads to the same result as the Sieverts’ law and the solubility theory, and (2) that the reaction rate of absorption has a Langmuir-type dependency in that the reaction rate of adsorption is much faster than the one of absorption.