Material properties and empirical rate equations for hydrogen sorption reactions in 2 LiNH 2 – 1 . 1 MgH

2 LiNH2 –1.1 MgH2 0.1 LiBH4 3 wt.% ZrCoH3 is a promising solid state hydrogen storage material with a hydrogen storage capacity of up to 5.3 wt.%. As the material shows sufficiently fast desorption rates at temperatures below 200 °C, it is used for a prototype solid state hydrogen storage tank that is coupled to a HT-PEM fuel cell. In order to perform design simulations for this prototype reactor with a hydrogen capacity of 2 kWhel, model equations for the rate of hydrogen sorption reactions are required. Therefore, several material properties, like bulk density and thermodynamic data, have been measured. Furthermore, isothermal absorption and desorption experiments are performed in a temperature and pressure range that is in the focus of the coupling system. Using experimental data, two-step model equations have been fitted for the hydrogen absorption and desorption reactions. These empirical model equations are able to capture the experimentally measured reaction rates and can be used for model validation of the design simulations.

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