Material properties and empirical rate equations for hydrogen sorption reactions in 2 LiNH2-1.1 MgH2-0.1 LiBH4-3 wt.% ZrCoH3

I. Bürger, J. J. Hu, J. G. Vitillo, G. N. Kalantzopoulos, S. Deledda, M. Fichtner, M. Baricco, M. Linder

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Abstract

2 LiNH2-1.1 MgH2-0.1 LiBH4-3 wt.% ZrCoH3 is a solid state hydrogen storage material with a hydrogen storage capacity of up to 5.3 wt.%. As the material shows sufficiently high desorption rates at temperatures below 200 °C, it is used for a prototype solid state hydrogen storage tank with a hydrogen capacity of 2 kWhel that is coupled to a high temperature proton exchange membrane fuel cell. In order to design an appropriate prototype reactor, model equations for the rate of hydrogen sorption reactions are required. Therefore in the present study, several material properties, like bulk density and thermodynamic data, are 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.

Original languageEnglish (US)
Pages (from-to)8283-8292
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume39
Issue number16
DOIs
StatePublished - May 27 2014

Bibliographical note

Funding Information:
The research leading to these results has received funding from the European Union's Seventh Framework Programme (FP7/2007-2013) for the Fuel Cells and Hydrogen Joint Technology Initiative under grant agreement n. 256653 (SSH2S).

Keywords

  • Hydrogen storage
  • Li-Mg-N-H hydride
  • Model equations
  • Reaction rate

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