Hydrogen Storage in Solid Materials

Metal hydrides are hydrogen atom -carriers usable as storage system [107, 110, 116, 117]. The method is based on specific properties of some metals that readily absorb gaseous hydrogen, thanks to their capability to accept hydrogen atoms, derived by its molecule splitting, inside their interstitial sites in reasonable operative conditions. 

A schematic hydrogen absorption mechanism consists in the following three steps  

physical adsorption with successive molecule dissociation 

transition of hydrogen atoms to the metal bulk with formation of new solid phases. 

The different metal hydrides can be classified in two main categories  

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The HAR was usually studied from permeation experiments using the electrochemical permeation technique. The other way was by charging experiments. With the development of techniques of hydrogen storage in solid materials, there has been a renewal of interest in the H absorption reaction [2-6] and a need to monitor the conditions for obtaining high concentrations of H in the bulk (and establishing relations not restricted to low levels of H concentrations and to low overpotentials). 

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