Reversible hydrogen storage in Ti-Zr-codoped NaAlH4 under realistic operation conditions

Ti-Zr-codoped NaAlH4 exhibits improved hydrogen desorption and reabsorption properties compared with sole Ti- or Zr-doped alanate. This contribution aims on reversible hydrogen storage in such material under realistic operation conditions. Results on isothermal dehydrogenation-rehydrogenation cycles at 125 degrees C and desorption at 4 bar hydrogen back-pressure are presented, proving NaAlH4 to be a suitable hydrogen material in combination with proton exchange membrane fuel cells.