Hydrogen absorption and desorption in Mg-Na-N-H system

The interaction between Mg(NH2)(2) and NaH enable Mg-Na-N-H potential candidate for hydrogen storage. Upon heating to 120 degrees C the mixture of Mg(NH2)(2) and NaH gives out hydrogen and converts to a new Mg-Na-N-H structure, which can re-absorb hydrogen at temperature as low as 60 degrees C. Increasing NaH content enhances the chemical stability of the Mg-Na-N-H system; however, it also leads to the high-temperature shift of hydrogen absorption. The desorption plateau is relatively flat, however, pressures are generally low at temperature below 200 degrees C. (c) 2004 Elsevier B.V. All rights reserved.