Two new hydrogen storage compounds,NaZn(BH4)3·en and NaZn(BH4)3·2en (en=ethylene diamine) are synthesized by a solution method.They can release 6.4 wt% and 6.3 wt% pure hydrogen below 200 ℃,respectively,demonstrating the potential to be used as hydrogen carriers.Additionally,their dehydrogenation products,thermodynamics and kinetics are well characterized and analyzed.Results shows that the stronger Zn-N interactions and the Hδ+-Hδ-interactions are significant for their stability below 100 ℃,relatively low decomposition temperatures and elimination of gas impurities.