Synthesis and dehydrogenation properties of NaZn(BH4)3•en and NaZn(BH4)3•2en (en = ethylene diamine)

Two new hydrogen storage compounds, NaZn(BH4)(3)center dot en and NaZn(BH4)(3)center dot 2en (en=ethylene diamine) are synthesized by a solution method. They can release 6.4 wt% and 6.3 wt% pure hydrogen below 200 degrees C, 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 H delta+-H delta- interactions are significant for their stability below 100 degrees C, relatively low decomposition temperatures and elimination of gas impurities. (C) 2019 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.