Improvement of hydrogen storage property of three-component Mg(NH2)2–LiNH2–LiH composites by additives

摘要: The three-component Mg(NH2)2–LiNH2–4LiH composite reversibly stores hydrogen exceeding 5 wt% at a temperature as low 150 °C. In this work, number of additives such CeF4, CeO2, TiCl3, TiH2, NaH, KBH4 and KH are added to the in order improve its kinetics, thermodynamics cycling properties. Addition 3 reduces dehydrogenation onset below 90 °C without emission NH3 during whole process up 450 Moreover, kinetics ability remarkably enhanced upon KH-addition. reaction model is altered KH-addition with active molecule density improved by about 200 times. addition, optimization ratio Mg2+ Li+ Mg(NH2)2–LiNH2–LiH system, several novel composites, e.g., Mg(NH2)2–2LiNH2–5.9LiH–0.1KH Mg(NH2)2–LiNH2–5.9LiH–0.1KH, storage capacity 6 250 developed. Our study demonstrates that there various undiscovered candidates promising properties Li–Mg–N–H system.