TY - JOUR
T1 - Improvement of hydrogen storage property of three-component Mg(NH2)2-LiNH2-LiH composites by additives
AU - Lin, Huai Jun
AU - Li, Hai Wen
AU - Paik, Biswajit
AU - Wang, Jianhui
AU - Akiba, Etsuo
PY - 2016/1/1
Y1 - 2016/1/1
N2 - The three-component Mg(NH2)2-LiNH2-4LiH composite reversibly stores hydrogen exceeding 5 wt% at a temperature as low as 150 °C. In this work, a number of additives such as CeF4, CeO2, TiCl3, TiH2, NaH, KBH4 and KH are added to the Mg(NH2)2-LiNH2-4LiH composite in order to improve its kinetics, thermodynamics and cycling properties. Addition of 3 wt% of KH reduces the dehydrogenation onset temperature of the Mg(NH2)2-LiNH2-4LiH composite to below 90 °C without emission of NH3 during the whole dehydrogenation process up to 450 °C. Moreover, the dehydrogenation kinetics and cycling ability are remarkably enhanced upon KH-addition. The reaction model of the Mg(NH2)2-LiNH2-4LiH composite is altered upon KH-addition with the active molecule density improved by about 200 times. In addition, by optimization of the ratio of Mg2+ to Li+ in the Mg(NH2)2-LiNH2-LiH system, several novel composites, e.g., Mg(NH2)2-2LiNH2-5.9LiH-0.1KH and Mg(NH2)2-LiNH2-5.9LiH-0.1KH, with the hydrogen storage capacity exceeding 6 wt% without emission of NH3 below 250 °C are developed. Our study demonstrates that there are various undiscovered candidates with promising hydrogen storage properties in the three-component Li-Mg-N-H system.
AB - The three-component Mg(NH2)2-LiNH2-4LiH composite reversibly stores hydrogen exceeding 5 wt% at a temperature as low as 150 °C. In this work, a number of additives such as CeF4, CeO2, TiCl3, TiH2, NaH, KBH4 and KH are added to the Mg(NH2)2-LiNH2-4LiH composite in order to improve its kinetics, thermodynamics and cycling properties. Addition of 3 wt% of KH reduces the dehydrogenation onset temperature of the Mg(NH2)2-LiNH2-4LiH composite to below 90 °C without emission of NH3 during the whole dehydrogenation process up to 450 °C. Moreover, the dehydrogenation kinetics and cycling ability are remarkably enhanced upon KH-addition. The reaction model of the Mg(NH2)2-LiNH2-4LiH composite is altered upon KH-addition with the active molecule density improved by about 200 times. In addition, by optimization of the ratio of Mg2+ to Li+ in the Mg(NH2)2-LiNH2-LiH system, several novel composites, e.g., Mg(NH2)2-2LiNH2-5.9LiH-0.1KH and Mg(NH2)2-LiNH2-5.9LiH-0.1KH, with the hydrogen storage capacity exceeding 6 wt% without emission of NH3 below 250 °C are developed. Our study demonstrates that there are various undiscovered candidates with promising hydrogen storage properties in the three-component Li-Mg-N-H system.
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U2 - 10.1039/c6dt02845d
DO - 10.1039/c6dt02845d
M3 - Article
AN - SCOPUS:84990063298
VL - 45
SP - 15374
EP - 15381
JO - Dalton Transactions
JF - Dalton Transactions
SN - 1477-9226
IS - 39
ER -