Abstract
MgH2 is considered one of the most promising candidates for solid-state hydrogen storage. However, the dehydrogenation of MgH2 generally happens at temperatures above 250 °C even after catalyzing and/or nano-confining modifications, thus embarrassing the practical use of MgH2 in fuel cells. NH4Cl is a cheap chemical which has mature synthesis technologies in large industrial productions. The protonic H (Hδ+) in NH4Cl and the hydridic H (Hδ−) in MgH2 have coulomb interaction which allow MgH2 to release hydrogen at milder temperatures. In this article, by designing the molar ratio of MgH2 and NH4Cl as 2:1 (equal molar ratio of Hδ+ and Hδ−), the hydrogen release peak temperature can be decreased to 164.8 °C, and the ammonia generation is remarkably suppressed. In particular, graphene introduction to the 2MgH2+NH4Cl composite can further reduce the hydrogen release temperature to 161.2 °C and improve the hydrogen purity up to 97.26%. It is revealed that the smaller particle size and the better dispersion of 2MgH2+NH4Cl/graphene composite allows better interaction between Hδ+ and Hδ−, which brings down the hydrogen desorption temperature and improves the hydrogen purity.
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