Hydrogen Desorption Reaction between Hydrogen-Containing Functional Groups and Lithium Hydride

Abstract

Three kinds of hydrogen-containing products were synthesized from hBN by ball-milling under hydrogen (H2), methane (CH4), and ammonia (NH3) atmosphere, in which these products are named BNnanoXHx (X = C, N). BNnanoHx, BNnanoCHx, and BNnanoNHx desorbed H2, CH4, and NH3, respectively, in the wide temperature range from 100 to 900 °C. From infrared spectroscopy for these products, the existence of some polarized functional groups such as B−H, C−H, or N−H bonds in the products was clarified. Afterward, the products were mixed with lithium hydride (LiH) to synthesize the composite by ball-milling. All the BNnanoXHx and LiH composites can release mainly H2 around 200 °C, indicating that the hydrogenated states as the polarized functional groups in each product would be destabilized by an interaction with LiH. Therefore, the BNnanoXHx and LiH systems are recognized as a hydrogen storage system with H2 release at relatively low temperature due to the characteristic interaction.