Solid hydrogen storage materials have been investigated as hydrogen carriers due to their safety in hydrogen applications. In contrast, they also have some disadvantages, such as a low hydrogen capacity, very high desorption/adsorption temperature, low kinetic rate, and low reversibility. Many attempts have been made to improve and identify materials that can be applied for on-board hydrogen storage for fuel cells. This work investigates the ternary mixture of complex hydrides—LiNH₂+LiAlH₄+MgH₂—on the desorption/absorption temperature for a set of novel hydrogen storage materials. The ternary mixture is prepared by using mechanical ball-milling. In previous studies, the results from the reaction of the binary mixture 2LiNH₂+MgH₂ showed that the kinetic rate was slow and created a serious problem in NH₃ emission. The LiAlH₄ was also studied and it was reported that the kinetic barrier transformation was easily overcome by mixing it with LiNH₂ and its stability of dehydriding was also controlled. One of these reactions, Mg(NH₂)₂+2LiH ↔ Li₂Mg(NH)₂+2H₂ is known as a reversible reaction. Our study demonstrates that by starting from the ternary mixture of complex hydrides—LiNH₂+LiAlH₄+MgH₂—the kinetic rate is improved and the reversibility is maintained. Phase transformation and the amount of hydrogen desorption are analyzed by XRD and TPD measurements.

Keywords: LiNH₂, LiAlH₄, MgH₂, Hydrogen Storage, Complex Hydrides