Enhanced Dehydrogenation Properties of MgH2 with Delaminated Ti3C2Tx MXene Produced by Simple Wet Method

Magnesium hydride (MgH2) is a promising hydrogen storage material due to its high hydrogen capacity. However, pure MgH2 demonstrates high dehydrogenation temperature and slow reaction kinetics. To overcome these limitations, in this study, delaminated Ti3C2Tx MXene was incorporated into MgH2 using a simple wet mixing process in order to improve dehydrogenation performance. It was found that increasing the MXene content from 1 to 6 wt.% decreased the onset dehydrogenation temperature of the MgH2-Ti3C2Tx composite from 242 to 218 °C, which is significantly lower than that for pure MgH2 (325 °C). The activation energy for hydrogen desorption decreased from 145 kJ/mol for materials containing 1 wt.% Ti3C2Tx to 67–70 kJ/mol for materials containing 3 or 6 wt.%, which is lower than the values reported for ball-milled MXene-MgH2 composites. The wet mixing process preserves the layered structure of MXene and offers a potentially scalable approach for industrial hydrogen storage applications.