Mechanochemistry of multi-element Mg-based complex hydrides for hydrogen storage

The hydrogen energy chain is a crucial component of the energy transition from fossil fuels to renewable energies. Efficient and safe hydrogen storage methods are vital for its success. Reversible hydrogen storage materials with low-cost, lightweight, and versatile hydrogenation properties are needed. This study focuses on investigating the formation of MgyTMHx complex hydrides with y = 2 or 3 and x from 4 to 8, where TM represents 3d late transition metals (Fe, Co, Ni, Mn, and Cr). This will be done by combining TMs that coordinate with 2 Mg atoms to form Mg2TMHx (TM = Fe, Co, and Ni) and compounds with TMs that coordinate with 3 Mg atoms to form Mg3TMHx (TM = Mn, Cr). Using mechanochemistry under hydrogen gas, phase formation of single-phase Mgbased complex hydrides will be analyzed. The crystal structure will be studied using X-Ray Diffraction (XRD), thermal stability will be assessed through temperature programmed desorption. Then the kinetics will be studied using the Sievert method, and PCI will also be performed. This research aims to produce novel materials with versatile properties and gain new knowledge in the unexplored field of multi-elementary complex hydrides.