Multi-technique characterization of atomic-layer-deposition-functionalized magnesium borohydride hydrogen storage materials

Hydrogen storage technologies are essential for the implementation of a cost-effective hydrogen economy. This talk focuses on novel, atomic layer deposition (ALD)-functionalized, magnesium borohydride (MBH) materials with the potential to store hydrogen at relatively low temperatures, moderate pressures, and energy densities greater than liquid or compressed hydrogen.¹ This ALD functionality shows improved hydrogen desorption from the neat MBH material, however the coating is not well understood. In order to better understand the mechanism of hydrogen adsorption and desorption with this coated MBH material, a thorough set of characterization techniques is needed, however the air- and beam- sensitivity of MBH materials present significant challenges. This talk defines these challenges and proposes potential solutions in order to conduct multi-scale, multi-technique characterization including ex-situ, identical location scanning transmission electron microscopy (STEM) and X-ray-spectroscopies. Combined with temperature programmed desorption (TPD), these studies reveal elusive interactions between the MBH materials and their coatings to further optimize the functionalization of MBH materials for hydrogen storage.

[1] Y. Filinchuk, et al., Angewandte Chemie 123, 11358 (2011).