Chemically transformed additive phases in Mg2TiO4 and MgTiO3 loaded hydrogen storage system MgH2

Abstract The present work deals with a comparative study of Mg 2 TiO 4 , MgTiO 3 and titania additives incorporated MgH 2 . Hydrogen storage measurements suggest that all these additives improve the hydrogen desorption/absorption performance of MgH 2 . X-ray diffraction (XRD) and X ray photoelectron spectroscopy (XPS) studies highlight that rock salt phases consisting of highly reduced Ti exist in the samples. These results reiterate that in-situ formation of chemically reduced Ti containing active species is a critical step in the catalysis of TiO 2 /Mg 2 TiO 4 /MgTiO 3 additives loaded MgH 2 .