Abstract
The interaction between fluorinated surface in the partially reduced nano-crystallite titanium dioxide (TiO2-x(F)) and MgH2 is studied for the first time. Compared with pristine MgH2 (416°C), the onset desorption temperature of MgH2+5wt.% TiO2-x(F) composite can be dramatically lowered to 189°C. In addition, the composite exhibits remarkable dehydrogenation kinetics, which can release 6.0wt.% hydrogen thoroughly within 6min at 250°C. The apparent activation energy for dehydriding is decreased from 268.42 to 119.96kJmol-1. Structural characterization and theoretical calculations indicate that the synergistic effect between multivalent Ti species, and the in situ formed MgF2 and MgF2-xHx is beneficial for improving the hydrogen storage performance of MgH2. Moreover, oxygen vacancies can accelerate the electron transportation and facilitate hydrogen diffusion. The study provides a novel perspective on the modification of MgH2 by fluorinated transition metal oxide catalyst.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
