metal hydride

mg oh

hydrogen storage properties

Journal of alloys and compounds

• Much smaller and uniform TiO 2 nanoparticles are achieved during solvothermal process with ethylene glycol as solvent. • MgH 2 -70TiO 2 @rGO composite starts to release hydrogen at 240 °C. • Encapsulation structure and multivalent titanium compounds lead to the enhanced hydrogen storage properties. Schematic illustration for the preparation of catalysts. In this paper, we synthesized graphene-supported TiO 2 nanoparticles (TiO 2 @rGO) via solvothermal method with different solvents. The combined effect of ethylene glycol (EG) and graphene makes fine, uniform TiO 2 nanoparticles during solvothermal process. The effects of milling time and TiO 2 content on hydrogen storage performance of MgH 2 were investigated systematically. The MgH 2 -70TiO 2 @rGO-EG composite milled for 10 h starts to release hydrogen at 240 °C. The composite can desorb 6.0 wt% hydrogen within 6 min at 300 °C, while it can absorb 5.9 wt% hydrogen within 2 min at 200 °C. XPS and TEM results indicate that Mg encapsulated with catalyst as well as Ti 4+ partially reduced to Ti 2+ can make more intimate contacts and promote the charge transfer, which are responsible for the good de-/hydrogenation kinetics performance of MgH 2 .

Enhanced catalytic effect of TiO2@rGO synthesized by one-pot ethylene glycol-assisted solvothermal method for MgH2