Boosting Hydrogen Storage Performance of MgH2 by Oxygen Vacancy-Rich H-V2O5 Nanosheet as an Excited H-Pump

Abstract

Highlights Graphene-like 2D V2O5 nanosheets rich in oxygen vacancies are designed as multi-functional catalysts to fabricate MgH2-H-V2O5 composites. Hydrogen release starts from 185 °C and capacity retention is as high as 99% after 100 cycles at 275 °C. The composites present rapid kinetics and impressive hydrogen absorption capability at near room temperature. The oxygen vacancies could directly enhance kinetics of MgH2 while indirectly exciting “hydrogen pump” effect of VH2/V.

Keywords

• Hydrogen storage
• MgH2
• V2O5 nanosheets
• Oxygen vacancies
• VH2