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

Abstract MgH 2 is a promising high-capacity solid-state hydrogen storage material, while its application is greatly hindered by the high desorption temperature and sluggish kinetics. Herein, intertwined 2D oxygen vacancy-rich V 2 O 5 nanosheets (H-V 2 O 5 ) are specifically designed and used as catalysts to improve the hydrogen storage properties of MgH 2 . The as-prepared MgH 2 -H-V 2 O 5 composites exhibit low desorption temperatures ( T onset = 185 °C) with a hydrogen capacity of 6.54 wt%, fast kinetics ( E a = 84.55 ± 1.37 kJ mol −1 H 2 for desorption), and long cycling stability. Impressively, hydrogen absorption can be achieved at a temperature as low as 30 °C with a capacity of 2.38 wt% within 60 min.…

• SJ
  Shanghai Jiao Tong University