AUTHOR=Wang Ke , Deng Qibo 

TITLE=Constructing Core-Shell Co@N-Rich Carbon Additives Toward Enhanced Hydrogen Storage Performance of Magnesium Hydride

JOURNAL=Frontiers in Chemistry

VOLUME=8

YEAR=2020

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.00223

DOI=10.3389/fchem.2020.00223

ISSN=2296-2646

ABSTRACT=<p>Magnesium hydride (MgH<sub>2</sub>) is regarded as a promising solid-state hydrogen storage material, on account of its moderate price and high gravimetric capacity. However, MgH<sub>2</sub>'s inferior kinetic of hydrogen release impedes its widespread application. In this work, we use core-shell Co@N-rich carbon (CoNC) additive as catalysts to ameliorate the performances of MgH<sub>2</sub>. The surface morphologic structures and hydrogen desorption kinetics of different MgH<sub>2</sub>-CoNC composites are systematically studied. We find that MgH<sub>2</sub>-5 wt% CoNC with carbon contents of 17% (CoNC0) composites exhibit better hydrogen desorption performance. At 325°C, the MgH<sub>2</sub>-5 wt% CoNC0 composites can release up to 6.58 wt% of H<sub>2</sub> in 5 min, which is much higher than 0.3 wt% for pure MgH<sub>2</sub>. Our results demonstrate that importing the core-shell structured catalysts can effectively enhance the hydrogen release kinetics.</p>