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

Frontiers in Chemistry

Qibo Deng³  Ke Wang⁴ 

[1] Low-Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, China;;Institute for New Energy Materials &Research Institute for Structure Technology of Advanced Equipment, School of Mechanical Engineering, Hebei University of Technology, Tianjin, China;School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai, China;

关键词: magnesium hydride;    hydrogen storage performance;    core-shell (C-S)nanostructures;    carbon additives;    dehydrogenation kinetics;   

DOI  :  10.3389/fchem.2020.00223

来源: DOAJ

【 摘 要 】

Magnesium hydride (MgH2) is regarded as a promising solid-state hydrogen storage material, on account of its moderate price and high gravimetric capacity. However, MgH2'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 MgH2. The surface morphologic structures and hydrogen desorption kinetics of different MgH2-CoNC composites are systematically studied. We find that MgH2-5 wt% CoNC with carbon contents of 17% (CoNC0) composites exhibit better hydrogen desorption performance. At 325°C, the MgH2-5 wt% CoNC0 composites can release up to 6.58 wt% of H2 in 5 min, which is much higher than 0.3 wt% for pure MgH2. Our results demonstrate that importing the core-shell structured catalysts can effectively enhance the hydrogen release kinetics.

【 授权许可】

Unknown