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

Abstract

Magnesium hydride (MgH 2) is regarded as a promising solid-state hydrogen storage material, on account of its moderate price and high gravimetric capacity. However, MgH 2 '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 2. The surface morphologic structures and hydrogen desorption kinetics of different MgH 2-CoNC composites are systematically studied. We find that MgH 2-5 wt% CoNC with carbon contents of 17% (CoNC0) composites exhibit better hydrogen desorption performance. At 325 • C, the MgH 2-5 wt% CoNC0 composites can release up to 6.58 wt% of H 2 in 5 min, which is much higher than 0.3 wt% for pure MgH 2. Our results demonstrate that importing the core-shell structured catalysts can effectively enhance the hydrogen release kinetics.

Noble Metal-Based Catalysts with Core-Shell Structure for Oxygen Reduction Reaction: Progress and Prospective

“…With the development and progress of science and technology, the exploitation and utilization of fossil fuels has reached its peak [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. However, fossil fuel is a kind of non-renewable energy.…”

Co-Addition of Mg2Si and Graphene for Synergistically Improving the Hydrogen Storage Properties of Mg−Li Alloy

“…However, the unfavorably high thermal stability and sluggish dehydrogenation kinetics significantly limit its practical application ( Luo et al, 2019 ; Zhang et al, 2020a ). Many attempts have been carried out to improve the dehydrogenation and rehydrogeantion properties of MgH 2 , including alloying ( Hardian et al, 2018 ; Hui et al, 2020 ; Ali and Ismail, 2021 ), nanoengineering ( Zhang et al, 2020a ; Zhang et al, 2021c ; Thi Thu et al, 2021 ), and catalyst addition ( Zhong et al, 2018 ; Li et al, 2019b ; Liu et al, 2020b ; Zhang et al, 2020b ; Ding et al, 2020 ; Singh et al, 2020 ; Sun et al, 2020 ; Wang and Deng, 2020 ; Yao et al, 2020 ; Zeng et al, 2020 ; Zhu et al, 2020 ; Lu et al, 2021a ; Lu et al, 2021b ; Liu et al, 2021c ; Liu et al, 2021 ), etc. Li is also a H-absorbing metal and has a hydrogen capacity of 11.5 wt.%.…”