Issue 38, 2024

In situ construction of dual-functional Ni/NixB catalysts for the hydrogenation and dehydrogenation of magnesium hydride

Abstract

Hydrogen sorption catalysts loaded on porous supports can promote reversible H ↔ H0 and metal ↔ metal ion reactions. However, uniform dispersion of catalytic nanoparticles in the matrix is required to synergistically promote MgH2 hydrogenation, diffusion, and dehydrogenation. In this study, we decorated hexagonal boron nitride (h-BN) in situ with NixB. Experimental characterization demonstrated the uniform distribution of NixB in the h-BN matrix. The nickel atoms were introduced into the porous h-BN matrix through Ni–B bonds, which effectively limited nanoparticle growth. Simulations of the hydrogenation and dehydrogenation pathways of several Ni/NixB@MgH2 composites suggested that the Ni/NixB catalyst should have efficient catalytic performance. The composite had a hydrogen storage capacity of approximately 7.0 wt% at 200 °C and released approximately 4.5 wt% H2 within 10 min, with rapid kinetics and stable reversible cycling. Finally, the thermodynamics and kinetics of hydrogenation/dehydrogenation in the presence of the composite catalysts were theoretically evaluated.

Graphical abstract: In situ construction of dual-functional Ni/NixB catalysts for the hydrogenation and dehydrogenation of magnesium hydride

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Article information

Article type
Paper
Submitted
02 ago 2024
Accepted
27 ago 2024
First published
11 set 2024

J. Mater. Chem. A, 2024,12, 25829-25836

In situ construction of dual-functional Ni/NixB catalysts for the hydrogenation and dehydrogenation of magnesium hydride

H. Liang, W. Li and J. Zheng, J. Mater. Chem. A, 2024, 12, 25829 DOI: 10.1039/D4TA05395H

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