Facile synthesis of nanoporous Mg crystalline structure by organic solvent-based reduction for solid-state hydrogen storage

Hyesun Kim, HyeonJi Kim, Wonsik Kim, Choah Kwon, Si-Won Jin, Taejun Ha, Jae-Hyeok Shim, Soohyung Park, Aqil Jamal, Sangtae Kim () and Eun Seon Cho ()
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Hyesun Kim: Korea Advanced Institute of Science and Technology (KAIST)
HyeonJi Kim: Korea Advanced Institute of Science and Technology (KAIST)
Wonsik Kim: Korea Institute of Science and Technology (KIST)
Choah Kwon: Hanyang University
Si-Won Jin: Korea Institute of Science and Technology (KIST)
Taejun Ha: Korea Institute of Industrial Technology (KITECH)
Jae-Hyeok Shim: Korea Institute of Science and Technology (KIST)
Soohyung Park: Korea Institute of Science and Technology (KIST)
Aqil Jamal: Saudi Aramco
Sangtae Kim: Hanyang University
Eun Seon Cho: Korea Advanced Institute of Science and Technology (KAIST)

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Nanoporous metals have unique potentials for energy applications with a high surface area despite the percolating structure. Yet, a highly corrosive environment is required for the synthesis of porous metals with conventional dealloying methods, limiting the large-scale fabrication of porous structures for reactive metals. In this study, we synthesize a highly reactive Mg nanoporous system through a facile organic solution-based approach without any harsh etching. The synthesized nanoporous Mg also demonstrates enhanced hydrogen sorption kinetics and reveals unique kinetic features compared to Mg nanoparticles. The well-crystallized Mg nanoporous structure exhibits crystalline facet-dependent hydrogen sorption characteristics, featuring gradually improved hydrogen storage capacity up to 6 wt.% upon cycling. Also, continuum kinetics models coupled to atomistic simulations reveal that the compressive stress developed during the hydrogenation of nanoporous Mg enhances the sorption kinetics, as opposed to the sluggish kinetics under tensile stress in core-shell nanoparticles. It is expected that the synthetic strategy conceived in this study can be further implemented to prepare different kinds of reactive porous metals in a facile and scalable way for the development of large-scale and distributed hydrogen storage systems for the emerging low-carbon hydrogen economy.

Date: 2024
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DOI: 10.1038/s41467-024-55018-y

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