| 초록 |
Solid-state hydrogen storage with high volumetric density can be an optimal solution for effective hydrogen energy utilization, compared to the current gaseous storage system. Especially, Mg is considered a promising candidate with high hydrogen capacity of 7.6 wt% and abundance on Earth, but it still needs further improvements because of its sluggish kinetics and limited thermodynamics related to hydrogen sorption reaction. In this study, nanoporous Mg structure is synthesized via a reduction-induced decomposition to overcome such barriers. Porous structure could enhance the kinetics with reduced hydrogen diffusion length and high surface area, also alleviating the issue of volume expansion during hydrogen storage process. The synthetic approach in this study is a facile and scalable solution-based method, which is more efficient than the conventional dealloying to synthesize porous metal. The well-crystallized pure Mg porous structure was obtained and its hydrogen uptake/release capacity increases up to 6 wt% as the hydrogen cycle proceeds. It is expected that hydrogen storage through porous Mg structures can contribute to advancing the hydrogen energy industry in the future. |
