Journal
SCIENTIFIC REPORTS
Volume 11, Issue 1, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41598-021-85540-8
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (Kyoto Next-generation Energy System Creation Strategy)
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Nanoporous mayenite in the hydride state shows potential for hydrogen storage and transportation, with easy desorption of H- ions and 100% recyclability. Various analyses confirmed the presence of hydrogen molecules as H- ions trapped in the structure.
We utilized nanoporous mayenite (12CaO.7Al(2)O(3)), a cost-effective material, in the hydride state (H-) to explore the possibility of its use for hydrogen storage and transportation. Hydrogen desorption occurs by a simple reaction of mayenite with water, and the nanocage structure transforms into a calcium aluminate hydrate. This reaction enables easy desorption of H- ions trapped in the structure, which could allow the use of this material in future portable applications. Additionally, this material is 100% recyclable because the cage structure can be recovered by heat treatment after hydrogen desorption. The presence of hydrogen molecules as H- ions was confirmed by H-1-NMR, gas chromatography, and neutron diffraction analyses. We confirmed the hydrogen state stability inside the mayenite cage by the first-principles calculations to understand the adsorption mechanism and storage capacity and to provide a key for the use of mayenite as a portable hydrogen storage material. Further, we succeeded in introducing H- directly from OH- by a simple process compared with previous studies that used long treatment durations and required careful control of humidity and oxygen gas to form O-2 species before the introduction of H-.
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