Anion ordering enables fast H − conduction at low temperatures
| Autor: | Ubukata, Hiroki, Takeiri, Fumitaka, Shitara, Kazuki, Tassel, Cédric, Saito, Takashi, Kamiyama, Takashi, Broux, Thibault, Kuwabara, Akihide, Kobayashi, Genki, Kageyama, Hiroshi |
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| Rok vydání: | 2021 |
| Předmět: |
Multidisciplinary
Materials science Hydrogen Hydride Materials Science SciAdv r-articles chemistry.chemical_element Ionic bonding 02 engineering and technology Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology Thermal conduction 01 natural sciences 0104 chemical sciences Ion Chemistry chemistry Chemical physics Ionic conductivity Hexagonal lattice 0210 nano-technology Research Articles Research Article |
| Zdroj: | Science Advances |
| ISSN: | 2375-2548 |
| Popis: | The introduction of chemical disorder by substitutional chemistry into ionic conductors is the most commonly used strategy to stabilize high-symmetric phases while maintaining ionic conductivity at lower temperatures. In recent years, hydride materials have received much attention owing to their potential for new energy applications, but there remains room for development in ionic conductivity below 300°C. Here, we show that layered anion-ordered Ba2−δH3−2δX (X = Cl, Br, and I) exhibit a remarkable conductivity, reaching 1 mS cm⁻¹ at 200°C, with low activation barriers allowing H⁻ conduction even at room temperature. In contrast to structurally related BaH2 (i.e., Ba2H4), the layered anion order in Ba2−δH3−2δX, along with Schottky defects, likely suppresses a structural transition, rather than the traditional chemical disorder, while retaining a highly symmetric hexagonal lattice. This discovery could open a new direction in electrochemical use of hydrogen in synthetic processes and energy devices. H¯イオンの低温高速伝導を実現. 京都大学プレスリリース. 2021-06-03. Bringing order to hydrogen energy devices. 京都大学プレスリリース. 2021-06-03. |
| Databáze: | OpenAIRE |
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