Oxyhydride synthesis through facile water dissociation on the electride intermetallic LaScSi
Résumé
The simultaneous presence of hydride (H–) and oxide (O2–) anions in an inorganic material is thermodynamically challenging. Oxyhydrides have always been synthesized from an oxide precursor, by using high-temperature solid-state reaction using a mixture of oxide and hydride, topochemical reduction at mild temperatures, or high-pressure synthesis. Here, we introduce a novel and unprecedented synthesis route for transition metal oxyhydrides, where the starting material is not an oxide but an intermetallic compound, LaScSi. The topochemical synthesis of LaScSiOxHy (x ≈ 0.5, y ≈ 1) occurs through water dissociation, highlighting the exceptional catalytic behavior of the electride-type parent material. The topochemical insertion of oxygen and hydrogen transforms LaScSi into a more two-dimensional material and modifies its electronic properties, altering its transport properties, from three-dimensional metallic to semimetallic. This innovative path to oxyhydrides is also of fundamental interest for catalysis: it could open the way for new methods of hydrogen production and storage, especially in water splitting, bypassing traditional processes such as electrolysis or photocatalysis.
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A comme partie 10.5291/ILL-DATA.5-23-820 Jeu de données TENCE Sophie, ALABD khaled, GAUDIN Etienne, & RITTER Clemens. (2024). Activation and splitting of H2, H2O, CO/CO2, and O2 molecules on the electride catalyst LaScSi evidenced by neutron diffraction [Dataset]. Institut Laue-Langevin (ILL). https://doi.org/10.5291/ILL-DATA.5-23-820
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A comme partie 10.5291/ILL-DATA.5-22-808 Jeu de données ALABD khaled, GAUDIN Etienne, SUARD Emmanuelle, & TENCE Sophie. (2023). Structural study of new hydrogenated intermetallic electrides for the synthesis of ammonia [Dataset]. Institut Laue-Langevin (ILL). https://doi.org/10.5291/ILL-DATA.5-22-808