Molecular H₂ as the Reducing Agent in Low-Temperature Oxide Reduction Using Calcium Hydride

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 14, 2025

Low-temperature synthesis is crucial for advancing sustainable manufacturing and accessing novel metastable phases. Metal hydrides have shown great potential in facilitating the reduction of oxides at low temperatures, yet underlying mechanism─whether driven by H–, H2, or atomic H─remains unclear. In this study, we employ situ electrical transport measurements first-principles calculations to investigate CaH2-driven kinetics epitaxial α-Fe2O3 thin films. Intriguingly, samples direct contact with separated from CaH2 powders exhibit similar apparent activation energies H2 reduction, although significantly increases rate. These findings indicate that molecular dominant reducing species low-temperature using CaH2, a key aspect hydrides' superior power attributed their ability eliminate residual moisture. This work underscores critical role moisture control enabling effective oxide advanced material synthesis.

Language: Английский

Synthesis and Crystal Structure of Perovskite Nickelates R_0.8A_0.2NiO₃ and Infinite-layer Nickelates R_0.8A_0.2NiO₂ (R = Pr, Nd, Sm, Eu; A = Sr, Ca)

Journal of the Physical Society of Japan, Journal Year: 2025, Volume and Issue: 94(5)

Published: April 22, 2025

Language: Английский