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Sun, 03 May 2026 02:20:50 +0000

Hexavalent iridium (Ir VI) oxide is predicted to be more active and stable than any other iridium oxide for the oxygen evolution reaction in acid; however, its experimental realization remains challenging. The structure of IrO2 during the oxygen evolution reaction (OER) was studied by operando X-ray absorption spectroscopy (XAS) at the Ir L3-edge to gain insight into the processes. In this study, a monoclinic phase iridium oxide nanoribbon with a space group of C2/m is successfully obtained, which is distinct from rutile iridium oxide with a stable tetragonal phase... Iridium oxide powders with a surface area of more than 1 m 2 g 1 (4 m 2 g 2 from the H-UPD charge) and iridium-oxide crystallites less than 10 nm across were synthesized by heat.