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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.
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...
Understanding the Context
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.
The formation mechanism of IrO2 nanoribbon is clearly revealed, with its further conversion to IrO2 nanosheet with a trigonal phase.
The XAS and EXAFS analyses revealed that the Ir O phase consists of a mixture of metallic and oxidized states of iridium (Ir and Ir 4+ O 2). The presence of other platinum-group.
The EXAFS spectrum of an IrO2 standard sample and the corresponding FT is also shown for reference. IrO2 is characterized by a well-defined peak at ca. 2 , corresponding to the six O.
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Key Insights
Achieving monolayer thickness while exposing this desired facet is a significant opportunity for IrO 2. Herein, we develop an ammonia-induced facet engineering for the synthesis of...
In order to reveal the origin of the high performance of new catalyst 3R-IrO 2, we measured the fast operando Ir-L3 XANES and EXAFS spectra of 3R-IrO2 under OER conditions.
Operando X-ray absorption spectroscopy (XAS) and X-ray photoelectron spectroscopy (XPS) studies indicate the presence of iridium hydroxo (IrOH) surface species, which are strongly.
