Monitoring the Structural Changes in Iridium Nanoparticles during Oxygen Evolution Electrocatalysis with <i>Operando</i> X-ray Total Scattering.

ABSTRACT: Understanding the structure of nanoparticles under (electro)catalytic operating conditions is crucial for uncovering structure-property relationships. By combining operando X-ray total scattering and pair distribution function analysis with operando small-angle X-ray scattering (SAXS), we obtained comprehensive structural information on ultrasmall (<3 nm) iridium nanoparticles and tracked their changes during oxygen evolution reaction (OER) in acid. When subjected to electrochemical conditions at reducing potentials, the metallic Ir nanoparticles are found to be decahedral. The iridium oxide formed in the electrochemical oxidation contains small rutile-like clusters composed of edge- and corner-connected [IrO₆] octahedra of a very confined range. These rutile domai

SUBMITTER: Pittkowski RK 

PROVIDER: S-EPMC11468871 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature