Oxygen Dimerization and Lattice Instability in Perovskite Oxide

I will discuss how lattice oxygen redox and chemo-mechanical coupling in a perovskite electrocatalyst develops upon intercalation of O^2- under OER conditions. We employ high-resolution resonant inelastic X-ray scattering (RIXS) to detect the oxidation state of oxygen and show that the emergence of oxygen dimers depends on the transition metal. Our study suggests that the oxygen dimerization originates from an intrinsic lattice instability that develops inside the electrocatalyst upon extreme oxidation.<br/><br/>Bosse et al. Molecular O2 Dimers and Lattice Instability in a Perovskite Electrocatalyst. <i>ChemRxiv</i> (2024).