Fig. 9

a In situ Raman spectra of an Au@SiO₂ particle-coated IrO_x film measured in a 1 M NaClO₄ (pH 10) electrolyte at various potentials. b OER current density and η peak area as a function of the potential. The voltammogram was measured at a scan rate of 5 mV s⁻¹ in 1 M NaClO₄ (pH 10) adjusted with NaOH, reproduced with permission from [46]. Copyright (2020) The Royal Society of Chemistry