fig3

Figure 3. Electrocatalytic OER performance of various electrocatalysts in 1 M KOH. (A) LSV curves, (B) Overpotentials at the current densities of 10 and 100 mA cm^-2, (C) Tafel slopes, (D) EIS spectra and (E) C_dl values of CoO_x-CO₃^2-, IrCoO_x-CO₃^2-, IrCoO_x-PO₄^3-, IrCoO_x-OH^-, respectively. (F) OER stability testing of IrCoO_x-CO₃^2- at 100 mA cm^-2; (G) A comprehensive comparison of overpotentials at 10 mA cm^-2 for IrCoO_x-CO₃^2- electrode with reported state-of-the-art Ir doped or Co-based electrocatalysts.