fig3

Figure 3. (A) OER performance in the form of overpotential and metal dissolution rates at 5 mA∙cm^-2 geometric current density of different metal electrodes (Au, Pt, Rh, Ir, and Ru) in 0.1 M H₂SO₄; (B) OER performance of thin-film Ir oxide model catalysts in the form of overpotential and Ir dissolution as a function of the calcination temperature (constant Ir loading). Overpotentials and integral Ir dissolution within 10 min were measured at a geometric current density of 2 mA∙cm^-2. Reproduced with permission. Copyright 2017, Wiley Online Library^[36]; (C) TEM images of the electrocatalysts: (C-1) aut-IrO_x, (C-2) IrO_x-300 °C, (C-3) IrO₂-400 °C, and (C-4) IrO₂ -500 °C; (D) OER polarization curves at 5 mV·s^-1 and 1,600 rpm for the IrO_x catalysts; (E) Chronoamperometric curves recorded at 1.55 V for the IrO_x catalysts. Reproduced with permission. Copyright 2017, Elsevier^[39].