Figure 4.

Current‐potential relationship for the OER over IrO_x at various temperatures. (a) LSVs over the IrO_x disk electrode in the RDE configuration are shown, recorded in electrolyte solutions of 1.0 mol kg⁻¹ Na‐phosphate at pH 7 and 0.1 mol kg⁻¹ NaOH at pH 12.9 at a disk rotation speed of 3600 rpm, a scan rate of −1 mV s⁻¹, and reaction temperatures of 298 K (dashed line) and 343 K (solid line). (b) Overpotentials reaching +10 mA cm⁻² over the IrO_x RDE are plotted as a function of the reaction temperature, recorded in electrolyte solutions of 1.0 mol kg⁻¹ Na‐phosphate at pH 7.0, 1.0 mol kg⁻¹ Na‐borate at pH 9.2, 1.0 mol kg⁻¹ Na‐carbonate at pH 10.3, and 0.1 mol kg⁻¹ NaOH at pH 12.9 at 3600 rpm, −1 mV s⁻¹.