Fig. 4: OER electrochemical performances in three-electrode system.

a LSV curves (scan rate: 5 mV s⁻2) after iR compensation (90%) with mass loading of 1.2 mg cm⁻2. b Corresponding Tafel slopes. c Corresponding mass-activity curves. d Nyquist plots at 1.53 V Vs. RHE. e Stability test of three-electrode systems at 10 mA cm−2.