Figure 4
From: Noble metal-free bifunctional oxygen evolution and oxygen reduction acidic media electro-catalysts
(a) Galvanostatic (constant current) measurement of electrochemical activity of Cu1.5Mn1.5O4:10F (total loading = 1 mg/cm2) and in-house synthesized IrO2 (total loading = 0.15 mg/cm2) performed in 0.5 M H2SO4 electrolyte solution at 40 °C at constant current of ~16 mA/cm2, (b) The polarization curves of Cu1.5Mn1.5O4:F of different F content and Pt/C obtained in O2-saturated 0.5 M H2SO4 solution at 26 °C with rotation speed of 2500 rpm and scan rate of 5 mV/sec after iRΩ correction using total loading of 50 μg/cm2 for Cu1.5Mn1.5O4:F and Pt loading of 30 μgPt/cm2 for Pt/C, (c) Comparison of electrochemical activity for ORR at ~0.9 V (vs RHE) between Cu1.5Mn1.5O4:F of different F content (total loading of 50 μg/cm2) and Pt/C (Pt loading of 30 μgPt/cm2). (d) EIS spectra (for ORR) of Cu1.5Mn1.5O4:F of different F content (total loading of 50 μg/cm2) and Pt/C (Pt loading of 30 μgPt/cm2) performed at ~0.9 V (vs RHE) in O2-saturated 0.5 M H2SO4 at 26 °C in the frequency range of 100 mHz to 100 kHz (using amplitude of 10 mV).
