Figure 3
From: Noble metal-free bifunctional oxygen evolution and oxygen reduction acidic media electro-catalysts
(a) The polarization curve of Cu1.5Mn1.5O4:F of different F content using total loading of 1 mg/cm2 obtained in 0.5 M H2SO4 solution at 40 °C with scan rate of 5 mV/sec after iRΩ correction, (b) The polarization curve of Cu1.5Mn1.5O4:10F using total loading of 1 mg/cm2 and in-house synthesized IrO2 using total loading of 0.15 mg/cm2 obtained in 0.5 M H2SO4 solution at 40 °C with a scan rate of 5 mV/sec after iRΩ correction, (c) Comparison of electrochemical activity for OER at ~1.55 V (vs RHE) between Cu1.5Mn1.5O4:F of different F content (total loading of 1 mg/cm2) and IrO2 (total loading of 0.15 mg/cm2) (d) The cyclic voltammograms (CVs) of Cu1.5Mn1.5O4:F of different F content and Pt/C, measured in N2 saturated 0.5 M H2SO4 at 26 °C at scan rate of 5 mV/sec using total loading of 50 μg/cm2 for Cu1.5Mn1.5O4:F and Pt loading of 30 μgPt/cm2 for Pt/C, (e) The magnified view between ~0.6 V–~0.9 V (vs RHE) of CV curves obtained in N2-saturated 0.5 M H2SO4 at 26 °C at scan rate of 5 mV/sec using total loading of 50 μg/cm2 for Cu1.5Mn1.5O4:F of different F content and Pt loading of 30 μgPt/cm2 for Pt/C, (f) EIS spectra (for OER) of Cu1.5Mn1.5O4:F of different F content (total loading of 1 mg/cm2) and in-house synthesized IrO2 (total loading of 0.15 mg/cm2) performed at ~1.55 V (vs RHE) in 0.5 M H2SO4 at 40 °C in the frequency range of 100 mHz to 100 kHz (using amplitude of 10 mV).
