Fig. 4: Performance of NiFe-Boride catalyst and controls in a three-electrode configuration in 1M KOH aqueous electrolyte.
a OER LSV polarization curves for catalysts loaded on Ni foam without iR correction. b The corresponding Tafel plot of catalysts. c Comparison of Tafel slope and overpotential required to achieve 10 mA/cm2, with references all measured in alkaline medium47,48,49,50,51,52,53,54,55,56,57. d EIS data for NiFe-Boride and controls in three-electrode configuration. The data were collected at 1.45 V vs. RHE. The inset provides the equivalent circuit: Rs series resistance, Rct charge-transfer resistance, and CPE constant-phase element related to the double-layer capacitance. e Chronopotentiometric curves obtained from the NiFe-Boride catalyst on Ni foam electrode at a constant current density of 20 mA/cm2. f Comparison of stability at different current density, with references all measured in alkaline medium13,14,15,33,58. g Operating voltage and O2 FE at constant 1 A/cm2 current density in a three-electrode configuration in 1 M KOH aqueous electrolyte. h The operating voltage and ethylene FE were monitored at constant 200 mA/cm2 in a membrane-electrode assembly device. NiFe-Boride and IrO2 supported on titanium felt were used as the anodes. The high surface area Cu catalyst on hydrophobic carbon paper acted as cathode. Humidified CO was flowed through the gas channels in the cathode, and 2 M aqueous KOH solution was flowed through channels in the anode.
