Fig. 3: Electrocatalytic performance towards oxygen evolution.
From: Site-specific synergy in heterogeneous single atoms for efficient oxygen evolution
a Polarization curves of catalysts towards oxygen evolution in 1.0 M KOH electrolyte with iR-compensation. R was measured to be 0.75 Ω. b Overpotentials of Ni foam, CoOOH, RuT/CoOOH, IrV/CoOOH, and RuTIrV/CoOOH at a current density of 10 mA cm−2 in a single experiment. c Polarization curves of RuTIrV/CoOOH and IrTRuV/CoOOH towards oxygen evolution in 1.0 M KOH electrolyte. The inset figure is the overpotentials of RuTIrV/CoOOH and IrTRuV/CoOOH at a current density of 100 mA cm−2. d Mass activities of samples against the mass loadings of Ru and Ir single atoms at an overpotential of 250 mV. e Intrinsic OER activity comparison. The blue, purple, and red columns indicated RuT/CoOOH, IrV/CoOOH, and RuTIrV/CoOOH, respectively. f Chronopotentiometry curves of RuTIrV/CoOOH towards OER at a current density of 10 mA cm−2 and 100 mA cm−2. Schematic diagram of the AEM water electrolyzer (g) and polarization curve of RuTIrV/CoOOH in the AEM water electrolyzer without iR-compensation (h). The white and red spheres represent H and O atoms, respectively. i Chronopotentiometry test of RuTIrV/CoOOH at a current density of 0.5 A cm−2 and 1.0 A cm−2 in the AEM water electrolyzer. Source data are provided as a Source Data file.
