Figure 19.

Comparison of mass activities (j_mass) reported for commercial Ir-oxide powder catalysts versus the corresponding overpotential (η). Both j_mass and the corresponding η values were measured at 10 mA/cm_geom². (b) Enlarged version of (a) demonstrating the variability in the reported data for the lower η range. Details of the Ir-oxide mass loadings on the electrodes and references are given in Table S6. The majority of the Ir-oxides were reported to be IrO₂, with the exception of two oxides that are referred to as IrO_x, as indicated in (a).