We first sought to assess whether the bulk electrolyte concentration and the boundary-layer thickness are correlated with the fitted transfer coefficients and exchange current densities, which should be intrinsic to the catalyst. Figure confirms that the lack of correlation between these parameters for all the fitted data. We next explored the correlation between the fitted values of 𝛼 $ and 𝑖 " for each reaction. The parameters 𝛼 $ and log '" (𝑖 " ) should exhibit a negative, linear correlation with the slope of the correlation line related to the reaction order of the reactant and product species and their activity in the bulk electrolyte because the expression for 𝑖 " is referenced to the activities of species in the bulk electrolyte (Section S14.2 of the SI). While a negative correlation is observed for both reactions (Figure ), the slopes are much more negative than would be expected from the analysis given in Section S14.2 of the SI Additionally, these data were carried out using different bulk electrolyte concentrations and Ag electrodes having different roughness factors. As can be seen in Equation S83 both factors impact the exchange current density. These effects are not explicitly deconvoluted from the correlation observed in Figure