Correspondingly, cardinal values for the Tafel slope (Equation S82) are 118, 59, 39, etc. Crucially, the symmetry factor, which is defined as the fraction of the applied overpotential that goes towards lowering the barrier of the cathodic reaction (as opposed to the anodic reaction), will likely not be 0.5 for inner sphere electrochemical reactions such as CO2R and HER on Ag, where some potential is lost in the double layer, and the reaction intermediate is likely not equidistant in free energy from the reactants or products. Nonetheless, many theoretical studies have employed the cardinal value of 0.5 for CO2R. It is also notable that the theoretical work of note that all fitted parameters lie within a range of physically acceptable values, and possess a tighter range than those previously reported for continuum models. Additionally, the most probable values of the kinetic parameters for both CO and H2 (determined as the maxima of the KDEs (see Table )) lie relatively close to the values reported by Singh et al. that were obtained via DFT of CO2R and HER on Ag (110) (difference of 0.11 for 𝛼 +, , difference of 0.05 for the Volmer step 𝛼 . ! ). Notably, though, for HER, both DFT and the analysis of the KDE suggest transfer coefficients far from cardinality (much less than 0.5). Furthermore, the maximum value of the KDE for 𝛼 $,. ! lies close to that predicted by Singh for the Volmer step; whereas the Heyrovsky step was proposed to be rate limiting in that work. This discrepancy may be due to additional proton sources for the HER other than water (such as HCO3 -anions), and future work should aim to develop a better physical model for HER in order to deconvolute these effects.