Similarly, in the context of H2 production, multiple Tafel regions are observed. Initially, H2 production prevails at low overpotentials, typically -0.3 V and -0.6 V vs RHE. This is attributed to the fact that the necessary potential for catalysing CO2 reduction has not been reached. However, as overpotential increases, the dominance of H2 temporarily diminishes due to the prevailing CO2RR activity blocking active sites that promote HER and suppressing the side reaction. Subsequently, at even higher overpotentials, H2 production shows a resurgence. The presence of multiple kinetic regimes, as observed in Figs. and, requires the generation of several Tafel plots to effectively capture these variations. This results in the classification of different coverage dependent Tafel regions (since coverage varies with voltage), each characterised by its specific exchange current density and transfer coefficient. To accurately establish Tafel slopes that vary with surface coverage, it is imperative to employ rigorous microkinetic models instead of simpler models that make use of conventional assumption of terminal coverages of 𝜃 = 1 or 𝜃 = 0 as pointed out by Shinagawa et al. This approach can be quite complex due to the considerable influence exerted by CO* surface coverage on the energy barrier associated with C-C coupling for C2 intermediates. Also, the possibility of overlapping Tafel plots poses challenges in distinguishing between various kinetic regimes and accurately determining kinetic parameters.