The estimated value of f should be the smallest root value after solving the cubic polynomial in Eq. 53. The value of the overlapping ration, f, is substituted into Eq. 54 to calculate the specific surface area of the catalyst layer. involved in the electrocatalytic reduction of CO2 and facilitating the upscaling of these insights to the macroscopic scale. This is because kinetic parameters governing the elementary steps correspond to formation and breaking of chemical bonds, which occur at a microscale level. Given the complexity of the reaction on Cu electrodes, a rigorous approach is adopted rather than selecting a limited number of presumed key reaction mechanisms, as has been done in recent literature. The microkinetic model employed in this study encompasses a broad reaction network, incorporating possible feasible and commonly observed elementary reaction events documented on Cu(100), an extensively studied facet in Cu electrocatalysis for CO2 reduction, sourced from a variety of experimental and ab initio studies. The interactions among these steps contribute to the development of the predominant catalytic reaction mechanism amounting to 77 functional reaction elementary steps. Both the continuum and microkinetic models allow for effective capture of temporal changes in reaction rates and species concentrations on the electrode. However, in our case, the use of the development of dynamic models for both mass transport and micro-kinetics, provided that effective management of time intervals can be achieved.