It is well-known that one of the key parameters that affect product distribution is the applied The first pathway, associated with the low voltage C2 chemistry, has been demonstrated to involve a coupling reaction with no proton transfer rate determining step (i.e., pH independent), but rather an electron transfer (rate determining step of C-C coupling). In contrast, the latter pathway, corresponding to the high-voltage C1/C2 chemistry, features a pH-dependent ratedetermining step (RDS) that involves the transfer of both protons and electrons. The applied voltage region studied in the MKM used for this work is between -0.85 V to  -1.25 V which is within the moderate voltage (-0.7 V to -1.0 V) to high voltage region (> -1.0 V). Therefore, the low voltage C2 chemistry, which selectively takes place on Cu(100), is not analysed in this work since it is outside the studied voltage range. This can be expanded in future microkinetic -mass transport models when a wider range of voltages and reactant concentrations will have been investigated in a microkinetic model.