In this work, we focus on the high voltage C1/C2 pathway. Given that the electrochemical reduction of CO2 commences with generation of formate and CO, we observe Faradaic efficiencies of these products to be higher in the medium voltage region (-0.7 to -0.9 V) as shown in Fig. , with the Faradaic efficiency of formate is higher than that of CO. The relatively higher negative applied voltage within this range facilitates overcoming the initial high energy barrier (ΔG ⧧ =0.80 eV) for formate production as opposed to the lower barrier of 0.43 eV for CO. Meanwhile, even though the proton-electron energy barrier of CO is low, CO is consumed as it is generated since it serves as an important intermediate to produce C1 and C2+ products compared to formate, which is a final product. More importantly, using GDEs allows the readsorption of *CO intermediate along the length of the porous catalytic bed which further improves the selectivity towards C1 and C2+ products. This is as a result of increased surface area (compared to planar electrode) lengthening the escape route for CO. However, this effect is subject to the characteristic surface area of the GDE. 6b and 7b that ethanol is part of the minor products generated if there are no reactant CO2 mass transport limitations. The results also show that methane and ethylene are the major products produced after hydrogen within the high voltage region (Fig. ), albeit methane is produced in larger quantities due to the relatively lower proton/electron requirement, first order dependence, and relatively lower energy barrier for methane production compared to that required for ethylene/ethanol production. Furthermore, apart from the impact of the different voltage regions, the coverage of CO* (Fig with the low-voltage C2 pathway and serves as a major reactant to produce methanol. As such, methanol is also observed to have an appreciable current density competing with ethylene and methane formation in the high voltage region due to the necessary electrode voltage of -1.12 V vs RHE required to produce methanol from CH3O*. One notable pattern in the Faradaic efficiencies shown in Figs. 7a and 7b is the direct relationship between production of hydrocarbons (ethanol, formaldehyde, formate, ethylene) and the reduction in the production of hydrogen. As production of methane and ethylene commences at -1.0 V, hydrogen evolution diminishes, reaching a notable low Faradaic efficiency of 50%, whilst that of methane peaks at 50% at an applied voltage of -1.15 V. At higher negative voltage, production of hydrogen rises again, triggered by the lowering of production of hydrocarbons at higher voltages, partly due to the mass transport limitations of CO2. Since this is the case, the Tafel slope of H2 is always affected by increase or decline in the rate of production of hydrocarbons.