Due to the carbon cathode having a higher surface area than the stainless steel mesh employed by Fu et al. , we expected that the optimal operating current density would be higher for carbon. The complexity of the system and interplay between multiple parameters (current density, pulsing conditions and ethanol) results in a large space to be explored to optimise the Faradaic efficiency. We have conducted a preliminary screening of these conditions by operating at various current densities, pulse durations and ethanol concentrations. By varying these parameters, significant improvements in Faradaic efficiency were measured of up to 37 % Faradaic efficiency at -18 mA cm -2 geo and 0.40 vol. % EtOH (Figure ). These results highlight that further studies could engender significant improvements in Faradaic efficiency by optimising these operating conditions.