Design rules for electrode arrangement in an air-breathing alkaline direct methanol laminar flow fuel cell

► Experimentally investigated the relationship between electrode length and current density for a range of reactant flow rates. ► Highlighted the effect of electrode aspect ratio on performance, specifically current density. ► Systematically investigated how to achieve 75% fuel conversion using minimum number of electrodes and electrode area. ► Analysis can be applied to many other microfluidic electrochemical reactors.