Performance of H-shaped membraneless micro fuel cells

► Optimal design of H-shaped membraneless micro fuel cells. ► Fabrication and performance test of H-shaped membraneless micro fuel cells. ► High flow rates increase the maximum current density and decrease fuel utilization. ► Performance of membraneless micro fuel cells increases with increasing the reactant concentrations. ► The mixing region in the downstream section of the H-shaped channel is much smaller than that of a rectangular channel.