Figure 2From: The flat-plate plant-microbial fuel cell: the effect of a new design on internal resistancesTubular (2a) and flat-plate (2b) design of a Plant Microbial Fuel Cell, in which A = anode, C = cathode, M = membrane, d an = average distance between anode and membrane. Distance between anode and membrane is shorter in flat-plate design than in tubular design.Back to article page