Fig. 8
From: Scaling-up of a novel, simplified MFC stack based on a self-stratifying urine column
a Electrical outputs of the serial connections of increasing numbers of units in a single cascade. Resistances were set from the result of the first polarisation sweep. b Polarisation sweep of the cascade comprising four units connected in series. c Polarisation sweep of individual stack within the cascade. The dotted squares indicate the last points, prior to a non-planned refuelling, that are considered as the maximum power points. Each resistor, ranging from 30 k to 11 Ω, was connected for a period of 10 min