Fig. 2
From: Scaling-up of a novel, simplified MFC stack based on a self-stratifying urine column
Voltage monitoring of two independent MFCs submerged in the same liquid. Each MFC was loaded with a 600-Ω resistor. a Star indicates when only one of the two MFCs was put in open circuit. The blue dotted line is the voltage monitoring when the two MFCs were electrically connected in series (double star, 1200 Ω resistor). b The arrows indicate when the resistive loads were swapped between 600 and 400 Ω. Data show the independent electrical behaviours of both MFCs