Bioelectricity Generation in a Microbial Fuel Cell with a Self-Sustainable Photocathode

Figure 5

Changes in dissolved oxygen concentration (a) and pH (b) of the cathode electrolyte during illumination and dark circulation. (The symbols of moon and sun represent light and dark conditions, resp.). (Black line: CO₂ was allowed to travel through the tube; red line: CO₂ travel through the silicon tube was blocked.)

(a)

(b)