fig8
Figure 8. (A and B) SEM-EDS image of cathode electrode of PMMFCs with NF-GO-L after adsorption experiment; (C and D) SEM-EDS image of cathode electrode of PMMFCs with NF-GO-H after adsorption experiment. PMMFCs: Photosynthetic microalgae microbial fuel cells; SEM-EDS: scanning electron microscope - Energy dispersive spectrometer.