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![Graphene oxide modified electrode enhances electricity generation and heavy metal removal in photosynthetic microalgae microbial fuel cells](https://image.oaes.cc/f3ff2c02-525b-4e00-b653-e3982a1b60db/5510.fig.4.jpg)
Figure 4. (A and B) SEM image of cathode (left) and anode (right) of PMMFCs with NF-GO-H electrode; (C and D) SEM image of cathode (left) and anode (right) of PMMFCs with NF-GO-L electrode. PMMFCs: Photosynthetic microalgae microbial fuel cells; SEM: scanning electron microscope.