In its most basic form, a MFC is a device that uses microorganisms to generate an electrical current
through the oxidation of organic material (Figure 2). Microorganisms in the MFC metabolize organic
substrates and extracellularly transfer electrons to an electrode surface. The oxidation of the organic
material liberates both electrons and protons from the oxidized substrate. Electrons are transferred to
the anode and then to the cathode through an electrical network.