Abstract: Carbon fiber brush is taken as the modification object to improve its power generation performance to solve the low output power problem of microbial fuel cells.Polypyrrole film grows on the surface of carbon fiber by employing in-situ chemical polymerization method, which enhances significantly the biocompatibility of the electrode, and it is conducive to the attachment and reproduction of electricity producing microorganisms on the electrode surface.Furthermore, the addition of graphene on the surface of carbon fiber improves the specific surface area and conductivity of the electrode.Under the synergistic effect of polypyrrole and graphene, the power generation performance of microbial fuel cells is greatly improved.The maximum output voltage and maximum output power density can reach 0.62 V and 900 mW·m-2, respectively, which are nearly 24% and 133% higher than that of unmodified carbon brush.
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