In this study, two novel electrode materials were tested to enhance bacterial adhesion and increase power production in microbial fuel cells (MFCs). Polypyrrole (PPy), a nontoxic conductive polymer, was coated on the plain carbon cloth electrodes to bridge with the biopolymers on bacterial cell membranes and to improve the power production. The PPy-coated electrodes increased the initial power from 20 mW/m2 to 160mW/m2 in the first 4-day period. But there was no clear difference between two PPy coating thicknesses (5-cycle coating and 50-cycle coating) in terms of the bacterial adhesion and power production. Granular activated carbon (GAC), a commonly used bacterial support material with high surface area, exhibited a good bacterial adhesion and high power output. GAC-SCMFCs (single chamber MFCs) generated 5W/m3 and maintained the peak power for 6 days. Compared with plain carbon cloth electrodes, GAC-SCMFCs had lower internal resistances and higher power generations. However, GAC-SCMFCs had lower columbic efficiency and energy conversion efficiency than the conventional two chamber MFCs.

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