Improved performance of microbial fuel cell using combination biocathode of graphite fiber brush and graphite granules

► Combination of graphite fibre brush (GBF) and graphite granule (GGs) as cathode material. ► Favorable enrichment of electrochemically active bacteria on the cathode. ► Significant improvement of power density and coulombic efficiency. ► Domination of Nitrobacter sp., Achromobacter sp., and Acinetobacter sp. in cathode.