Bioanodes formed with 2D carbon cloth or 3D carbon felt were compared.
Food waste and wastewater were used as the substrate and the medium, respectively.
2D cloth electrodes gave as high current densities than 3D felt electrodes.
The microbial penetration in the 3D structure was limited due to pores clogging.
2D cloth ensured dense filling of the biofilm volume by microbial cells.