Abstract Corncob pyrochar activated with steam (CCA) and nonactivated corncob (NCC) were produced characterized. The performance of the best material was tested in a dual‐chambered microbial fuel cell (MFC) as an electrode for bioelectricity generation using wet torrefaction wastewater substrate. Pyrolysis 80.3 g dried corncobs carried out at 600°C under constant N 2 flow 3 L min −1 30 resultin...