Abstract
Bioelectrochemical systems (BES) convert chemical energy into electrical energy (and vice versa) using microorganisms as biocatalysts. Microbial electrolysis cells (MEC) and microbial fuel cells (MFC) are the most well-known BES, with the forms of electron transfer between the microorganism and the electrode, as well as the role of mediators in this process, being the most studied. More r…