Conventional microbial fuel cells (MFCs) consist of biological anodes and abiotic cathodes separated by a proton‐exchange membrane. The abiotic cathode usually catalyses the reduction of oxygen to produce water by means of expensive catalysts such as platinum. 1 The cathodic reaction is often limiting in MFCs and researchers are now focusing on efficient, low‐cost catalysts to improve oxygen reduction at the cathode. This pape...