Use of low cost and easily regenerated Prussian Blue cathodes for efficient electrical energy recovery in a microbial battery

摘要: Microbial fuel cells can directly convert chemical energy into electrical energy, but significant losses result from the use of O2 as cathode. batteries (MBs) replace conventional cathodes with solid-state that be re-oxidized under favorable conditions, enabling more efficient recovery. Previously, we demonstrated proof-of-concept for MBs a silver oxide The high cost and required re-oxidation make this material impractical. In work, evaluate Prussian Blue (PB), hexacyano-Fe complex material, low-cost cathode in single-chamber, membrane-free MB. oxidation organic matter at anode drives reduction PB. Reduced PB is by exposure to air. equipped electrode efficiently transfer charge (85% transfer), achieving net recovery efficiencies 18–33%, no loss capacity over 20 cycles operation. operating potential creates trade-off: increasing improves efficiency recovery, maintain power output ensure matter. Operation otherwise straightforward: only move reduced air then back We conclude promising MBs.