1 Introduction</h5> Microbial fuel cell (MFC) is a bioelectrochemical system that converts chemical energy in organic matters into electrical energy by catalysis of microorganisms [1–3] . As a novel biotechnology for wastewater treatment, renewable energy production, biosensor, bioremediation and chemical synthesis, MFC has drawn much attention and has achieved great progress in the past decade [4–8] . Currently, one of the main challenges for improving MFC applications is to increase the electron recovery from the substrates (coulombic efficiency, CE) as the CE of MFCs is still too low [9–13] . The CE, defined as the ratio of the amount of electrons transferred through the circuit to the amount of electrons theoretically delivered by the substrate, is one of the most important criteria for MFC performance evaluation. The CE is mainly diminished by growth and reproduction of microorganisms, competitive processes such as fermentation, and aerobic respiration due to the diffusing of oxygen into the anode chamber [10,14] . Therefore, it is of great significance to address these challenges to enhance CE in order to create efficient MFCs for these applications.</P>Coulombic efficiency typically depends on the electrolyte composition, inocula, reactor design and operation  . Previous studies demonstrates that biofilm
Journal of Power Sources – Elsevier
Published: Dec 5, 2014
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