Bacterial extracellular electron transfer in bioelectrochemical systems

Electrode materials for microbial fuel cells: nanomaterial approach

“…The outer membrane cytochrome (C-type) is involved in the direct transfer of electrons produced from NADH [14]. Electron transfer through mediators: Few genera of bacteria such as Shewanella and Pseudomonas secrete some chemical species such as flavins called shuttle molecules to transfer electrons from the outer membrane of bacteria to electrodes [15,16].…”

Performance and recent improvement in microbial fuel cells for simultaneous carbon and nitrogen removal: A review

“…Direct electron transfer (DET) refers to electrons transferred by c-type cytochromes (CTCs), flavin bound to c-type cytochromes and conductive pili, which may serve as biological nanowires (Fig. 2) (Debabov, 2008;Yang et al, 2012;Reguera et al, 2005;Okamoto et al, 2014a;Okamoto et al, 2014b). Mediated electron transfer (MET) means the addition of external electron mediators to shuttle electrons between electrodes and microorganisms that are unable to carry electrons directly to the electrodes (Lovley, 2006;Mook et al, 2013b).…”

Probing single- to multi-cell level charge transport in Geobacter sulfurreducens DL-1

“…The fundamental design behind MFCs has led to systems that can generate hydrogen 8 or electricity directly from aquatic sediments 9 . Electrochemically active bacteria (EAB), such as Shewanella and Geobacter, can transfer electrons from oxidative metabolism of organic sources to electrodes through reduced outer membrane proteins or soluble redox mediators 2,[10][11][12] . Although considerable progress has been made in improving MFC performance through the optimization of microbe selection 13,14 and fuel cell design 7,15 , the complex nature of biofilms in working MFCs has hindered a detailed understanding of charge transport at microbe/electrode and microbe/microbe interfaces [16][17][18][19] .…”