title: Systematic screening of carbon-based anode materials for microbial fuel cells with Shewanella oneidensis MR-1.
abstract: We present a systematic screening of carbon-based anode materials for microbial fuel cells with Shewanella oneidensis MR-1. Under anoxic conditions nanoporous activated carbon cloth is a superior anode material in terms of current density normalized to the projected anode area and anode volume (24.0±0.3 μA cm(-2) and 482±7 μA cm(-3) at -0.2 vs. SCE, respectively). The good performance can be attributed to the high specific surface area of the material, which is available for mediated electron transfer through self-secreted flavins. Under aerated conditions no influence of the specific surface area is observed, which we attribute to a shift from primary indirect electron transfer by mediators to direct electron transfer via adherent cells. Furthermore, we show that an aerated initial growth phase enhances the current density under subsequent anoxic conditions fivefold when compared to a similar experiment that was conducted under permanently anoxic conditions.
authors: Laboratory for MEMS Applications, IMTEK - Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany. Electronic address: elena.kipf@imtek.uni-freiburg.de.
authors: Elena
authors: E
authors: Kipf
authors: Laboratory for MEMS Applications, IMTEK - Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany.
authors: Julia
authors: J
authors: Koch
authors: Laboratory for MEMS Applications, IMTEK - Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany.
authors: Bettina
authors: B
authors: Geiger
authors: Laboratory for MEMS Applications, IMTEK - Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany. Electronic address: johannes.erben@imtek.uni-freiburg.de.
authors: Johannes
authors: J
authors: Erben
authors: Institute for Applied Biosciences, Department of Applied Biology, Karlsruhe Institute of Technology, Fritz-Haber-Weg 2, 76131 Karlsruhe, Germany. Electronic address: katrin.richter@kit.edu.
authors: Katrin
authors: K
authors: Richter
authors: Institute for Applied Biosciences, Department of Applied Biology, Karlsruhe Institute of Technology, Fritz-Haber-Weg 2, 76131 Karlsruhe, Germany. Electronic address: johannes.gescher@kit.edu.
authors: Johannes
authors: J
authors: Gescher
authors: Laboratory for MEMS Applications, IMTEK - Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany; BIOSS - Centre for Biological Signalling Studies, University of Freiburg, 79110 Freiburg, Germany. Electronic address: zengerle@imtek.uni-freiburg.de.
authors: Roland
authors: R
authors: Zengerle
authors: Laboratory for MEMS Applications, IMTEK - Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany. Electronic address: kerzenma@imtek.uni-freiburg.de.
authors: Sven
authors: S
authors: Kerzenmacher
mesh_terms: D001674:Bioelectric Energy Sources; D002244:Carbon / Q000737:chemistry*; D004566:Electrodes; D006108:Graphite / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D060106:Lakes; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D010100:Oxygen / Q000737:chemistry; D020592:Shewanella / Q000378:metabolism*; D013499:Surface Properties; D013997:Time Factors; D062065:Wastewater; D018508:Water Purification / Q000379:methods
chemical_list: D002244:Carbon; D006108:Graphite; D010100:Oxygen; D062065:Wastewater
keywords: Activated carbon cloth; Aeration; Anode materials; Microbial fuel cells; Shewanella oneidensis