Journal
BIOELECTROCHEMISTRY
Volume 106, Issue -, Pages 64-72Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2015.04.002
Keywords
Electrochemical impedance spectroscopy; Internal resistance; Microbial fuel cell; Charge transfer; Diffusion
Funding
- European Union [282970]
- NWO VENI [13631]
- French environmental agency ADEME
- Region Bretagne
- Rennes Metropole
- Dutch Ministry of Economic Affairs
- Ministry of Infrastructure and Environment
- European Union Regional Development Fund
- Province of Fryslan
- Northern Netherlands Provinces
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In this paper we studied the performance of bioanodes under different experimental conditions using polarization curves and impedance spectroscopy. We have identified that the large capacitances of up to 1 mF.cm(-2) for graphite anodes have their origin in the nature of the carbonaceous electrode, rather than the microbial culture. In some cases, the separate contributions of charge transfer and diffusion resistance were clearly visible, while in other cases their contribution was masked by the high capacitance of 1 mF.cm(-2). The impedance data were analyzed using the basic Bandies model to analyze ohmic, charge transfer and diffusion resistances. Increasing buffer concentration from 0 to 50 mM and increasing pH from 6 to 8 resulted in decreased charge transfer and diffusion resistances; lowest values being 144 Omega.cm(2) and 34 Omega.cm(2), respectively. At acetate concentrations below 1 mM, current generation was limited by acetate. We show a linear relationship between inverse charge transfer resistance at potentials close to open circuit and saturation (maximum) current, associated to the Butler-Volmer relationship that needs further exploration. (C) 2015 Elsevier B.V. All rights reserved.
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