Analysis of bio-anode performance through electrochemical impedance spectroscopy
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comunitat-uji-handle2:10234/2507
comunitat-uji-handle3:10234/6973
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Title
Analysis of bio-anode performance through electrochemical impedance spectroscopyAuthor (s)
Date
2015-12Publisher
ElsevierISSN
1567-5394Bibliographic citation
TER HEIJNE, Annemiek, et al. Analysis of bio-anode performance through electrochemical impedance spectroscopy. Bioelectrochemistry, 2015, vol. 106, p. 64-72.Type
info:eu-repo/semantics/articlePublisher version
http://www.sciencedirect.com/science/article/pii/S1567539415000377Version
info:eu-repo/semantics/publishedVersionSubject
Abstract
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 ... [+]
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 Randles 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 Ω·cm2 and 34 Ω·cm2, 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. [-]
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Bioelectrochemistry, 2015, vol. 106Rights
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