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Title (Primary) Redox potential heterogeneity in fixed bed electrodes leads to microbial stratification and inhomogeneous performance
Author Rodrigo Quejigo, J.; Korth, B.; Kuchenbuch, A.; Harnisch, F.;
Journal ChemSusChem
Year 2021
Department UMB;
Volume 14
Issue 4
Language englisch;
POF III (all) R31; T15;
Supplements https://chemistry-europe.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1002%2Fcssc.202002611&file=cssc202002611-sup-0001-misc_information.pdf
Keywords electron transfer; electrochemical analysis; cyclic voltammetry; 3D-printing; bed electrode
Abstract Bed electrodes provide high electrode area‐to‐volume ratios representing a promising configuration for transferring bioelectrochemical systems close to industrial applications. Nevertheless, the intrinsic electrical resistance leads to a poor polarization behavior. Therefore, the distribution of Geobacter spp. and their electrochemical performance within exemplary fixed bed electrodes were investigated. A minimally invasive sampling system allowed characterization of granules from different spatial locations of bed electrodes. Cyclic voltammetry of single granules (n=63) demonstrated that the major share of electroactivity (134.3 mA L −1 ) was achieved by ca. 10% of bed volume, specifically that being close to the current collector. Nevertheless, analysis of the microbial community revealed that Geobacter spp. dominated all sampled granules. These findings clearly demonstrate the need for engineered bed electrodes to improve electron exchange between microorganisms and granules.
ID 24053
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=24053
Rodrigo Quejigo, J., Korth, B., Kuchenbuch, A., Harnisch, F. (2021):
Redox potential heterogeneity in fixed bed electrodes leads to microbial stratification and inhomogeneous performance
ChemSusChem 14 (4), 1155 - 1165