Garden compost inoculum leads to microbial bioanodes with potential-independent characteristicsReport as inadecuate

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1 LGC - Laboratoire de génie chimique 2 LEMIRE - Laboratoire d-Ecologie Microbienne de la Rhizosphère et d-Environnements Extrêmes

Abstract : Garden compost leachate was used to form microbial bioanodes under polarization at 0.4, 0.2 and +0.1 V-SCE. Current densities were 6.3 and 8.9 A m2 on average at 0.4 and +0.1 V-SCE respectively, with acetate 10 mM. The catalytic cyclic voltammetry CV showed similar electrochemical characteristics for all bioanodes and indicated that the lower currents recorded at 0.4 V-SCE were due to the slower interfacial electron transfer rate at this potential, consistently with conventional electrochemical kinetics.RNA- and DNA-based DGGE evidenced that the three dominant bacterial groups Geobacter, Anaerophaga and Pelobacter were identical for all bioanodes and did not depend on the polarization potential. Only non-turnover CVs showed differences in the redox equipment of the biofilms, the highest potential promoting multiple electron transfer pathways. This first description of a potential-independent electroactive microbial community opens up promising prospects for the design of stable bioanodes for microbial fuel cells.

keyword : Bioanode Microbial anode Potential DGGE Microbial fuel cell

Author: Bibiana Cercado Quezada - Nathalie Byrne - Marie Bertrand - Diana Pocaznoi - Mickaël Rimboud - Wafa Achouak - Alain Bergel -



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