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High Biofilm Conductivity Maintained Despite Anode Potential Changes in a Geobacter ‐Enriched Biofilm
Author(s) -
Dhar Bipro Ranjan,
Ryu Hodon,
Ren Hao,
Domingo Jorge W. Santo,
Chae Junkseck,
Lee HyungSool
Publication year - 2016
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201601007
Subject(s) - anode , biofilm , geobacter , geobacter sulfurreducens , kinetics , electron transfer , chemistry , chemical engineering , materials science , electrode , photochemistry , bacteria , biology , physics , quantum mechanics , engineering , genetics
This study systematically assessed intracellular electron transfer (IET) and extracellular electron transfer (EET) kinetics with respect to anode potential ( E anode ) in a mixed‐culture biofilm anode enriched with Geobacter spp. High biofilm conductivity (0.96–1.24 mS cm −1 ) was maintained during E anode changes from −0.2 to +0.2 V versus the standard hydrogen electrode (SHE), although the steady‐state current density significantly decreased from 2.05 to 0.35 A m −2 in a microbial electrochemical cell. Substantial increase of the Treponema population was observed in the biofilm anode at E anode =+0.2 V, which reduced intracellular electron‐transfer kinetics associated with the maximum specific substrate‐utilization rate by a factor of ten. This result suggests that fast EET kinetics can be maintained under dynamic E anode conditions in a highly conductive biofilm anode as a result of shift of main EET players in the biofilm anode, although E anode changes can influence IET kinetics.