TY - JOUR
T1 - The conjugated oligoelectrolyte DSSN+ enables exceptional coulombic efficiency via direct electron transfer for anode-respiring Shewanella oneidensis MR-1-a mechanistic study
AU - Kirchhofer, Nathan D.
AU - Chen, Xiaofen
AU - Marsili, Enrico
AU - Sumner, James J.
AU - Dahlquist, Frederick W.
AU - Bazan, Guillermo C.
PY - 2014/9/10
Y1 - 2014/9/10
N2 - Shewanella oneidensis MR-1 was cultivated on lactate with poised graphite electrode acceptors (E = +0.2 V vs. Ag/AgCl) in order to explore the basis for sustained increases in anodic current output following the addition of the lipid-intercalating conjugated oligoelectrolyte (COE), 4,4′-bis(4′-(N, N-bis(6′′-(N, N, N-trimethylammonium)hexyl)amino)-styryl)stilbene tetraiodide (DSSN+). Microbial cultures, which were spiked with DSSN+, exhibit a ∼2.2-fold increase in charge collected, a ∼3.1-fold increase in electrode colonization by S. oneidensis, and a ∼1.7-fold increase in coulombic efficiency from 51 ± 10% to an exceptional 84 ± 7% without obvious toxicity effects. Direct microbial biofilm voltammetry reveals that DSSN+ rapidly and sustainably increases cytochrome-based direct electron transfer and subsequently increases flavin-based mediated electron transfer. Control experiments indicate that DSSN+ does not contribute to the current in the absence of bacteria. _copy This journal is
AB - Shewanella oneidensis MR-1 was cultivated on lactate with poised graphite electrode acceptors (E = +0.2 V vs. Ag/AgCl) in order to explore the basis for sustained increases in anodic current output following the addition of the lipid-intercalating conjugated oligoelectrolyte (COE), 4,4′-bis(4′-(N, N-bis(6′′-(N, N, N-trimethylammonium)hexyl)amino)-styryl)stilbene tetraiodide (DSSN+). Microbial cultures, which were spiked with DSSN+, exhibit a ∼2.2-fold increase in charge collected, a ∼3.1-fold increase in electrode colonization by S. oneidensis, and a ∼1.7-fold increase in coulombic efficiency from 51 ± 10% to an exceptional 84 ± 7% without obvious toxicity effects. Direct microbial biofilm voltammetry reveals that DSSN+ rapidly and sustainably increases cytochrome-based direct electron transfer and subsequently increases flavin-based mediated electron transfer. Control experiments indicate that DSSN+ does not contribute to the current in the absence of bacteria. _copy This journal is
UR - http://www.scopus.com/inward/record.url?scp=84907486517&partnerID=8YFLogxK
U2 - 10.1039/c4cp03197k
DO - 10.1039/c4cp03197k
M3 - Article
C2 - 25171764
AN - SCOPUS:84907486517
SN - 1463-9076
VL - 16
SP - 20436
EP - 20443
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
IS - 38
ER -