The conjugated oligoelectrolyte DSSN+ enables exceptional coulombic efficiency via direct electron transfer for anode-respiring Shewanella oneidensis MR-1-a mechanistic study.
Phys Chem Chem Phys
; 16(38): 20436-43, 2014 Oct 14.
Article
em En
| MEDLINE
| ID: mdl-25171764
ABSTRACT
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 â¼2.2-fold increase in charge collected, a â¼3.1-fold increase in electrode colonization by S. oneidensis, and a â¼1.7-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.
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Base de dados:
MEDLINE
Assunto principal:
Fontes de Energia Bioelétrica
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Shewanella
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Eletrodos
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Eletrólitos
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article