The conjugated oligoelectrolyte DSSN+ enables exceptional coulombic efficiency via direct electron transfer for anode-respiring Shewanella oneidensis MR-1-a mechanistic study

Nathan D. Kirchhofer, Xiaofen Chen, Enrico Marsili, James J. Sumner, Frederick W. Dahlquist, Guillermo C. Bazan

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

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 ∼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

Original languageEnglish
Pages (from-to)20436-20443
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number38
DOIs
Publication statusPublished - Sep 10 2014
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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