Dynamic potential-dependent electron transport pathway shifts in anode biofilms of Geobacter sulfurreducens

Rachel A. Yoho, Sudeep C. Popat, Cesar Torres

Research output: Contribution to journalArticlepeer-review

60 Scopus citations


Biofilms of the anode-respiring bacterium Geobacter sulfurreducens (G. sulfurreducens) demonstrate dynamic potential-dependent changes between two electron transport pathways that are used selectively depending on the anode potential. Electrochemical impedance spectroscopy (EIS) measurements suggest that these pathways (both n = 1), with midpoint potentials of -0.155 (± 0.005) and -0.095 (± 0.003) V versus standard hydrogen electrode, are not additive within the biofilm, but are preferentially used depending on the anode potential. Potential step voltammetry and cyclic voltammetry (CV) confirmed rapid changes between the two pathways in minutes when the anode potential is changed. We confirm that the electrochemical response observed in a slow-scan-rate CV (∼ 1 mVs-1) is often composed of at least the two pathways characterized. Thus, beyond understanding the electron transport pathways in G. sulfurreducens, this study also has implications on the interpretation of previously collected and future potential-dependent datasets.

Original languageEnglish (US)
Pages (from-to)3413-3419
Number of pages7
Issue number12
StatePublished - Dec 2014


  • Anodes
  • Biofilms
  • Cyclic voltammetry
  • Electrochemical impedance spectroscopy
  • Electron transport

ASJC Scopus subject areas

  • Environmental Chemistry
  • General Chemical Engineering
  • General Materials Science
  • General Energy


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