Abstract

The electrical conductivity of a Geobacter-enriched biofilm anode fed with acetate medium was assessed using small gold electrode systems as substrate concentration was changed. At 1.86 A/m2 of the steady-state current density, biofilm conductivity was stable at 0.48–0.51 mS/cm. This high biofilm conductivity was not changed at short-term starvation (< 7 h). In comparison, biofilm conductivity significantly decreased down to 0.16 ± 0.002 mS/cm after 4 d of long-term starvation (current density 0.03 ± 0.01 A/m2). Biofilm conductivity, however, was recovered to 0.35 ± 0.03 mS/cm after 25 mM acetate spiking in a few days. The decrease and increase of biofilm conductivity in response to substrate conditions for long-term starvation was consistently observed in three consecutive cycles. This dynamic biofilm conductivity indirectly indicates that catabolism of exoelectrogens (i.e., energy generation) is associated with biofilm conductivity.

Original languageEnglish (US)
Pages (from-to)198-202
Number of pages5
JournalJournal of Power Sources
Volume402
DOIs
StatePublished - Oct 31 2018

Keywords

  • Biofilm conductivity
  • Energy generation
  • Exoelectrogens
  • Extracellular electron transfer
  • Starvation
  • Substrate limitations

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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