Single-chamber microbial electrolysis cells (MECs) seem promising for renewable H 2 generation, because they minimize the ohmic over-potential by eliminating the membrane. However, H 2 produced at the cathode can be consumed by H 2-oxidizing microorganisms in the single-chamber MECs, with CH 4 being a significance H 2 sink. Thus, suppressing methanogenesis is a key for high-yield H 2 production in single-chamber MECs. Anode-respiring bacteria gain energy from the potential difference between donor substrate and their terminal intracellular electron carrier. Anode potential (Eanode) should regulate the potential for the terminal carrier, and the carrier's potential must be more negative than the anode potential to allow electron flow. We evaluated CH 4 formation in a single-chamber MEC at Eanode values from -0.03 to -0.23 V vs. SHE. Electron balances showed that CH4 was the largest electron sink, consuming from 11% to 28% of acetate electrons as E anode was decreased from -0.03 V to -0.23 V.

Original languageEnglish (US)
Title of host publicationACS National Meeting Book of Abstracts
StatePublished - 2010
Event239th ACS National Meeting and Exposition - San Francisco, CA, United States
Duration: Mar 21 2010Mar 25 2010


Other239th ACS National Meeting and Exposition
Country/TerritoryUnited States
CitySan Francisco, CA

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering


Dive into the research topics of 'Anode potential regulates microbial competition between anode-respiring bacteria and methanogens in the biofilm anode'. Together they form a unique fingerprint.

Cite this