Conjugated oligoelectrolyte represses hydrogen oxidation by Geobacter sulfurreducens in microbial electrolysis cells

Jia Liu, Huijie Hou, Xiaofen Chen, Guillermo C. Bazan, Hiroyuki Kashima, Bruce Logan

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

© 2015 Elsevier B.V. A conjugated oligoelectrolyte (COE), which spontaneously aligns within cell membranes, was shown to completely inhibit H2 uptake by Geobacter sulfurreducens in microbial electrolysis cells. Coulombic efficiencies that were 490±95%, due to H2 recycling between the cathode and microorganisms on the anode, were reduced to 86±2% with COE addition. The use of the COE resulted in a 67-fold increase in H2 gas recovery, and a 4.4-fold increase in acetate removal. Current generation, H2 recovery and COD removals by Geobacter metallireducens, which cannot use H2, were unaffected by COE addition. These results show that this COE is an effective H2 uptake inhibitor, and that it can enable improved and sustained H2 gas recovery in this bioelectrochemical system.
Original languageEnglish (US)
Pages (from-to)379-382
Number of pages4
JournalBioelectrochemistry
Volume106
DOIs
StatePublished - Dec 2015
Externally publishedYes

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