Current generation in microbial electrolysis cells with addition of amorphous ferric hydroxide, Tween 80, or DNA

Handle URI:
http://hdl.handle.net/10754/597913
Title:
Current generation in microbial electrolysis cells with addition of amorphous ferric hydroxide, Tween 80, or DNA
Authors:
Ren, Lijiao; Tokash, Justin C.; Regan, John M.; Logan, Bruce E.
Abstract:
Iron-oxide nanoparticles and the Tween 80 have previously been shown to improve power generation in microbial fuel cells (MFCs), presumably by improving electron transfer from the bacteria to the anode. We examined whether several chemicals would affect current production in single-chamber microbial electrolysis cells (MECs), where hydrogen gas is produced at the cathode, using mixed cultures and Geobacter sulfurreducens. Tween 80 did not increase the current. Fe(OH) 3 addition increased the maximum current density of both the mixed cultures (from 6.1 ± 0.9 A/m 2 to 8.8 ± 0.3 A/m 2) and pure cultures (from 4.8 ± 0.5 A/m 2 to 7.4 ± 1.1 A/m 2). Improved current production was sustained even after iron was no longer added to the medium. It was demonstrated that increased current resulted from improved cathode performance. Analysis using electrochemical impedance spectroscopy (EIS) showed that the iron primarily reduced the diffusion resistances of the cathodes, and scanning electron microscopy (SEM) images showed the formation of highly porous structures on the cathode. The addition of DNA also did not improve MEC or MFC performance. These results demonstrated that among these treatments only Fe(OH) 3 addition was a viable method for enhancing current densities in MECs, primarily by improving cathode performance. Copyright © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights.
Citation:
Ren L, Tokash JC, Regan JM, Logan BE (2012) Current generation in microbial electrolysis cells with addition of amorphous ferric hydroxide, Tween 80, or DNA. International Journal of Hydrogen Energy 37: 16943–16950. Available: http://dx.doi.org/10.1016/j.ijhydene.2012.08.119.
Publisher:
Elsevier BV
Journal:
International Journal of Hydrogen Energy
KAUST Grant Number:
KUS-I1-003-13
Issue Date:
Nov-2012
DOI:
10.1016/j.ijhydene.2012.08.119
Type:
Article
ISSN:
0360-3199
Sponsors:
The authors thank David Jones for help with the analytical measurements. This research is supported by Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST).
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorRen, Lijiaoen
dc.contributor.authorTokash, Justin C.en
dc.contributor.authorRegan, John M.en
dc.contributor.authorLogan, Bruce E.en
dc.date.accessioned2016-02-25T12:58:47Zen
dc.date.available2016-02-25T12:58:47Zen
dc.date.issued2012-11en
dc.identifier.citationRen L, Tokash JC, Regan JM, Logan BE (2012) Current generation in microbial electrolysis cells with addition of amorphous ferric hydroxide, Tween 80, or DNA. International Journal of Hydrogen Energy 37: 16943–16950. Available: http://dx.doi.org/10.1016/j.ijhydene.2012.08.119.en
dc.identifier.issn0360-3199en
dc.identifier.doi10.1016/j.ijhydene.2012.08.119en
dc.identifier.urihttp://hdl.handle.net/10754/597913en
dc.description.abstractIron-oxide nanoparticles and the Tween 80 have previously been shown to improve power generation in microbial fuel cells (MFCs), presumably by improving electron transfer from the bacteria to the anode. We examined whether several chemicals would affect current production in single-chamber microbial electrolysis cells (MECs), where hydrogen gas is produced at the cathode, using mixed cultures and Geobacter sulfurreducens. Tween 80 did not increase the current. Fe(OH) 3 addition increased the maximum current density of both the mixed cultures (from 6.1 ± 0.9 A/m 2 to 8.8 ± 0.3 A/m 2) and pure cultures (from 4.8 ± 0.5 A/m 2 to 7.4 ± 1.1 A/m 2). Improved current production was sustained even after iron was no longer added to the medium. It was demonstrated that increased current resulted from improved cathode performance. Analysis using electrochemical impedance spectroscopy (EIS) showed that the iron primarily reduced the diffusion resistances of the cathodes, and scanning electron microscopy (SEM) images showed the formation of highly porous structures on the cathode. The addition of DNA also did not improve MEC or MFC performance. These results demonstrated that among these treatments only Fe(OH) 3 addition was a viable method for enhancing current densities in MECs, primarily by improving cathode performance. Copyright © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights.en
dc.description.sponsorshipThe authors thank David Jones for help with the analytical measurements. This research is supported by Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST).en
dc.publisherElsevier BVen
dc.subjectAmorphous ferric hydroxideen
dc.subjectDNAen
dc.subjectMicrobial electrolysis cellsen
dc.subjectTween 80en
dc.titleCurrent generation in microbial electrolysis cells with addition of amorphous ferric hydroxide, Tween 80, or DNAen
dc.typeArticleen
dc.identifier.journalInternational Journal of Hydrogen Energyen
dc.contributor.institutionPennsylvania State University, State College, United Statesen
kaust.grant.numberKUS-I1-003-13en
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