Altering Anode Thickness To Improve Power Production in Microbial Fuel Cells with Different Electrode Distances

Handle URI:
http://hdl.handle.net/10754/597494
Title:
Altering Anode Thickness To Improve Power Production in Microbial Fuel Cells with Different Electrode Distances
Authors:
Ahn, Yongtae; Logan, Bruce E.
Abstract:
A better understanding of how anode and separator physical properties affect power production is needed to improve energy and power production by microbial fuel cells (MFCs). Oxygen crossover from the cathode can limit power production by bacteria on the anode when using closely spaced electrodes [separator electrode assembly (SEA)]. Thick graphite fiber brush anodes, as opposed to thin carbon cloth, and separators have previously been examined as methods to reduce the impact of oxygen crossover on power generation. We examined here whether the thickness of the anode could be an important factor in reducing the effect of oxygen crossover on power production, because bacteria deep in the electrode could better maintain anaerobic conditions. Carbon felt anodes with three different thicknesses were examined to see the effects of thicker anodes in two configurations: widely spaced electrodes and SEA. Power increased with anode thickness, with maximum power densities (604 mW/m 2, 0.32 cm; 764 mW/m2, 0.64 cm; and 1048 mW/m2, 1.27 cm), when widely spaced electrodes (4 cm) were used, where oxygen crossover does not affect power generation. Performance improved slightly using thicker anodes in the SEA configuration, but power was lower (maximum of 689 mW/m2) than with widely spaced electrodes, despite a reduction in ohmic resistance to 10 Ω (SEA) from 51-62 Ω (widely spaced electrodes). These results show that thicker anodes can work better than thinner anodes but only when the anodes are not adversely affected by proximity to the cathode. This suggests that reducing oxygen crossover and improving SEA MFC performance will require better separators. © 2012 American Chemical Society.
Citation:
Ahn Y, Logan BE (2013) Altering Anode Thickness To Improve Power Production in Microbial Fuel Cells with Different Electrode Distances. Energy Fuels 27: 271–276. Available: http://dx.doi.org/10.1021/ef3015553.
Publisher:
American Chemical Society (ACS)
Journal:
Energy & Fuels
KAUST Grant Number:
KUS-I1-003-13
Issue Date:
17-Jan-2013
DOI:
10.1021/ef3015553
Type:
Article
ISSN:
0887-0624; 1520-5029
Sponsors:
The research reported here was supported by the Siemens Corporation and 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.authorAhn, Yongtaeen
dc.contributor.authorLogan, Bruce E.en
dc.date.accessioned2016-02-25T12:40:50Zen
dc.date.available2016-02-25T12:40:50Zen
dc.date.issued2013-01-17en
dc.identifier.citationAhn Y, Logan BE (2013) Altering Anode Thickness To Improve Power Production in Microbial Fuel Cells with Different Electrode Distances. Energy Fuels 27: 271–276. Available: http://dx.doi.org/10.1021/ef3015553.en
dc.identifier.issn0887-0624en
dc.identifier.issn1520-5029en
dc.identifier.doi10.1021/ef3015553en
dc.identifier.urihttp://hdl.handle.net/10754/597494en
dc.description.abstractA better understanding of how anode and separator physical properties affect power production is needed to improve energy and power production by microbial fuel cells (MFCs). Oxygen crossover from the cathode can limit power production by bacteria on the anode when using closely spaced electrodes [separator electrode assembly (SEA)]. Thick graphite fiber brush anodes, as opposed to thin carbon cloth, and separators have previously been examined as methods to reduce the impact of oxygen crossover on power generation. We examined here whether the thickness of the anode could be an important factor in reducing the effect of oxygen crossover on power production, because bacteria deep in the electrode could better maintain anaerobic conditions. Carbon felt anodes with three different thicknesses were examined to see the effects of thicker anodes in two configurations: widely spaced electrodes and SEA. Power increased with anode thickness, with maximum power densities (604 mW/m 2, 0.32 cm; 764 mW/m2, 0.64 cm; and 1048 mW/m2, 1.27 cm), when widely spaced electrodes (4 cm) were used, where oxygen crossover does not affect power generation. Performance improved slightly using thicker anodes in the SEA configuration, but power was lower (maximum of 689 mW/m2) than with widely spaced electrodes, despite a reduction in ohmic resistance to 10 Ω (SEA) from 51-62 Ω (widely spaced electrodes). These results show that thicker anodes can work better than thinner anodes but only when the anodes are not adversely affected by proximity to the cathode. This suggests that reducing oxygen crossover and improving SEA MFC performance will require better separators. © 2012 American Chemical Society.en
dc.description.sponsorshipThe research reported here was supported by the Siemens Corporation and Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST).en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleAltering Anode Thickness To Improve Power Production in Microbial Fuel Cells with Different Electrode Distancesen
dc.typeArticleen
dc.identifier.journalEnergy & Fuelsen
dc.contributor.institutionPennsylvania State University, State College, United Statesen
kaust.grant.numberKUS-I1-003-13en
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