Changes in Carbon Electrode Morphology Affect Microbial Fuel Cell Performance with Shewanella oneidensis MR-1

David V. P. Sanchez, Daniel Jacobs, Kelvin Gregory, Jiyong Huang, Yushi Hu, Radisav Vidic and Minhee Yun
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David V. P. Sanchez: Department of Civil and Environmental Engineering, University of Pittsburgh, 3700 O'Hara St., 742 Benedum Hall, Pittsburgh, PA 15261, USA
Daniel Jacobs: Department of Chemical and Petroleum Engineering, University of Pittsburgh, 3700 O'Hara St., 1249 Benedum Hall, Pittsburgh, PA 15261, USA
Kelvin Gregory: Department of Civil and Environmental Engineering, Carnegie Mellon University, 5000 Forbes Avenue, 119 Porter Hall, Pittsburgh, PA 15213, USA
Jiyong Huang: Department of Electrical and Computer Engineering, University of Pittsburgh, 1140 Benedum Hall, Pittsburgh, PA 15261, USA
Yushi Hu: Department of Electrical and Computer Engineering, University of Pittsburgh, 1140 Benedum Hall, Pittsburgh, PA 15261, USA
Radisav Vidic: Department of Civil and Environmental Engineering, University of Pittsburgh, 3700 O'Hara St., 742 Benedum Hall, Pittsburgh, PA 15261, USA
Minhee Yun: Department of Electrical and Computer Engineering, University of Pittsburgh, 1140 Benedum Hall, Pittsburgh, PA 15261, USA

Energies, 2015, vol. 8, issue 3, 1-13

Abstract: The formation of biofilm-electrodes is crucial for microbial fuel cell current production because optimal performance is often associated with thick biofilms. However, the influence of the electrode structure and morphology on biofilm formation is only beginning to be investigated. This study provides insight on how changing the electrode morphology affects current production of a pure culture of anode-respiring bacteria. Specifically, an analysis of the effects of carbon fiber electrodes with drastically different morphologies on biofilm formation and anode respiration by a pure culture ( Shewanella oneidensis MR-1) were examined. Results showed that carbon nanofiber mats had ~10 fold higher current than plain carbon microfiber paper and that the increase was not due to an increase in electrode surface area, conductivity, or the size of the constituent material. Cyclic voltammograms reveal that electron transfer from the carbon nanofiber mats was biofilm-based suggesting that decreasing the diameter of the constituent carbon material from a few microns to a few hundred nanometers is beneficial for electricity production solely because the electrode surface creates a more relevant mesh for biofilm formation by Shewanella oneidensis MR-1 .

Keywords: Shewanella oneidensis MR-1; microbial fuel cells; biofilm-electrodes; carbon nanofiber; electrode morphology (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2015
References: View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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