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Effects of applied voltages and dissolved oxygen on sustained power generation by microbial fuel cells.
Water Sci Technol. 2009; 60(5):1311-7.WS

Abstract

Oxygen intrusion into the anode chamber through proton exchange membrane can result in positive redox conditions in fed-batch, two chamber MFCs at the end of a cycle when the substrate is depleted. A slight increase in dissolved oxygen to 0.3 mg/L during MFC operation was not found to adversely affect power generation over subsequent cycles if sufficient substrate (acetate) was provided. Purging the anode chamber with air or pure oxygen for up to 10 days and 10 hrs also did not affect power generation, as power rapidly returned to previous levels when the chamber was sparged with nitrogen gas. When MFCs are connected in series, voltage reversal can occur resulting in a positive voltage applied to the anode biofilm. To investigate if this adversely affected the bacteria, voltages of 1, 2, 3, 4, and 9 V, were applied for 1 hr to the MFC before reconnecting it back to a fixed external load (1,000 Omega). A voltage of <2 V did not affect power generation. However, applying 3 V resulted in a 15 h lag phase before recovery, and 9 V produced a 60 h lag phase suggesting substantial damage to the bacteria that required re-growth of bacteria in the biofilm. These results indicate that charge reversal will be a more serious problem than oxygen intrusion into the anode chamber for sustained performance of MFCs.

Authors+Show Affiliations

Department of Biological Environment, Kangwon National University, 192-1, Hyoja 2-dong, Chuncheon, Kangwon-do 200-701, South Korea. ohsangeun@kangwon.ac.krNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

19717919

Citation

Oh, S E., et al. "Effects of Applied Voltages and Dissolved Oxygen On Sustained Power Generation By Microbial Fuel Cells." Water Science and Technology : a Journal of the International Association On Water Pollution Research, vol. 60, no. 5, 2009, pp. 1311-7.
Oh SE, Kim JR, Joo JH, et al. Effects of applied voltages and dissolved oxygen on sustained power generation by microbial fuel cells. Water Sci Technol. 2009;60(5):1311-7.
Oh, S. E., Kim, J. R., Joo, J. H., & Logan, B. E. (2009). Effects of applied voltages and dissolved oxygen on sustained power generation by microbial fuel cells. Water Science and Technology : a Journal of the International Association On Water Pollution Research, 60(5), 1311-7. https://doi.org/10.2166/wst.2009.444
Oh SE, et al. Effects of Applied Voltages and Dissolved Oxygen On Sustained Power Generation By Microbial Fuel Cells. Water Sci Technol. 2009;60(5):1311-7. PubMed PMID: 19717919.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of applied voltages and dissolved oxygen on sustained power generation by microbial fuel cells. AU - Oh,S E, AU - Kim,J R, AU - Joo,J-H, AU - Logan,B E, PY - 2009/9/1/entrez PY - 2009/9/1/pubmed PY - 2009/10/23/medline SP - 1311 EP - 7 JF - Water science and technology : a journal of the International Association on Water Pollution Research JO - Water Sci Technol VL - 60 IS - 5 N2 - Oxygen intrusion into the anode chamber through proton exchange membrane can result in positive redox conditions in fed-batch, two chamber MFCs at the end of a cycle when the substrate is depleted. A slight increase in dissolved oxygen to 0.3 mg/L during MFC operation was not found to adversely affect power generation over subsequent cycles if sufficient substrate (acetate) was provided. Purging the anode chamber with air or pure oxygen for up to 10 days and 10 hrs also did not affect power generation, as power rapidly returned to previous levels when the chamber was sparged with nitrogen gas. When MFCs are connected in series, voltage reversal can occur resulting in a positive voltage applied to the anode biofilm. To investigate if this adversely affected the bacteria, voltages of 1, 2, 3, 4, and 9 V, were applied for 1 hr to the MFC before reconnecting it back to a fixed external load (1,000 Omega). A voltage of <2 V did not affect power generation. However, applying 3 V resulted in a 15 h lag phase before recovery, and 9 V produced a 60 h lag phase suggesting substantial damage to the bacteria that required re-growth of bacteria in the biofilm. These results indicate that charge reversal will be a more serious problem than oxygen intrusion into the anode chamber for sustained performance of MFCs. SN - 0273-1223 UR - https://www.unboundmedicine.com/medline/citation/19717919/Effects_of_applied_voltages_and_dissolved_oxygen_on_sustained_power_generation_by_microbial_fuel_cells_ L2 - https://iwaponline.com/wst/article-lookup/doi/10.2166/wst.2009.444 DB - PRIME DP - Unbound Medicine ER -