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Occurrence and implications of voltage reversal in stacked microbial fuel cells.
ChemSusChem. 2014 Jun; 7(6):1689-95.C

Abstract

Voltage reversal in stacked microbial fuel cells (MFCs) is a significant challenge that must be addressed, and the information on its definite cause and occurrence process is still obscure. In this work, we first demonstrated that different anodic reaction rates caused voltage reversal in a stacked MFC. Sluggish reaction rates on the anode in unit 1 of the stacked MFC resulted in a significantly increased anode overpotential of up to 0.132 V, as compared to negligible anode overpotential (0.0247 V) in unit 2. This work clearly verified the process of voltage reversal in the stacked MFC. As the current was gradually increased in the stacked MFC, the voltage in the stacked unit 1 decreased to 0 V prior to that of the stacked unit 2. Then, when the voltage in unit 1 became 0 V, it was converted from a galvanic cell to an electrochemical cell powered by unit 2. We found that the stacked unit 2 provided electrical energy for the stacked unit 1 as a power supply. Finally, the anode potential of the stacked unit 1 significantly increased over cathode potential as current increased further, which caused voltage reversal in unit 1. Voltage reversal occurs in stacked MFCs as a result of non-spontaneous anode overpotential in a unit MFC that has sluggish anode kinetics compared to the other unit MFCs.

Authors+Show Affiliations

Department of Environmental and Civil Engineering, University of Waterloo, 200 University Avenue West Waterloo, Ontario, N2 L 3G1 (Canada). anjy0924@gmail.com.No affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

24771553

Citation

An, Junyeong, and Hyung-Sool Lee. "Occurrence and Implications of Voltage Reversal in Stacked Microbial Fuel Cells." ChemSusChem, vol. 7, no. 6, 2014, pp. 1689-95.
An J, Lee HS. Occurrence and implications of voltage reversal in stacked microbial fuel cells. ChemSusChem. 2014;7(6):1689-95.
An, J., & Lee, H. S. (2014). Occurrence and implications of voltage reversal in stacked microbial fuel cells. ChemSusChem, 7(6), 1689-95. https://doi.org/10.1002/cssc.201300949
An J, Lee HS. Occurrence and Implications of Voltage Reversal in Stacked Microbial Fuel Cells. ChemSusChem. 2014;7(6):1689-95. PubMed PMID: 24771553.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Occurrence and implications of voltage reversal in stacked microbial fuel cells. AU - An,Junyeong, AU - Lee,Hyung-Sool, Y1 - 2014/04/25/ PY - 2013/09/05/received PY - 2013/11/25/revised PY - 2014/4/29/entrez PY - 2014/4/29/pubmed PY - 2015/2/5/medline KW - anode overpotential KW - biocatalyst KW - kinetics KW - stacked microbial fuel cells KW - voltage reversal SP - 1689 EP - 95 JF - ChemSusChem JO - ChemSusChem VL - 7 IS - 6 N2 - Voltage reversal in stacked microbial fuel cells (MFCs) is a significant challenge that must be addressed, and the information on its definite cause and occurrence process is still obscure. In this work, we first demonstrated that different anodic reaction rates caused voltage reversal in a stacked MFC. Sluggish reaction rates on the anode in unit 1 of the stacked MFC resulted in a significantly increased anode overpotential of up to 0.132 V, as compared to negligible anode overpotential (0.0247 V) in unit 2. This work clearly verified the process of voltage reversal in the stacked MFC. As the current was gradually increased in the stacked MFC, the voltage in the stacked unit 1 decreased to 0 V prior to that of the stacked unit 2. Then, when the voltage in unit 1 became 0 V, it was converted from a galvanic cell to an electrochemical cell powered by unit 2. We found that the stacked unit 2 provided electrical energy for the stacked unit 1 as a power supply. Finally, the anode potential of the stacked unit 1 significantly increased over cathode potential as current increased further, which caused voltage reversal in unit 1. Voltage reversal occurs in stacked MFCs as a result of non-spontaneous anode overpotential in a unit MFC that has sluggish anode kinetics compared to the other unit MFCs. SN - 1864-564X UR - https://www.unboundmedicine.com/medline/citation/24771553/Occurrence_and_implications_of_voltage_reversal_in_stacked_microbial_fuel_cells_ L2 - https://doi.org/10.1002/cssc.201300949 DB - PRIME DP - Unbound Medicine ER -
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