Elimination of Power Overshoot at Bioanode through Assistance Current in Microbial Fuel Cells

The power overshoot generated by electron depletion in microbial fuel cells (MFCs) was characterized in this study. Various causes of power overshoot, identified in previous studies, are discussed in terms of their plausible contributions to electron depletion. We found that power overshoot occurred...

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Bibliographic Details
Published in:ChemSusChem 2017-02, Vol.10 (3), p.612-617
Main Authors: Kim, Bongkyu, An, Junyeong, Chang, In Seop
Format: Article
Language:English
Subjects:
Anodes
Anodic
assistance current
bioanode
Biochemical fuel cells
Bioelectric Energy Sources
Cathodes
Control methods
Depletion
Design improvements
Electric Conductivity
Electrodes
electron depletion
Electron Transport
Equipment Design
Fuel cells
Joints
microbial fuel cells
power overshoot
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Summary:The power overshoot generated by electron depletion in microbial fuel cells (MFCs) was characterized in this study. Various causes of power overshoot, identified in previous studies, are discussed in terms of their plausible contributions to electron depletion. We found that power overshoot occurred if the anodic overpotential generated by electron depletion exceeded the cathodic overpotential. The introduction of assistance current from anode connections, which ameliorated the electron depletion in the MFCs, immediately eliminated the power overshoot. As a result, if the electron production at the anode exceeded electron reduction at the cathode, a power overshoot was not generated. The results revealed that introducing assistance current supplied from an additional anode to the limited anode eliminated power overshoot. The power overshoot is not generated by kinetic limitation at the cathode; it is only generated by the kinetic limitation at the anode. The mechanism underlying power overshoot should be considered in the design of MFCs to improve reliability, particularly in scaled‐up plant applications. The proposed technique is more practical than previously proposed methods. A stop to the overshoot: Power overshoot is a crucial issue occurring during discharge tests that are performed to determine the viability of microbial fuel cells. All previously identified causes of power overshoot share the common feature of electron depletion. A method for controlling electron depletion based on assistance current is proposed and eliminates the power overshoot.
ISSN:1864-5631
1864-564X
DOI:10.1002/cssc.201601412