Journal
CHEMSUSCHEM
Volume 10, Issue 3, Pages 612-617Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201601412
Keywords
assistance current; bioanode; electron depletion; microbial fuel cells; power overshoot
Funding
- Nation Research Foundation of Korea (NRF) grant - Korea government (MSIP) [2016R1A2B3015426]
- National Research Foundation of Korea [2016R1A2B3015426] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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