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A self-recirculation electrolyte system for unbuffered microbial fuel cells with an aerated cathode
Liang Zhang1, Xun Zhu1, Jun Li1
1Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education, Chongqing 40003, China; Institute of Engineering Thermophysics, Chongqing University, Chongqing 400030, China.
Bioresource Technology
|June 11, 2017
Summary
A novel self-recirculation system enhances microbial fuel cells (MFCs) without buffers. This air-bubble-driven method improves performance by optimizing aeration, though excessive oxygen can harm anode function.
Area of Science:
- Electrochemistry
- Environmental Science
- Biotechnology
Background:
- Microbial fuel cells (MFCs) offer a sustainable energy source.
- Optimizing electrolyte circulation is crucial for MFC performance.
- Unbuffered MFCs present challenges in maintaining optimal conditions.
Purpose of the Study:
- To introduce a self-recirculation electrolyte system for unbuffered MFCs.
- To investigate the effect of air bubble buoyancy on electrolyte recirculation.
- To evaluate the performance of unbuffered MFCs with the proposed system.
Main Methods:
- Designing and implementing a self-recirculation electrolyte system driven by air bubble buoyancy.
- Controlling and varying aeration rates.
- Comparing performance metrics (voltage, power density, Coulombic efficiency, COD removal) under buffered and unbuffered conditions.
Main Results:
- Electrolyte recirculation rate positively correlated with aeration rate within a specific range.
- Unbuffered MFCs showed lower voltage and power density but higher Coulombic efficiency compared to buffered conditions.
- Increasing aeration rate improved voltage, COD removal, and Coulombic efficiency up to an optimal point.
- Excessively high aeration rates negatively impacted anode performance due to oxygen transfer.
Conclusions:
- The self-recirculation system is effective for unbuffered MFCs.
- Aeration rate is a critical parameter influencing MFC performance in unbuffered systems.
- The proposed system shows potential for advancing unbuffered MFC technology.
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