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Published on: July 24, 2018
Suspended anode-type microbial fuel cells for enhanced electricity generation.
Yiyang Liu1, Xiaoyan Sun2, Di Yin1
1State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology Shanghai 200237 China lezhanghua@163.com +86 21 6425 3321 +86 21 6425 3321.
This study introduces a suspended anode microbial fuel cell using carbon granules, enhancing power generation by increasing anode surface area and improving substrate diffusion. Optimized mixing and granule content significantly boosted power density while reducing internal resistance.
Area of Science:
- Electrochemistry
- Environmental biotechnology
- Microbial fuel cells
Background:
- Microbial fuel cells (MFCs) face limitations in electricity generation due to anode area, substrate diffusion, and internal resistance.
- Developing novel anode designs is crucial for improving MFC performance and efficiency.
Purpose of the Study:
- To develop and evaluate a suspended anode (carbon-based felt granule) MFC to overcome traditional limitations.
- To investigate the impact of anode volume utilization, surface area, and mixing on power generation.
Main Methods:
- A suspended anode MFC utilizing carbon-based felt granules was designed and constructed.
- A rotating current collector was implemented for intermittent contact and enhanced mixing within the anode chamber.
- Experiments were conducted to assess power density, open-circuit voltage, and internal resistance under varying conditions (mixing rate, granule content, rotational speed).
Main Results:
- The MFC achieved a stable open-circuit voltage of approximately 0.83 V.
- Maximum power density increased with higher mixing rates, reaching 951 ± 14 mW m-3 at 50 g carbon granules and 300 rpm.
- Internal resistance decreased with increased rotational speed and carbon granule content, reaching a minimum of 162.9 ± 3.5 Ω.
Conclusions:
- The suspended anode MFC design effectively enhances power generation by maximizing anode surface area and improving substrate diffusion.
- Optimizing carbon granule content and mixing is key to maximizing power density and minimizing internal resistance in MFCs.
- Higher carbon granule content, however, correlated with reduced coulombic efficiency and exoelectrogenic bacteria abundance.
