Size Expansion in Air-Cathode Microbial Fuel Cells for CO₂ Capture

The most widely adopted method for carbon dioxide (CO2) capture is chemical absorption using alkaline solutions. In our ongoing research, we have investigated the use of microbial fuel cells (MFCs) to generate alkaline solutions for CO2 capture and to convert atmospheric CO2 into a stable carbonate compound through contact with the alkaline solutions. In this report, we describe the operation of an MFC system featuring an enlarged cathode area and increased volume compared to our previous design. The modified MFC successfully maintained an average power output of approximately 3.5 mA over a continuous operation period exceeding 1500 hours. Furthermore, CO2 capture was achieved during this operational period.