Abstract
The performance of a single chamber microbial fuel cell (MFC) with a low-cost polypropylene separator was investigated at various electrode interspaces in a separator electrode assembly (SEA). The lag period was shortened (3.74–0.17 days) and voltage generation was enhanced (0.2–0.5 V) as electrode spacing was increased from 0 to 9 mm. Power density was increased from 220 to 370 mW/m2 with increased spacing. The highest power density of 488 mW/m2 was obtained in polarization analysis with 6 mm. The oxygen mass transfer coefficients with 0 mm (K o = 3.69 × 10−5 cm/s) electrode spacing were 3.8 times higher than with 9 mm (K o = 0.96 × 10−5 cm/s) spacing. Columbic efficiency (CE) was increased from 5 to 32% due to less oxygen diffusion with increase in electrode spacing, but on contrary the ohmic resistance (R oh) was increased from 2 to 4 Ω. In a long-term operation (200 days), a gradual decrease in cathode potentials was observed in all electrode spacing as the main limiting factor of stable MFC performance.
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Acknowledgements
This study was funded by a National Research Foundation of Korea Grant (2015R1D1A1A09059935).
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449_2017_1838_MOESM1_ESM.pptx
Supporting data: Schematic representation of single chamber microbial fuel cell (MFC) with SEA (PPTX 106 kb). Supporting data: Voltage generations noticed in MFC with 1 K Ω as an external resistance, during long-term operation at different electrode distances; 0 mm(A), 3 mm(B), 6 mm(C), 9 mm(D) (PPTX 353 kb)
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Kondaveeti, S., Moon, J.M. & Min, B. Optimum spacing between electrodes in an air-cathode single chamber microbial fuel cell with a low-cost polypropylene separator. Bioprocess Biosyst Eng 40, 1851–1858 (2017). https://doi.org/10.1007/s00449-017-1838-3
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DOI: https://doi.org/10.1007/s00449-017-1838-3