The effect of internal capacitance on power quality and energy efficiency in a tubular microbial fuel cell |
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| Affiliation: | 1. Sustainable Environment Research Centre (SERC), Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd, Mid-Glamorgan CF37 1DL, UK;2. School of Chemical and Biomolecular Engineering, Pusan National University (PNU), Busandaehak-ro, 63 Beon-gil, Geumjeong-gu, Busan 609-735, South Korea;1. McGill University, Bioresource Engineering Department, 21111 Lakeshore Rd., Ste-Anne-de-Bellevue, QC H9X 3V9, Canada;2. National Research Council of Canada, 6100 Royalmount Ave, Montreal, QC H4P 2R2, Canada;1. Departement de Génie Chimique, École Polytechnique Montréal, C.P. 6079 Succ., Centre-Ville Montréal, QC, Canada;2. National Research Council of Canada, 6100 Royalmount Ave., Montreal, QC, Canada;1. Departement de Génie Chimique, École Polytechnique Montréal, C.P.6079 Succ., Centre-Ville Montréal, QC H3C 3A7, Canada;2. National Research Council of Canada, 6100 Royalmount Ave., Montréal, QC H4P 2R2, Canada;1. The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA 99163, USA;2. School of Electrical Engineering and Computer Science, Washington State University, Pullman, WA 99163, USA |
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| Abstract: | The pseudo-capacitive behaviour of a high surface area carbon veil electrode in a tubular microbial fuel cell (MFC) was investigated as a mechanism to enhance power quality and energy efficiency. Accumulated charge and energy from the anodic biofilm after prolonged open circuit times (1–120 min) were compared against equivalent periods of steady state loading (R = 100–3000 Ω). A significant difference in the amount of accumulated charge with different loads was observed, resulting in 1.051 C (R = 100 Ω) compared to 0.006 C (R = 3 kΩ). The automated application of short open and closed circuit (0.5–10 s) cycles resulted in an increase of power/current production (closed circuit alone), but presented lower efficiency considering entire open and closed period. The cumulative charge on the carbon veil electrode with biofilm was 39,807 C m−2 at 100 Ω. Electrochemical Impedance Spectroscopy (EIS) showed that the Helmholtz layer presented a double layer capacitance of more than ten times the biofilm on electrode. The results indicate that the capacitive behaviour could be utilized to increase the power quality, i.e. its availability/applicability with respect to the operation of low power consuming devices. |
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| Keywords: | Microbial fuel cell (MFC) Power quality Double layer capacitance Biofilm capacitance Charge accumulation |
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