PMID: 16646485May 2, 2006Paper

Increased power generation in a continuous flow MFC with advective flow through the porous anode and reduced electrode spacing

Environmental Science & Technology
Shaoan ChengBruce E Logan

Abstract

The maximum power generated in a single-chamber air-cathode microbial fuel cell (MFC) has previously been shown to increase when the spacing between the electrodes is decreased from 4 to 2 cm. However, the maximum power from a MFC with glucose (500 mg/L) decreased from 811 mW/ m2 (R(ex) = 200 omega, Coulombic efficiency of CE = 28%) to 423 mW/m2 (R(ex) = 500 omega, CE = 18%) when the electrode spacing was decreased from 2 to 1 cm (batch mode operation, power normalized by cathode projected area). This decrease in power was unexpected as the internal resistance decreased from 35 omega (2-cm spacing) to 16 omega (1-cm spacing). However, providing advective flow through the porous anode toward the cathode substantially increased power, resulting in the highest maximum power densities yet achieved in an air-cathode system using glucose or domestic wastewater as substrates. For glucose, with a 1-cm electrode spacing and flow through the anode with continuous flow operation of the MFC, the maximum power increased to 1540 mW/m2 (51 W/m3) and the CE increased to 60%. Using domestic wastewater (255 +/- 10 mg of COD/L), the maximum power density was 464 mW/m2 (15.5 W/m3; CE = 27%). Although flow through the anode could lead to plugging, ...Continue Reading

References

Jun 8, 2004·Environmental Science & Technology·Bruce E Logan
Aug 28, 2004·Trends in Biotechnology·Largus T AngenentRosa Domíguez-Espinosa
Sep 4, 2004·Applied and Environmental Microbiology·Korneel RabaeyWilly Verstraete
Jun 1, 2005·Trends in Biotechnology·Korneel Rabaey, Willy Verstraete

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Citations

Jun 27, 2007·Applied Microbiology and Biotechnology·Byung Hong KimGeoffrey M Gadd
Sep 6, 2007·Applied Microbiology and Biotechnology·Sokhee Jung, John M Regan
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