Evaluation of multi-brush anode systems in microbial fuel cells.
The packing density of anodes in microbial fuel cells (MFCs) was examined here using four different graphite fiber brush anode configurations. The impact of anodes on performance was studied in terms of carbon fiber length (brush diameter), the number of brushes connected in parallel, and the wire current collector gage. MFCs with different numbers of brushes (one, three or six) set perpendicular to the cathode all produced similar power densities (1200 ± 40 mW/m(2)) and coulombic efficiencies (60% ± 5%). Reducing the number of brushes by either disconnecting or removing them reduced power, demonstrating the importance of anode projected area covering the cathode, and therefore the need to match electrode projected areas to maintain high performance. Multi-brush reactors had the same COD removal as single-brush systems (>90%). The use of smaller Ti wire gages did not affect power generation, which will enable the use of less metal, reducing material costs.
Department of Civil and Environmental Engineering, Penn State University, 212 Sackett Building, University Park, PA 16802, USA.
Vanessa
V
Lanas
Bruce E
BE
Logan
D001674:Bioelectric Energy Sources; D057919:Biological Oxygen Demand Analysis; D058266:Dielectric Spectroscopy; D017097:Electric Impedance; D004566:Electrodes; D010100:Oxygen / Q000032:analysis
D010100:Oxygen
Carbon brush anode; Current collector; Diameter; Microbial fuel cell