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Graphite fiber brush anodes for increased power production in air-cathode microbial fuel cells.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Logan, Bruce E. Cheng, Shaoan Watson, Valerie J. Estadt, Garett |
| Copyright Year | 2007 |
| Abstract | To efficiently generate electricity using bacteria in microbial fuel cells (MFCs), highly conductive noncorrosive materials are needed that have a high specific surface area (surface area per volume) and an open structure to avoid biofouling. Graphite brush anodes, consisting of graphite fibers wound around a conductive, but noncorrosive metal core, were examined for power production in cube (C-MFC) and bottle (B-MFC) air-cathode MFCs. Power production in C-MFCs containing brush electrodes at 9600 m2/m3 reactor volume reached a maximum power density of 2400 mW/m2 (normalized to the cathode projected surface area), or 73 W/m3 based on liquid volume, with a maximum Coulombic efficiency (CE) of 60%. This power density, normalized by cathode projected area, is the highest value yet achieved by an air-cathode system. The increased power resulted from a reduction in internal resistance from 31 to 8 Q. Brush electrodes (4200 m2/m3) were also tested in B-MFCs, consisting of a laboratory media bottle modified to have a single side arm with a cathode clamped to its end. B-MFCs inoculated with wastewater produced up to 1430 mW/m2 (2.3 W/m3, CE = 23%) with brush electrodes, versus 600 mW/m2 with a plain carbon paper electrode. These findings show that brush anodes that have high surface areas and a porous structure can produce high power densities, and therefore have qualities that make them ideal for scaling up MFC systems. |
| File Format | PDF HTM / HTML |
| DOI | 10.1021/es062644y |
| PubMed reference number | 17539547 |
| Journal | Medline |
| Volume Number | 41 |
| Issue Number | 9 |
| Alternate Webpage(s) | http://web.mit.edu/pweigele/www/Storage/Readings_files/Brush%20fiber%20anodes%20in%20MFCs.pdf |
| Alternate Webpage(s) | https://doi.org/10.1021/es062644y |
| Journal | Environmental science & technology |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
