Abstract
The performance of bio-fuel cells containing Escherichia coli , glucose and a series of ferric chelate reagents was studied. The measured coulombic outputs indicate that most of the compounds work effectively as electron-transfer mediators in the fuel cells. These outputs were compared with measured rate constants for the reduction of ferric chelates by E. coli and the electrochemical reaction of these compounds at a carbon electrode. The results suggest that a good mediator for microbial fuel cells is one which shows fast reduction by E. coli , together with a fast electrode reaction. In regenerative fuel cells which were run for five days, coulombic yields over 70% were obtained on the basis of complete oxidation of added glucose.
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