MEDIATING EFFECTS OF FERRIC CHELATE COMPOUNDS IN MICROBIAL FUEL CELLS

MEDIATING EFFECTS OF FERRIC CHELATE COMPOUNDS IN MICROBIAL FUEL CELLS

MEDIATING EFFECTS OF FERRIC CHELATE COMPOUNDS IN MICROBIAL FUEL CELLS

SUMMARY
The performance of b&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. co/i 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. co/i. 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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