Fig. 4: Performance comparison of the MFFCs with or without redox mediators.
From: High power density redox-mediated Shewanella microbial flow fuel cells
a OCVs of the MFFCs with different redox mediators (2-AQS: ~0.1 mM, 2,7-AQDS: ~25 mM, and FMN-Na: ~25 mM). b Instant power polarization curves of the MFFCs with different redox mediators at the scan rate of 0.5 mA cm−2 s−1. c Polarization curves and power output of the redox-mediated MFFCs measured with external resistors. d Comparison of power densities of the MFFCs with or without redox mediators. The error bars represent the standard deviations from 3 repeating tests. e Comparison of power density and current density with the state-of-art MFCs with different electrode materials and redox mediators, respectively. f Long duration operation of the redox-mediated MFFCs under a constant current.
