Fig. 2.From: Optimization of soil microbial fuel cell for sustainable bio-electricity production: combined effects of electrode material, electrode spacing, and substrate feeding frequency on power generation and microbial community diversity3D plots of the absolute power response to ES and SFI with (a) SEC and (b) CF electrodes. Interactive effect of ES and SFI with (c) SEC, (d) CF electrodes. The green markers represent actual responses below and above the optimal prediction pointBack to article page