Fig. 4: Photocurrent generation and electrochemical properties of PEDOT-S/S. elongatus biocomposites. | Nature Communications

Fig. 4: Photocurrent generation and electrochemical properties of PEDOT-S/S. elongatus biocomposites.

From: Three-dimensional conductive conjugated polyelectrolyte gels facilitate interfacial electron transfer for improved biophotovoltaic performance

Fig. 4

a, b Chronoamperometry (CA) plots for S. elongatus and PEDOT-S/S. elongatus biocomposites under alternating light and dark conditions without and with the presence of 1 mM K3[Fe(CN)6]. The solid line shows the average current density while the shaded area represents the standard error of the mean (n = 3, biologically independent samples). The photocurrent density (Jph) is defined as the difference in current between the light-on and light-off states. c Comparison of Jph for S. elongatus alone and PEDOT-S/S. elongatus biocomposites under mediator-less conditions. The p-value for the comparison between bare cells and 5 mg mL−1 PEDOT-S/S. elongatus biocomposites is 0.009 (*p < 0.05, **p < 0.01). d Representative Nyquist plots for S. elongatus and PEDOT-S/S. elongatus biocomposites under mediator-less conditions. e Electroactive surface areas (ESAs) of bare ITO and PEDOT-S at various concentrations determined by CV analysis. The p value for the comparison between bare cells and 2 mg mL−1 PEDOT-S/S. elongatus biocomposites is 0.005 (*p < 0.05, **p < 0.01). f Comparison of Jph for S. elongatus and PEDOT-S/S. elongatus biocomposites under mediator conditions. The DCMU control experiments were performed on the 2 mg mL−1 PEDOT-S biocomposite samples. The p-value for the comparison between bare cells and 5 mg mL−1 PEDOT-S/S. elongatus biocomposites is 0.006 (*p < 0.05, **p < 0.01). g Representative Nyquist plots for S. elongatus and PEDOT-S/S. elongatus biocomposites under mediator conditions. The average charge transfer resistance (RCT) values annotated were determined from equivalent circuit fitting. h Current density (J) over time from CA measurements for S. elongatus and PEDOT-S/S. elongatus biocomposites under continuous illumination over 12 hours. The data are shown as a percentage of the initial current output (J %). In all figures the error bars represent the standard error of the mean (n = 3, except 2 mg mL−1 in (c) n = 4, all are biologically independent samples). Statistical analysis was performed using one-way ANOVA followed by Tukey’s Honestly Significant Difference (HSD) post-hoc test. All tests were two-sided, and p values were adjusted for multiple comparisons.

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