fig1

Figure 1. (A) Cyclic voltammograms of K₂S in KCl electrolyte at different scan rates; (B) Schematic representation of the redox reaction of FMN-Na; (C) Cyclic voltammograms of FMN-Na in KCl electrolyte at scan rates ranging from 10 to 50 mV s^-1; (D) Cyclic voltammograms of FMN-Na in alkaline electrolyte at different concentrations, recorded at 10 mV s^-1; (E) Cyclic voltammograms of 30.0 mM FMN-Na in alkaline electrolyte at varying scan rates; (F) Comparison of cyclic voltammograms for K₂S in KCl electrolyte and FMN-Na in alkaline electrolyte, both recorded at 10 mV s^-1; (G) Plots of redox peak currents against the square root of scan rate for the S₂^2-/S^2- redox pair and the FMN^3-/FMN^5- couple. FMN-Na: Flavin mononucleotide sodium salt; SCE: saturated calomel electrode.