fig4
Figure 4. (A) Discharge capacity and Coulombic efficiency (CE) and (B) EE of the Fe-S RFB cells in the presence and absence of 30.0 mM FMN-Na catalyst at 40 mA cm-2. The cell composition was 20.0 mL 2.0 M K2S + 1.0 M KCl, with or without FMN-Na | PFSA | 25.0 mL 0.1 M K4[Fe(CN)6] + 2.0 M KCl. FMN-Na: Flavin mononucleotide sodium salt; EE: energy efficiency; PFSA: perfluorosulfonic acid membrane.
