Chemically regenerative redox fuel cells (CRRFCs) using liquid catalysts as an alternative to solid-state cathode catalysts have been intensively studied. Here, we studied Fe<sup>2+sup>/Fe<sup>3+sup> as a liquid catalyst with Fe-macrocycles as a cocatalyst in CRRFCs. The Fe<sup>2+sup>-oxidation rate was enhanced in the presence of Fe-Phthanolocyanine. The single cell having the cathode supplied by the liquid catalyst with Fe-Pc showed a maximum power density of ∼249 mW cm<sup>–2sup>.