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Calculated free-energy diagrams for CO2RR on Cu(111) and Fe3O6H6/Cu(111) under zero (A) and applied electrode potentials (B). The values in B (i.e., 0.85 and 0.51 eV) show the potential-determining energy barriers that should be overcome for the CH4 production on Cu(111) and Fe3O6H6/Cu(111). Cu, blue; Fe, orange; O, red; C, brown; and H, white.
