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Gibbs free-energy diagram (in kcal/mol) of electroreduction of the CO2-to-CO pathway on 2 (NiN3S-TPP) under an applied potential of −1.03 V and pH of 7.2 in an aqueous solution. Black line denotes the most favored pathway. Red arrows in the structures represent the unpaired electrons, either on Ni or the porphyrin ligand.
