Electrochemical system to electrochemically reduce CO into liquid methanol and deliver by-product gaseous H 2, comprising an electrochemical cell with: - an anodic compartment with: • an anode with a current collector, and on the current collector, at least a catalyst to electrochemically oxidize H 2 O to O 2, • an anodic electrolyte solution comprising a solvent, and an anodic supporting electrolyte, the solvent being water at a pH between 10.5 and 13.5; - a cathodic compartment with: • a cathodic electrolyte solution comprising the solvent, and a cathodic supporting electrolyte, the solvent being water at a pH between 10.5 and 13.5; • the reagent CO; • a cathode which comprises, on a current collector which is electrochemically inert, at least a molecular catalyst to electrochemically reduce CO into liquid methanol and to deliver the by-product gas H 2, the molecular catalyst being selected from: - the compounds having the formula: wherein: - R 1 to R 16 are independently selected from the groups consisting of H, F, + N(C 1 -C 4 alkyl) 3 group, or - one or several of the specific following R 1, R 4, R 5, R 8, R 9, R 12, R 13 and R 16 groups being a phenyl group bearing + N(C 1 -C 4 alkyl) 3 substituent in ortho position, the others groups among R 1 to R 16 being H; - Or the compound of formula: - a power supply providing the energy necessary to trigger the electrochemical reactions involving the reagent. - an anodic compartment with: • an anode with a current collector, and on the current collector, at least a catalyst to electrochemically oxidize H 2 O to O 2, • an anodic electrolyte solution comprising a solvent, and an anodic supporting electrolyte, the solvent being water at a pH between 10.5 and 13.5; • an anode with a current collector, and on the current collector, at least a catalyst to electrochemically oxidize H 2 O to O 2, • an anodic electrolyte solution comprising a solvent, and an anodic supporting electrolyte, the solvent being water at a pH between 10.5 and 13.5; - a cathodic compartment with: • a cathodic electrolyte solution comprising the solvent, and a cathodic supporting electrolyte, the solvent being water at a pH between 10.5 and 13.5; • the reagent CO; • a cathode which comprises, on a current collector which is electrochemically inert, at least a molecular catalyst to electrochemically reduce CO into liquid methanol and to deliver the by-product gas H 2, the molecular catalyst being selected from: - the compounds having the formula: wherein: - R 1 to R 16 are independently selected from the groups consisting of H, F, + N(C 1 -C 4 alkyl) 3 group, or - one or several of the specific following R 1, R 4, R 5, R 8, R 9, R 12, R 13 and R 16 groups being a phenyl group bearing + N(C 1 -C 4 alkyl) 3 substituent in ortho position, the others groups among R 1 to R 16 being H; - Or the compound of formula: • a cathodic electrolyte solution comprising the solvent, and a cathodic supporting electrolyte, the solvent being water at a pH between 10.5 and 13.5; • the reagent CO; • a cathode which comprises, on a current collector which is electrochemically inert, at least a molecular catalyst to electrochemically reduce CO into liquid methanol and to deliver the by-product gas H 2, the molecular catalyst being selected from: - the compounds having the formula: wherein: - R 1 to R 16 are independently selected from the groups consisting of H, F, + N(C 1 -C 4 alkyl) 3 group, or - one or several of the specific following R 1, R 4, R 5, R 8, R 9, R 12, R 13 and R 16 groups being a phenyl group bearing + N(C 1 -C 4 alkyl) 3 substituent in ortho position, the others groups among R 1 to R 16 being H; - Or the compound of formula: - the compounds having the formula: wherein: - R 1 to R 16 are independently selected from the groups consisting of H, F, + N(C 1 -C 4 alkyl) 3 group, or - one or several of the specific following R 1, R 4, R 5, R 8, R 9, R 12, R 13 and R 16 groups being a phenyl group bearing + N(C 1 -C 4 alkyl) 3 substituent in ortho position, the others groups among R 1 to R 16 being H; - R 1 to R 16 are independently selected from the groups consisting of H, F, + N(C 1 -C 4 alkyl) 3 group, or - one or several of the specific following R 1, R 4, R 5, R 8, R 9, R 12, R 13 and R 16 groups being a phenyl group bearing + N(C 1 -C 4 alkyl) 3 substituent in ortho position, the others groups among R 1 to R 16 being H; - Or the compound of formula: - a power supply providing the energy necessary to trigger the electrochemical reactions involving the reagent.