Fig. 5: Theoretical calculations.

a Calculated Gibbs free energy diagrams, where * stands for the protonated CoPc (H-CoPc). b Proposed reaction steps for the conversion of CO2 to CO, CO to CH3OH on CoPc/MWCNT.
a Calculated Gibbs free energy diagrams, where * stands for the protonated CoPc (H-CoPc). b Proposed reaction steps for the conversion of CO2 to CO, CO to CH3OH on CoPc/MWCNT.