fig9

Figure 9. Activation processes of CO₂ and intermediates (A-D) and the potential energy curves of CO₂ER (E) over N,P/3D-GA (A), Mn/N,P-3D-GA (B), Zn/N,P-3D-GA (C), and MnZn/N,P-3D-GA (D), and MnZn/N,P-3D-GA (D), and Gibbs free energy of CO₂ER (E). CO₂ER: CO₂ electrochemical reduction; 3D: three-dimensional; GA: graphene aerogel.