fig9

Figure 9. (A) Schematic diagram of fabrication of Ni/Cu-N-C; (B and C) FE_CO tests (B) and TOF (C) of Ni/Cu-N-C and other reference catalysts; (D) Current-time response and the corresponding FE_CO of Ni/Cu-N-C at -0.7 V; (A-D) are quoted with permission from Zhu et al.^[171]; (E) Preparation strategy of Zn₁Mn₁-SNC, quoted with permission from Pei et al.^[147]. ZIF: Zeolitic imidazolate framework; RHE: reversible hydrogen electrode; TOF: turnover frequency; FE_CO: Faradaic efficiency for CO.