Fig. 3: Acidic CO2RR performance.
From: σ-π dative bond stabilizing copper active site drives CO2 electrocatalysis to hydrocarbon
a Faradaic efficiencies (FEs) of CH4 under different current densities over OMe-PhCu in 0.1 M K2SO4 acidic electrolyte (pH = 3 ± 0.05). b FEs of gaseous products (CH4, H2, CO, C2H4) over OMe-PhCu in 0.2 M K2SO4 acidic electrolyte (pH = 3 ± 0.05). c Partial current densities of CH4 vs. total CO2RR current densities. d FEs of CH4 under different CO2 flow rates and corresponding SPCE of CO2 (pH = 3 ± 0.05). e Comparison of the FE and partial current density of CH4 with those of state-of-the-art catalysts. f Schematic diagram of the proton exchange membrane (PEM) electrolyzer. g Cell voltage of the PEM electrolyzer and corresponding FE of CH4 under various current densities. h Stability test of CO2RR PEM system under 200 mA cm−2. The resistance of the PEM electrolyzer was 4.5 ± 0.1 Ω, the pH of catholyte was 3 ± 0.05, the voltage of the PEM electrolyzer was obtained with 95% iR-correction, and the electrode area is 1 cm2. The error bars represent standard error of the mean and are made based on three fully separate and identical measurements. Source data are provided as a Source Data file.
