Figure 4.

CV scans for the a) CP|CNT‐CoPPc cathode, and b) mesoITO|STEMPO anode, recorded separately in a three‐electrode setup, with Pt mesh as the CE and Ag/AgCl as RE. Conditions: CO₂ saturated pH 7.3 aq. HCO₃ ⁻/CO₃ ²⁻ (0.5 m), ν=20 mV s⁻¹, r.t. (pH 8 for cathode N₂ trace). c) Coupled electrolyzer, showing product (liquid and gaseous) and charge passed (red trace, as recorded by the potentiostat, where 1 mol of e⁻=96,485 C or 1 faraday) over reaction time. Conditions: two‐compartment cell fitted with anion‐exchange membrane; three‐electrode configuration with mesoITO|STEMPO as WE, CP|CNT‐CoPPc as CE and Ag/AgCl as RE; CO₂ saturated pH 7.3 aq. HCO₃ ⁻/CO₃ ²⁻ (0.5 m) in both compartments; MBA substrate (30 mm) present in anodic compartment, E _app (anode)=1.0 V vs. NHE, t _CPE=3 h, r.t.; MBAd quantified by HPLC, CO/H₂ by continuous flow GC.