Figure 4.

(A) CO partial current density and CO₂ conversion with a one-cell electrolyzer and an electrolyzer stack consisting of three cells, in the parallel configuration during electrolysis at different cell voltages with 433 cm³ min^–1 CO₂ feed rate per cell at the cathode. (B) CO₂ conversion with a single-cell electrolyzer and an electrolyzer stack consisting of three cells, in the serial configuration, at different CO₂ feed rates, at ΔU = −2.75 V/cell.