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Schematic of three different solar-driven electrochemical cell configurations for the reduction of CO2. (A) PEC, (B) tandem PEC, and (C) PV-electrolyzer. The light absorber is shown in dark blue, the catalysts as gray particles for PECs and as gray plates for the PV-electrolyzer, and the membrane is represented by a light blue sheet passing through the center of the devices.
