Fig. 3. Electrochemical release of CO₂ using the NR/NRH2 redox system.

a Schematic of the experimental setup for CO₂ release. The electrochemical H-cell containing NRH2 solution to be oxidized by a constant current at room temperature was connected to a gas flow meter and an FT-IR CO₂ sensor. AEM: anion exchange membrane. b Solution of 4 mL of 50 mM NRH2 was oxidized at a constant current of 50 mA. The amount of released CO₂ (blue curve) and electron utilization (red curve) are shown versus the electric charge.