Long Period Voltage Oscillations Associated with Reaction Changes between CO₂ Reduction and H₂ Formation in Zero-Gap-Type CO₂ Electrochemical Reactor.

ABSTRACT: Zero-gap-type reactors with gas diffusion electrodes (GDE) that facilitate the CO₂ reduction reaction (CO₂RR) are attractive due to their high current density and low applied voltage. These reactors, however, suffer from salt precipitation and anolyte flooding of the cathode, leading to a short lifetime. Here, using a zero-gap reactor with a transparent cathode end plate, we report periodic voltage oscillations under constant current operation. Increases in cell voltages occur at the same time as the reactor switches from the hydrogen evolution reaction (HER) to predominant CO₂RR; decreases in cell voltage occur with the switch from the CO₂RR to HER. Further, real time visual observations show that salt precipitation occurs during the CO₂

SUBMITTER: Mikami N 

PROVIDER: S-EPMC11406517 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature