Low energy carbon capture via electrochemically induced pH swing with electrochemical rebalancing.

ABSTRACT: We demonstrate a carbon capture system based on pH swing cycles driven through proton-coupled electron transfer of sodium (3,3'-(phenazine-2,3-diylbis(oxy))bis(propane-1-sulfonate)) (DSPZ) molecules. Electrochemical reduction of DSPZ causes an increase of hydroxide concentration, which absorbs CO₂; subsequent electrochemical oxidation of the reduced DSPZ consumes the hydroxide, causing CO₂ outgassing. The measured electrical work of separating CO₂ from a binary mixture with N₂, at CO₂ inlet partial pressures ranging from 0.1 to 0.5 bar, and releasing to a pure CO₂ exit stream at 1.0 bar, was measured for electrical current densities of 20-150 mA cm^-2. The work for separating CO₂ from a 0.1 bar inlet and

SUBMITTER: Jin S 

PROVIDER: S-EPMC9018824 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature