Electrochemical CO₂ Reduction in the Presence of SO₂ Impurities on a Nitrogen-Doped Carbon Electrocatalyst.

ABSTRACT: Electrochemical CO₂ reduction to CO offers a sustainable route for converting CO₂ into value-added chemicals and fuels. However, CO₂ streams derived from industrial sources often contain SO₂ impurities that severely poison conventional metal-based catalysts. Here, we report a nitrogen-doped carbon catalyst that exhibits pronounced tolerance and stability for CO₂-to-CO conversion in the presence of SO₂ (100-10,000 ppm). The catalyst maintains over 90% Faradaic efficiency toward CO during 8 h of electrolysis at -1.0 V vs RHE with 100 ppm of SO₂, whereas Ag foil electrodes undergo rapid deactivation. Density functional theory calculations combined with surface analyses indicate that weak SO₂ adsorption and

SUBMITTER: Fu S 

PROVIDER: S-EPMC12921853 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature