SnS₂/MWNTs/sponge electrode combined with plasma dielectric barrier discharge catalytic system: CO₂ reduction and...

SnS₂ nanosheets combined with multi-walled carbon nanotubes (MWNTs) were made into sponge electrodes which were used for CO₂ reduction reaction (CO₂RR) in dielectric barrier discharges (DBD) system. The amounts of formate and formaldehyde produced by CO₂ reduction with SnS₂/MWNTs/sponge electrode were 299.52 and 31.62 μmol h^-1, which were higher than that of MWNTs/sponge electrodes. The addition of pollutants had different degrees of inhibitory effect on CO₂ reduction, among which addition of bisphenol A (BPA) had the smallest effect that the degradation rate of BPA was 94.37% and the C1 products remained 204.43 μmol after 60 min discharge. The mechanism of CO₂RR was studied by quencher experiment, and the main contribution order of the active substance in DBD system for CO₂RR is: H⁺>e^->·OH>·O₂^-. It was found that the degradation process of pollutants consumed H⁺ and e^- in solution, thereby inhibiting CO₂RR. Generally, the SnS₂/MWNTs/sponge electrode provided a reference for the design of catalysts for CO₂ reduction and pollutant degradation in plasma gas-liquid system.