Boosting CO₂ Conversion by Synergy of Lead-Free Perovskite Cs₂SnCl₆ and Plasma with H₂O

Abstract

Although dielectric barrier discharge (DBD) plasma is a promising technique for CO 2 conversion, realizing CO 2 -to-alcohol is still challenging via the use of H 2 O. Herein, for the first time, efficient CO 2 conversion was achieved via the synergism between the Cs 2 SnCl 6 photocatalyst and DBD plasma assisted by H 2 O. The CO 2 conversion ratio of plasma photocatalysis was 6.5% higher than that of only the plasma and photocatalysis, implying that the synergism of plasma catalysis and photocatalysis was achieved. Furthermore, the DBD plasma assisted by the Cs 2 SnCl 6 photocatalyst could convert CO 2 and H 2 O to CO and a small amount of methanol and ethanol. The CO 2 conversion ratio was enhanced by 50.6% in the presence of H 2 O, which was attributed to the improvement of charge transfer due to the increased electrical conductivity of the photocatalyst surface during plasma discharge. This work provides a new idea for developing an efficient system for CO 2 utilization.