ISM 2022 (Microscopy)


Philip Nathaniel Immanuel Archana Byregowda Lena Yadgarov
Chemical Engineering, Ariel University, Ariel, Israel

Photocatalytic processes are among the prime means for mitigating the pollution caused by toxic effluents, i.e., gases emitted to the air we breathe, liquids that pollute our drinking water, and fields used to grow our crops. In this context, photocatalysis presents a promising path and is thus undergoing rapid evolution. Especially halide perovskites became a promising candidate due to the negative conduction band minimum and the low work function, which is necessary for dye degradation and hydrogen generation. Interestingly, halide perovskite`s performance significantly improves by introducing MoS2 or WS2 as a co-catalyst, which enables suppressed charge recombination and proper band alignment. Here we investigate the photocatalytic performance of Cs4PbBr6/WS2 hybrid nanocomposite’s towards organic dye degradation under visible light illumination. We find that the hybrids of composites Cs4PbBr6/WS2 nanotubes (NT) and Cs4PbBr6/WS2 nanoparticles (NP) significantly increase the degradation rate of methylene blue (MB) compared to pristine Cs4PbBr6 and WS2 nanostructures(NS). Specifically, there is 95% of MB degradation after 90 minutes when we use Cs4PbBr6/WS2 NT and Cs4PbBr6/WS2 NP hybrid composites. Compared with other halide perovskites CsPbBr3 or CsPb2Br5[1] the hybrid WS2 NT/ Cs4PbBr6 and WS2 NP/Cs4PbBr6 exhibits 1.6 times enhanced photocatalytic behavior. The results of optical measurement together with the boosted photocatalytic performance indicated that the hybrid Cs4PbBr6/WS2 composites reduce carrier recombination. These hybrid composites open capable perspectives for the implementation of visible light catalysis.