Photocatalytic processes are among the prime means for mitigating the pollution caused by toxic effluents. In this context, photocatalysis presents a promising path and is undergoing rapid evolution. Halide perovskite-nanocrystals (HP-NCs) are excellent candidates due to their negative conduction band minimum and low work function, essential for photocatalysis. Yet, HP-NCs face limitations within this domain because they are prone to chemical degradation when exposed to external factors like high temperature, polar solvents, oxygen, and light. A practical approach toward stabilizing HP-NCs involves hybridizing them with a chemically inert material that can provide steric stabilization and act as a cocatalyst. Transition-metal dichalcogenides emerge as outstanding candidates to sterically stabilize the HPs as they are stable, chemically inert, and can serve as co-catalysts, enabling suppressed charge recombination. Herein, the photocatalytic performance of Cs₄PbBr₆/WS₂-nanocomposites towards organic dye degradation in polar solvents under visible light illumination is investigated. We found that the presence of WS₂ nanostructures significantly stabilizes the HP-NCs and promotes dye degradation rate compared to pristine Cs₄PbBr₆-NCs. Using transient absorption measurements, we found that the WS₂-nanostructures act as an electron transport channel, effectively reducing charge recombination in the NCs. These findings pave the way for implementing Cs₄PbBr₆/WS₂-nanocomposites as stable and superior photocatalysts.

中文翻译：

---

Cs4PbBr6/WS2 杂化纳米复合材料增强光催化活性

光催化过程是减轻有毒废水造成的污染的主要手段之一。在这种背景下，光催化提供了一条充满希望的道路，并且正在快速发展。卤化物钙钛矿纳米晶体（HP-NC）因其负导带最小值和低逸出功而成为极佳的候选者，这对于光催化至关重要。然而，HP-NC 在这一领域面临着局限性，因为它们在暴露于高温、极性溶剂、氧气和光线等外部因素时容易发生化学降解。稳定 HP-NC 的一种实用方法是将它们与化学惰性材料混合，该材料可以提供空间稳定性并充当助催化剂。过渡金属二硫属化物成为空间稳定 HP 的杰出候选者，因为它们稳定、化学惰性，并且可以作为助催化剂，从而抑制电荷复合。在此，研究了Cs ₄ PbBr ₆ /WS ₂ -纳米复合材料在可见光照射下对极性溶剂中有机染料降解的光催化性能。我们发现，与原始 Cs ₄ PbBr _{6 -NC 相比，WS 2}纳米结构的存在显着稳定了 HP-NC，并提高了染料降解率。通过瞬态吸收测量，我们发现WS ₂纳米结构充当电子传输通道，有效减少NC中的电荷复合。这些发现为将Cs ₄ PbBr ₆ /WS ₂纳米复合材料用作稳定且优异的光催化剂铺平了道路。