當前環境問題需要解決的首要問題是綠色能源的採集和從污染物中淨化自然資源。 人類生命威脅的主要原因是有害污水排放帶來的污染。 減少有毒廢水污染的最有效方法之一是光催化反應。 光催化提供了一條潛在的途徑，並在這種情況下迅速發展。 鹵化物鈣鈦礦 (HP) 是極好的候選材料，因為它們的負導帶最小且光催化所需的低功。 令人驚訝的是，通過添加過渡金屬二硫化物作為助催化劑，可以減少電荷複合，HP 的性能會顯著提高。 在這裡，我們研究了 Cs4PbBr6/WS2 奈米複合材料在可見光下降解有機染料的光催化效率。 我們觀察到，與純 Cs4PbBr6 奈米晶體相比，Cs4PbBr6/WS2 奈米結構顯著改善了有機染料的降解。 瞬態吸收的測量揭示了從 Cs4PbBr6 到 WS2 的電荷轉移。 由於載流子復合減少，奈米複合材料表現出改善的光催化性能。
其次，由於其高效率、多功能性和低生產成本，HPs 基太陽能電池引起了廣泛關注。 因此，HPs基太陽能電池具有巨大的商業化潛力。 然而，HP 在正常環境中並不穩定。 因此，HP 的不穩定性是需要解決的重要問題，以使其能夠快速商業化。 WS2 奈米粒子 (NPs) 在這項工作中成功地應用於基於甲基銨碘化鉛 (MAPbI3) 的 HPs 太陽能電池。 穩定劑是 HPs 太陽能電池中 WS2 NPs 的主要功能。 在這裡，WS2 NP 充當電荷轉移通道和散熱器，從而實現有效的電荷分離。 WS2 NPs 有效地從相鄰的 MAPbI3 中提取電子並因此增加了電流密度。 我們的研究結果表明穩定性和太陽能電池性能有了相當大的改善。 結合這兩項工作，WS2 奈米結構增強了光催化降解並提高了 HP 的穩定性。 這為實施 WS2 NPs 以長期穩定 HPs 太陽能電池和淨化資源中的有機污染物鋪平了道路。

The primary problems that need to be resolved concerning the current environmental issues are green energy harvest and the purification of natural resources from pollutants. The main cause of human life threads is pollution brought on by the release of hazardous effluents. One of the most effective methods for reducing toxic effluent pollution is photocatalytic reactions. Photocatalysis offers a potential route and is rapidly evolving in this situation. Halide perovskites (HPs) are excellent candidates because of their negative conduction band minimum and the low work function are necessary for photocatalysis. Surprisingly, by adding transitional-metal dichalcogenides as a co-catalyst, which allows to reduced charge recombination, HPs performance improves dramatically. Here, we examine the photocatalytic efficiency of Cs4PbBr6/WS2 nanocomposites for the degradation of organic dyes under visible light. We observed that the Cs4PbBr6/WS2 nanostructures significantly improve the degradation of organic dye compared to pure Cs4PbBr6 nanocrystals. The measurements of transient absorption reveal a charge transfer from Cs4PbBr6 to WS2. Due to reduced carrier recombination, the nanocomposites exhibit improved photocatalytic performance.
Second, due to their high efficiency, versatility, and low production costs, HPs-based solar cells attracted a lot of attention. Therefore, HPs- based solar cells have enormous commercialization potential. However, HPs are not stable in a normal environment. Thus, the instability of the HPs is an essential issue that needs to be solved to enable its rapid commercialization. The WS2 nanoparticles (NPs) were successfully implemented in this work on HPs-based solar cells that are methylammonium lead iodide (MAPbI3) based. The stabilizing agent is the major function of the WS2 NPs in the HPs-solar cells. Here, the WS2 NPs function as charge transfer pathways and heat dissipators, enabling an efficient charge separation. The WS2 NPs efficiently extract electrons from the adjacent MAPbI3 and increase the current density as a result. Our findings show a considerable improvement in the stability and solar cell properties. Combining these two works, the WS2 nanostructure enhances the photocatalytic degradation as well as improving the stability of the HPs. This pave a for the WS2 nanostructures to be implemented to stabilize HPs solar cells over the long term and to purify the resources from organic pollutants.

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