A novel TiO₂–CsPbBr₃(Q) photocatalyst is proposed and rationally constructed, where CsPbBr₃ perovskite quantum dots (QDs) of various sizes inside mesopore TiO₂ (M-TiO₂) are integrated. These perovskite QDs, generated in situ within M-TiO₂, establish a type-II homojunction. Interestingly, a Z-scheme heterojunction is simultaneously formed at the interface between CsPbBr₃ and TiO₂. Due to the coexistence of the type-II homojunction and the Z-scheme heterojunction, photogenerated electrons are effectively transferred from TiO₂ to CsPbBr₃, thereby suppressing carrier recombination and thus enhancing the degradation of rhodamine B (RhB). Compared with pure CsPbBr₃ and TiO₂, TiO₂–CsPbBr₃(Q) shows significantly enhanced photocatalytic performance for RhB degradation. The degradation efficiency of RhB in the presence of the TiO₂–CsPbBr₃(Q) attains 97.7% in 5 min under light illumination, representing the highest efficiency observed among photocatalysts based on TiO₂. This study will facilitate the development of superior semiconductor catalysts for photocatalytic applications.

中文翻译：

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通过将 CsPbBr3 量子点同质结与 TiO2 集成的高效同质结/异质结光催化剂用于降解有机染料


提出并合理构建了一种新型TiO ₂ –CsPbBr ₃ (Q)光催化剂，其中介孔TiO内具有不同尺寸的CsPbBr ₃ 钙钛矿量子点（QD） ₂ (M-TiO ₂ ) 被集成。这些钙钛矿量子点在 M-TiO ₂ 内原位生成，建立 II 型同质结。有趣的是，CsPbBr ₃ 和 TiO ₂ 之间的界面同时形成了 Z 型异质结。由于II型同质结和Z型异质结的共存，光生电子有效地从TiO ₂ 转移到CsPbBr ₃ ，从而抑制载流子复合，从而增强降解罗丹明 B (RhB)。与纯CsPbBr ₃ 和TiO ₂ 相比，TiO ₂ -CsPbBr ₃ （Q）对RhB的降解表现出显着增强的光催化性能。在 TiO ₂ –CsPbBr ₃ (Q) 存在下，光照条件下，RhB 的降解效率在 5 分钟内达到 97.7%，这是基于 TiO 的光催化剂中观察到的最高效率 ₂ 。这项研究将有助于开发用于光催化应用的优质半导体催化剂。