College of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China.
Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), College of Optoelectronic Engineering, Chongqing University, Chongqing, 400044, China.
Small. 2023 Jul;19(27):e2207915. doi: 10.1002/smll.202207915. Epub 2023 Mar 28.
Lead halide perovskite materials have great potential for photocatalytic reaction due to their low fabrication cost, unique optical absorption coefficient, and suitable band structures. However, the main problems are the toxicity and instability of the lead halide perovskite materials. Therefore, a facile synthetic method is used to prepare lead-free environmentally friendly Cs TiX (X = Cl, Cl Br , Br) perovskite materials. Their structural and optical characteristics are systematically investigated. The band gaps of the produced samples are illustrated to be from 1.87 to 2.73 eV. Moreover, these materials can keep high stability in harsh environments such as illumination and heating, and the Cs Ti(Cl Br ) microcrystals demonstrate the yields of 176 µmol g for CO and 78.9 µmol g for CH after light irradiation for 3 h, which is of the first report of Ti-based perovskite photocatalysts. This finding demonstrates that the Ti-based perovskites will create opportunities for photocatalytic applications, which may offer a new idea to construct low-cost, eco-friendly, and bio-friendly photocatalysts.
卤铅钙钛矿材料由于其低廉的制造成本、独特的光学吸收系数和合适的能带结构，在光催化反应中具有巨大的潜力。然而，主要问题是卤铅钙钛矿材料的毒性和不稳定性。因此，采用简便的合成方法制备了无铅环保的 Cs TiX（X = Cl、Cl Br、Br）钙钛矿材料。系统研究了它们的结构和光学特性。所制备样品的带隙为 1.87 至 2.73 eV。此外，这些材料在光照和加热等恶劣环境下仍能保持高稳定性，Cs Ti（Cl Br ）微晶体在光照 3 小时后对 CO 的产率为 176 µmol g，对 CH 的产率为 78.9 µmol g，这是首例关于基于 Ti 的钙钛矿光催化剂的报道。这一发现表明，基于 Ti 的钙钛矿将为光催化应用创造机会，这可能为构建低成本、环保和生物友好型光催化剂提供新的思路。
