Huang Xing, Lv Kuanxin, Zhu Wenqiang, Li Zhenzhen, Zhao Hang
College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, China.
Molecules. 2024 Jul 9;29(14):3249. doi: 10.3390/molecules29143249.
Efficient, low-cost photocatalysts with mild synthesis conditions and stable photocatalytic behavior have always been the focus in the field of photocatalysis. This study proves that non-quantum-dot CsPbICl-based materials, created by a simple method, can be successfully employed as new high-efficient photocatalysts. The results demonstrate that two-dimensional CsPbICl perovskite can achieve over three times higher photocatalytic performance compared to three-dimensional CsPbBr perovskite. Moreover, the photocatalytic performance of CsPbICl can be further improved by constructing a heterojunction structure, such as CsPbICl/CsPbBr. CsPbICl can connect well with CsPbBr through a simple method, resulting in tight bonding at the interface and efficient carrier transfer. CsPbICl/CsPbBr exhibits notable 5-fold and 10-fold improvements in photocatalytic performance and rate compared to CsPbBr. Additionally, CsPbICl/CsPbBr demonstrates superb stable catalytic performance, with nearly no decrease in photocatalytic performance after 7 months (RH = 20% ± 10, T = 25 °C ± 5). This study also reveals that the photocatalytic process based on CsPbICl/CsPbBr can directly oxidize organic matter using holes, without relying on the generation of intermediate reactive oxygen species from water or oxygen (such as ·OH or ·O), showcasing further potential for achieving high photocatalytic efficiency and selectivity in anhydrous/anaerobic catalytic reactions and treating recalcitrant pollutants.
具有温和合成条件和稳定光催化行为的高效、低成本光催化剂一直是光催化领域的研究重点。本研究证明，通过一种简单方法制备的非量子点CsPbICl基材料可成功用作新型高效光催化剂。结果表明，二维CsPbICl钙钛矿的光催化性能比三维CsPbBr钙钛矿高出三倍以上。此外，通过构建异质结结构，如CsPbICl/CsPbBr，可以进一步提高CsPbICl的光催化性能。CsPbICl可以通过一种简单方法与CsPbBr良好连接，在界面处形成紧密结合并实现高效载流子转移。与CsPbBr相比，CsPbICl/CsPbBr的光催化性能和速率显著提高了5倍和10倍。此外，CsPbICl/CsPbBr表现出卓越的稳定催化性能，在7个月后（相对湿度=20%±10，温度=25℃±5）光催化性能几乎没有下降。本研究还表明，基于CsPbICl/CsPbBr的光催化过程可以直接利用空穴氧化有机物，而不依赖于水或氧气产生的中间活性氧物种（如·OH或·O），这在无水/厌氧催化反应和处理难降解污染物方面展现了实现高光催化效率和选择性的进一步潜力。
