激光刻蚀缺陷增强Pt/TiO₂ 光催化还原Co₂ 性能的实验研究

To address the issues of poor light responsiveness and easy recombination of photogeneratcd carriers in titanium dioxide (TiO₂) during photocatalytic reactions, laser etching is employed to modify TiO₂. The study investigates the resulting structural and property changes induced by laser etching, as well as the characteristics of metal-support interactions after Pt loading. The experimental results demonstrate that laser etching leads to an increase in grain size of TiO₂ and the formation of a rutile phase. Additionally, it causes oxygen vacancies (Ov) and TiO₂ defects, leading to a reduced band gap and enhanced visible light response of TiO₂. In comparison to the defects present in the original TiO₂, the defects induced by laser etching exhibit greater stability and stronger reducibility. Consequently, the metal-support interaction in defective Pt/TiO₂ catalysts, prepared using defective TiO₂ as the support, is more pronounced, showcasing superior electron transfer capability and carrier separation performance. These catalysts demonstrate excellent reactivity and selectivity in the photocatalytic reduction of carbon dioxide (Co₂). The findings of this study provide theoretical support for understanding the material characteristics and catalytic applications of laser-etching-induced catalyst supports and catalysts in the field of photocatalysis.