Li Na, Ma Yanlong, Sun Wanjun
School of New Energy and Power Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China.
Molecules. 2024 Aug 23;29(17):3995. doi: 10.3390/molecules29173995.
Artificial photocatalytic energy conversion is a very interesting strategy to solve energy crises and environmental problems by directly collecting solar energy, but low photocatalytic conversion efficiency is a bottleneck that restricts the practical application of photocatalytic reactions. The key issue is that the photo-generated charge separation process spans a huge spatio-temporal scale from femtoseconds to seconds, and involves complex physical processes from microscopic atoms to macroscopic materials. Femtosecond transient absorption (fs-TA) spectroscopy is a powerful tool for studying electron transfer paths in photogenerated carrier dynamics of photocatalysts. By extracting the attenuation characteristics of the spectra, the quenching path and lifetimes of carriers can be simulated on femtosecond and picosecond time scales. This paper introduces the principle of transient absorption, typical dynamic processes and the application of femtosecond transient absorption spectroscopy in photocatalysis, and summarizes the bottlenecks faced by ultrafast spectroscopy in photocatalytic applications, as well as future research directions and solutions. This will provide inspiration for understanding the charge transfer mechanism of photocatalytic processes.
人工光催化能量转换是一种通过直接收集太阳能来解决能源危机和环境问题的非常有趣的策略，但低光催化转换效率是限制光催化反应实际应用的瓶颈。关键问题在于光生电荷分离过程跨越了从飞秒到秒的巨大时空尺度，并且涉及从微观原子到宏观材料的复杂物理过程。飞秒瞬态吸收（fs-TA）光谱是研究光催化剂光生载流子动力学中电子转移路径的有力工具。通过提取光谱的衰减特性，可以在飞秒和皮秒时间尺度上模拟载流子的猝灭路径和寿命。本文介绍了瞬态吸收的原理、典型的动力学过程以及飞秒瞬态吸收光谱在光催化中的应用，并总结了超快光谱在光催化应用中面临的瓶颈以及未来的研究方向和解决方案。这将为理解光催化过程的电荷转移机制提供启发。
