山东师范大学唐波团队报道了电场驱动载流子，在催化剂颗粒上的重分布以提高光催化性能。相关研究成果于2024年11月11日发表于国际顶尖学术期刊《美国化学会杂志》。

光催化性能主要取决于载体分离效率。应用电场来提高载体分离效率，从而提高催化性能，已成为一种有前景的方法。然而，电场作用下催化剂颗粒上的载体行为仍然很难得到认可。

该文首次利用高时空分辨率的单分子荧光显微镜，观察到电场作用下与电场的方向和强度密切相关的载体，在催化剂颗粒上的再分布行为。

研究进一步获得了载体诱导的光催化氧化还原反应的单分子动力学，结果表明，外部电场在转化过程和解吸过程中起着明显的调节作用，这归因于载体的动态再分配。光催化析氢反应（HER）活性的提高，进一步表明外部电场对光催化的影响。

该项工作为电场对光催化活性的微观调控机制提供了新的见解，并为研究光催化过程中的结构-活性关系提供了新方法。

附：英文原文

Title: Electric-Field-Driven Redistribution of Carriers on Catalyst Particles to Improve Photocatalytic Performance

Author: Yanzheng Chen, Chang Xu, Simin Li, Jinghua An, Lu Li, Bo Tang

Issue&Volume: November 11, 2024

Abstract: The photocatalytic performance is primarily determined by carrier separation efficiency. Applying electric fields to enhance carrier separation efficiency and thereby boost catalytic performance has emerged as a promising approach. However, the carrier behavior on catalyst particles under electric fields was still hardly acknowledged. Herein, using single-molecule fluorescence microscopy with high spatiotemporal resolution, the redistribution behavior of carriers on catalyst particles under an electric field was visualized for the first time, which was closely related to the direction and intensity of the electric field. Single-molecule kinetics of the photocatalytic redox reactions induced by carriers have been further obtained, and the results showed that the external electric field had an obvious regulating role in the conversion process and desorption process in this work, which was attributed to the dynamic redistribution of carriers. The improvement of photocatalytic hydrogen evolution reaction (HER) activity further supports the impact of the external electric field on photocatalysis. This work offers new insight into the microscopic regulation mechanism of photocatalytic activity by electric fields and provides new methods for studying the structure–activity relationship in photocatalytic processes.

DOI: 10.1021/jacs.4c07482

Source: https://pubs.acs.org/doi/abs/10.1021/jacs.4c07482