Huang Yunyun, Mou Caini, Liang Jiaxuan, Wan Jiaxin, Chen Pengwei, Guan Bai-Ou
Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou, 511443, China.
College of Physics & Optoelectronic Engineering, Jinan University, Guangzhou, 510632, China.
Adv Sci (Weinh). 2024 Jul;11(26):e2310264. doi: 10.1002/advs.202310264. Epub 2024 Apr 30.
Operando decoding of the key parameters of photo-electric catalysis provides reliable information for catalytic effect evaluation and catalytic mechanism exploration. However, to capture the details of surface-localized and rapid chemical and thermal events at the nanoscale in real-time is highly challenging. A promising approach based on a lab-around-microfiber sensor capable of simulating photo-electric catalytic reactions on the surface of optical fibers as well as monitoring reactant concentration changes and catalytic heat generation processes is demonstrated. Due to the penetration depth of submicron size and the fast response ability of the evanescent field, the lab-around-microfiber sensor overcame the difficulty of reading instantaneous surface parameters in the submicron range. This sensor operando dismantled the changes in reactant concentration and temperature on the catalyst surface induced by light and voltage, respectively. It also decoded the impact of catalyst composition on the adsorption efficiency and catalytic efficiency across various wavelengths and determined the synchronized occurrence of pollutant degradation and catalytic thermal effects. Stable correlations between the real-time parameters and catalytic activities are obtained, helping to provide a basic understanding of the catalytic process and mechanism. This approach fills an important gap in the current monitoring methods of catalytic processes and heat production.
光电催化关键参数的原位解码为催化效果评估和催化机理探索提供了可靠信息。然而，要实时捕捉纳米尺度下表面局部快速化学和热事件的细节极具挑战性。本文展示了一种基于微光纤周围实验室传感器的有前景的方法，该传感器能够模拟光纤表面的光电催化反应，同时监测反应物浓度变化和催化热生成过程。由于亚微米尺寸的穿透深度和倏逝场的快速响应能力，微光纤周围实验室传感器克服了读取亚微米范围内瞬时表面参数的困难。该传感器原位解析了光和电压分别引起的催化剂表面反应物浓度和温度的变化。它还解码了催化剂组成对不同波长下吸附效率和催化效率的影响，并确定了污染物降解与催化热效应的同步发生。获得了实时参数与催化活性之间的稳定相关性，有助于对催化过程和机理有基本的理解。这种方法填补了当前催化过程和热生成监测方法中的一个重要空白。
