Photoinduced Electrogenerated Chemiluminescence Imaging of Plasmonic Photoelectrochemistry at Single Nanocatalysts,Nano Letters

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Photoinduced Electrogenerated Chemiluminescence Imaging of Plasmonic Photoelectrochemistry at Single Nanocatalysts
Nano Letters ( IF 9.6 ) Pub Date : 2023-05-12 , DOI: 10.1021/acs.nanolett.3c01028
Jing-Wei Xue ₁ , Cong-Hui Xu _{1,

2} , Wei Zhao _{1,

2} , Hong-Yuan Chen ₁ , Jing-Juan Xu ₁

Affiliation

In this study, we proposed a novel imaging technique, photoinduced electrogenerated chemiluminescence microscopy (PECLM), to monitor redox reactions driven by hot carriers on single gold nanoparticles (AuNPs) on TiO₂. Under laser irradiation, plasmon-generated hot carriers were separated by an electric field, leaving hot holes on the surface of AuNPs to drive ECL reactions. PECL intensity was highly sensitive to the number of hot carriers. Through quantitative image analysis, we found that PECL density on individual AuNPs decreased significantly with an increase in particle diameter, indicating that particle size has a significant impact on photoelectrochemical conversion efficiency. For the first time, we verified the feasibility of PECLM in mapping the catalytic activity of single photocatalysts. PECLM opens a new prospect for the in situ imaging of photocatalysis in a high-throughput way, which not only facilitates the optimization of plasmonic photocatalysts but also contributes to the dynamic study of photocatalytic processes on micro/nanointerfaces.

中文翻译：

单纳米催化剂上等离子体光电化学的光致电生化学发光成像

_{在这项研究中，我们提出了一种新的成像技术，即光诱导电化学发光显微镜 (PECLM)，以监测 TiO 2}上单个金纳米粒子 (AuNP) 上热载流子驱动的氧化还原反应. 在激光照射下，等离激元产生的热载流子被电场分离，在 AuNP 表面留下热空穴以驱动 ECL 反应。PECL 强度对热载流子的数量高度敏感。通过定量图像分析，我们发现单个 AuNPs 上的 PECL 密度随着粒径的增加而显着降低，表明粒径对光电化学转换效率有显着影响。我们首次验证了 PECLM 在映射单一光催化剂催化活性方面的可行性。PECLM 以高通量方式为光催化的原位成像开辟了新的前景，这不仅有助于等离子体光催化剂的优化，而且有助于微/纳米界面上光催化过程的动态研究。

更新日期：2023-05-12

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