Local charge carrier dynamics of a particulate Ga-doped La<sub>5</sub>Ti<sub>2</sub>Cu<sub>0.9</sub>Ag<sub>0.1</sub>O<sub>7</sub>S<sub>5</sub> photocatalyst and the impact of Rh cocatalysts
Local charge carrier dynamics of a particulate Ga-doped La<sub>5</sub>Ti<sub>2</sub>Cu<sub>0.9</sub>Ag<sub>0.1</sub>O<sub>7</sub>S<sub>5</sub> photocatalyst and the impact of Rh cocatalysts
复制标题
颗粒状 Ga 掺杂 La<sub>5</sub>Ti<sub>2</sub>Cu<sub>0.9</sub>Ag<sub>0.1</sub>O<sub> 的局部载流子动力学
DOI：
10.1039/d2cp02808e
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发表时间：
2022
影响因子：
3.3
通讯作者：
Katayama Kenji
中科院分区：
文献类型：
--
作者：
Chugenji Tatsuya;Pan Zhenhua;Nandal Vikas;Seki Kazuhiko;Domen Kazunari;Katayama Kenji
可见光响应光催化材料有望在光催化水分解中得到实际应用。一个有前途的材料作为一个p型半导体，氧硫化物，进行了研究的局部电荷载流子的行为，为每个粒子通过使用一个自制的时间分辨显微技术结合聚类分析。我们可以区分电子和空穴捕获到表面态和随后的复合在微米尺度上从纳秒到微秒的顺序。电荷载流子类型的图显示，电子和空穴的电荷捕获位点在每个颗粒/聚集体内空间分离。此外，铑助催化剂的效果被认为是一个新的电子途径，捕获到铑网站和以下的重组，这是延迟相比，原来的电子重组过程。基于唯象模拟对Rh效应进行了讨论，揭示了其衰减的可能原因是载流子在硫氧化物中的各向异性扩散或界面处的界面能垒。
Visible-light responsive photocatalytic materials are expected to be deployed for practical use in photocatalytic water splitting. One of the promising materials as a p-type semiconductor, oxysulfides, was investigated in terms of the local charge carrier behavior for each particle by using a home-built time-resolved microscopic technique in combination with clustering analysis. We could differentiate electron and hole trapping to the surface states and the following recombination on a micron-scale from the nanosecond to microsecond order. The map of the charge carrier type revealed that charge trapping sites for electrons and holes were spatially separated within each particle/aggregate. Furthermore, the effect of the rhodium cocatalyst was recognized as a new electron pathway, trapping to the rhodium site and the following recombination, which was delayed compared with the original electron recombination process. The Rh effect was discussed based on the phenomenological simulation, revealing a possible reason for the decay was due to the anisotropic diffusion of charge carriers in oxysulfides or the interfacial energy barrier at the interface.