表面等离子共振
闪光光解
光催化
材料科学
可见光谱
光化学
光谱学
电子
共振(粒子物理)
带隙
电子转移
电子顺磁共振
等离子体子
光电子学
原子物理学
化学
纳米颗粒
纳米技术
物理
核磁共振
动力学
催化作用
量子力学
生物化学
反应速率常数
作者
Jinlin Nie,Jenny Schneider,Fabian Sieland,Long Zhang,Shuwei Xia,Detlef W. Bahnemann
出处
期刊:RSC Advances
[The Royal Society of Chemistry]
日期:2018-01-01
卷期号:8 (46): 25881-25887
被引量:31
摘要
The Surface Plasmon Resonance (SPR) driven photocatalytic H2 production upon visible light illumination (≥500 nm) was investigated on gold-loaded TiO2 (Au-TiO2). It has been clearly shown that the Au-SPR can directly lead to photocatalytic H2 evolution under illumination (≥500 nm). However, there are still some open issues about the underlying mechanism for the SPR-driven photocatalytic H2 production, especially the explanation of the resonance energy transfer (RET) theory and the direct electron transfer (DET) theory. In this contribution, by means of the EPR and laser flash photolysis spectroscopy, we clearly showed the signals for different species formed by trapped electrons and holes in TiO2 upon visible light illumination (≥500 nm). However, the energy of the Au-SPR is insufficient to overcome the bandgap of TiO2. The signals of the trapped electrons and holes originate from two distinct processes, rather than the simple electron-hole pair excitation. Results obtained by Laser Flash Photolysis spectroscopy evidenced that, due to the Au-SPR effect, Au NPs can inject electrons to the conduction band of TiO2 and the Au-SPR can also initiate e-/h+ pair generation (interfacial charge transfer process) upon visible light illumination (≥500 nm). Moreover, the Density Functional Theory (DFT) calculation provided direct evidence that, due to the Au-SPR, new impurity energy levels occurred, thus further theoretically elaborating the proposed mechanisms.
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