2022年8月4日
Effect of Surface Plasmon Resonance and the Heterojunction on Photoelectrochemical Activity of Metal-Loaded TiO2 Electrodes under Visible Light Irradiation
The Journal of Physical Chemistry C
- ,
- ,
- 巻
- 126
- 号
- 開始ページ
- 12450
- 終了ページ
- 12459
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/acs.jpcc.2c02649
- 出版者・発行元
- AMER CHEMICAL SOC
This study examines the influence of surface plasmon resonance (SPR) and the semiconducting heterojunction on the photoelectrochemical (PEC) activity of metal-loaded TiO2 electrodes under visible light irradiation. Different metal nanoparticles (including Au, Ag, Rh, and Cu) have been selected deliberately and deposited on the TiO2 electrode layers via photodeposition and subsequent annealing at 300 degrees C. UV-vis spectra show an increased absorbance in the visible light region with the metal loading. X-ray photon spectroscopy reveals the formation of CuO, Ag2O, and Ru2O3 after annealing, while only Au remains in its metallic state. The PEC activity increases in the ascending order of Cu < Au < Rh < Ag. This is consistent with the electrochemical impedance measurement where the Ag-loaded TiO2 electrode shows the lowest charge transfer resistance together with the highest ion diffusion rate. Our findings suggest that the presence of semiconducting p-n heterojunctions with associated oxygen-vacancy defects facilitates the enhanced PEC activity by reducing the electron-hole recombination in addition to the SPR effect.
- リンク情報
- ID情報
-
- DOI : 10.1021/acs.jpcc.2c02649
- ISSN : 1932-7447
- eISSN : 1932-7455
- ORCIDのPut Code : 116296937
- Web of Science ID : WOS:000838001300001