TY - JOUR
T1 - Effect of Surface Plasmon Resonance and the Heterojunction on Photoelectrochemical Activity of Metal-Loaded TiO2Electrodes under Visible Light Irradiation
AU - Chang, Chia Yu
AU - Yamakata, Akira
AU - Tseng, Wenjea J.
N1 - Funding Information:
AK would like to acknowledge gratefully the financial support for Grant-in-Aid for Basic Research (B) (19H02820), Transformative Research Areas (A) (Dynamic Exciton: 20H05838), and ENEOS Hydrogen Trust Fund. W.J.T. acknowledges support from the Ministry of Science and Technology (Taiwan) under contract number MOST 110-2221-E-005-015-MY3 as well as experimental assistance from the Taiwan Instrument Research Institute. W.J.T. would also like to thank Prof. Liang-Yih Chen (Chem. Eng. Dept. of NTUST) for the PL characterization, Ms. Juo-Chi Chen at the Instrument Center of the NTHU for providing the EPR measurement and Dr. Jiann-Yeu Chen at the Instrument Center of the NCHU for the Raman characterization. Special thanks to Jia-Hao Chen, Ching-Yuan Lin, and Zi-Hao Jiang for helpful experimental assistance.
Funding Information:
AK would like to acknowledge gratefully the financial support for Grant-in-Aid for Basic Research (B) (19H02820), Transformative Research Areas (A) (Dynamic Exciton: 20H05838), and ENEOS Hydrogen Trust Fund. W.J.T. acknowledges support from the Ministry of Science and Technology (Taiwan) under contract number MOST 110-2221-E-005-015-MY3 as well as experimental assistance from the Taiwan Instrument Research Institute. W.J.T. would also like to thank Prof. Liang-Yih Chen (Chem. Eng. Dept. of NTUST) for the PL characterization, Ms. Juo-Chi Chen at the Instrument Center of the NTHU for providing the EPR measurement, and Dr. Jiann-Yeu Chen at the Instrument Center of the NCHU for the Raman characterization. Special thanks to Jia-Hao Chen, Ching-Yuan Lin, and Zi-Hao Jiang for helpful experimental assistance.
Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.
PY - 2022/8/4
Y1 - 2022/8/4
N2 - This study examines the influence of surface plasmon resonance (SPR) and the semiconducting heterojunction on the photoelectrochemical (PEC) activity of metal-loaded TiO2electrodes under visible light irradiation. Different metal nanoparticles (including Au, Ag, Rh, and Cu) have been selected deliberately and deposited on the TiO2electrode layers via photodeposition and subsequent annealing at 300 °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 Ru2O3after 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 TiO2electrode 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.
AB - This study examines the influence of surface plasmon resonance (SPR) and the semiconducting heterojunction on the photoelectrochemical (PEC) activity of metal-loaded TiO2electrodes under visible light irradiation. Different metal nanoparticles (including Au, Ag, Rh, and Cu) have been selected deliberately and deposited on the TiO2electrode layers via photodeposition and subsequent annealing at 300 °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 Ru2O3after 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 TiO2electrode 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.
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U2 - 10.1021/acs.jpcc.2c02649
DO - 10.1021/acs.jpcc.2c02649
M3 - Article
AN - SCOPUS:85136137056
SN - 1932-7447
VL - 126
SP - 12450
EP - 12459
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 30
ER -