Hung Wei Hsuan, Lai Sz Nian, Lo An Ya
†Department of Materials Science and Engineering, Feng-Chia University, Taichung 407, Taiwan.
‡Department of Chemical and Materials Engineering, National Chin-Yi University of Technology, Taiping 411, Taiwan.
ACS Appl Mater Interfaces. 2015 Apr 29;7(16):8412-8. doi: 10.1021/am508684e. Epub 2015 Apr 15.
The enhanced water splitting photocurrent has been observed through plasmonic mesoporous composite electrode TiO2-CMK-3/Ag under visible light irradiation. Strong light absorption achieved from the integrations of ordered mesoporous carbon (CMK-3) and silver plasmonic nanoparticles (NPs) layer in the TiO2, which significantly increased the effective optical depth of TiO2-CMK-3/Ag photoelectrode. The carbon-based CMK-3 also increased the surface wetting behavior and conductivity of the photoelectrodes, which resulted in a higher ion exchange rate and faster electron transport. The synthesis of high crystalline TiO2-CMK-3/Ag composite photocatalyst was verified by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Pronounced enhancement of light absorption of TiO2-CMK-3/Ag photoelectrode was confirmed by UV/vis spectrophotometers. Two orders of magnitude of the enhanced water splitting photocurrent were obtained in the TiO2-CMK-3/Ag composite photoelectrode with respect to TiO2 only. Finally, spatially resolved mapping photocurrents were also demonstrated in this study.
在可见光照射下，通过等离子体介孔复合电极TiO2-CMK-3/Ag观察到了增强的水分解光电流。有序介孔碳（CMK-3）和银等离子体纳米颗粒（NPs）层整合到TiO2中实现了强光吸收，这显著增加了TiO2-CMK-3/Ag光电极的有效光学深度。碳基CMK-3还提高了光电极的表面润湿性和导电性，从而导致更高的离子交换率和更快的电子传输。通过X射线衍射（XRD）和扫描电子显微镜（SEM）验证了高结晶TiO2-CMK-3/Ag复合光催化剂的合成。紫外/可见分光光度计证实了TiO2-CMK-3/Ag光电极的光吸收显著增强。相对于仅TiO2，在TiO2-CMK-3/Ag复合光电极中获得了两个数量级的增强水分解光电流。最后，本研究还展示了空间分辨映射光电流。
