Nie J, Patrocinio A O T, Hamid S, Sieland F, Sann J, Xia S, Bahnemann D W, Schneider J
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Songling Road 238, 266100 Qingdao, China.
Phys Chem Chem Phys. 2018 Feb 14;20(7):5264-5273. doi: 10.1039/c7cp07762a.
Cu nanoparticles were deposited on the surface of commercial TiO nanoparticles (Cu-TiO) using different methods aiming at the production of highly efficient visible light photocatalysts. Photocatalytic H evolution rates obtained from methanol/water mixtures revealed no significant influence of the presence of copper oxides on the photoreaction upon visible light illumination. The photocatalytic H production rates were evaluated upon illumination with different spectral ranges (≥420 nm or ≥500 nm) and the results evidenced that the visible light induced charge carrier formation on the Cu-TiO photocatalysts consists of two distinct pathways: the direct excitation of TiO and the induced excitation by the so-called surface plasmon resonance (SPR) effect of the Cu nanoparticles on the TiO surface. Both pathways are present when the full visible range of the spectrum is used (≥420 nm), while for illumination at longer wavelengths (≥500 nm), the photocatalytic activity is solely promoted by the Cu-SPR effect. Electron paramagnetic resonance (EPR) and laser flash photolysis measurements were performed to clarify the underlying mechanism of Cu-TiO photocatalysts upon visible light illumination.
采用不同方法将铜纳米颗粒沉积在商用二氧化钛纳米颗粒（Cu-TiO）表面，旨在制备高效可见光光催化剂。由甲醇/水混合物得到的光催化析氢速率表明，可见光照射下，氧化铜的存在对光反应没有显著影响。在不同光谱范围（≥420 nm或≥500 nm）照射下评估了光催化产氢速率，结果表明，Cu-TiO光催化剂上可见光诱导的电荷载流子形成有两条不同途径：TiO的直接激发和Cu纳米颗粒在TiO表面的所谓表面等离子体共振（SPR）效应诱导的激发。当使用整个可见光谱范围（≥420 nm）时，两条途径都存在，而对于较长波长（≥500 nm）的照射，光催化活性仅由Cu-SPR效应促进。进行了电子顺磁共振（EPR）和激光闪光光解测量，以阐明可见光照射下Cu-TiO光催化剂的潜在机制。
