School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China.
Dalton Trans. 2010 Nov 28;39(44):10692-6. doi: 10.1039/c0dt00448k. Epub 2010 Oct 11.
Anchored visible-light-absorbing TiO(2) films have been synthesized by the layer-by-layer method on a quartz slide substrate as a new class of visible light-sensitive photocatalyst. UV-vis, XRD and XPS spectra show that W and Mn enter the TiO(2) lattices and partially substitute for Ti, and that W appears to have a solubility limit into the anatase structure. The Mn and W dopants cause new electronic states above the valence-band edge of pure TiO(2), and the new electronic states may be directly related to the visible-light absorption of doped TiO(2) films. A constant H(2) generation rate is obtained for long periods of time for all the investigated TiO(2) films, and the H(2) production rates for titania films doped with 0.74 at% W (relative to Ti) are 4.1 and 3.3 times higher than that of non-doped TiO(2) under UV and visible light, respectively, as the dopant atoms not only restrict the band gap to the visible region, but also facilitate the detrapping of charge carriers to the surface of the catalyst.
锚定可见光吸收 TiO(2) 薄膜已通过层层法在石英玻片基底上合成，作为一类新型的可见光敏光催化剂。UV-vis、XRD 和 XPS 光谱表明，W 和 Mn 进入 TiO(2) 晶格并部分取代 Ti，并且 W 似乎对锐钛矿结构具有溶解度极限。Mn 和 W 掺杂剂在纯 TiO(2) 的价带边缘上方产生新的电子态，并且新的电子态可能与掺杂 TiO(2) 薄膜的可见光吸收直接相关。对于所有研究的 TiO(2) 薄膜，在很长一段时间内都获得了恒定的 H(2) 生成速率，并且掺杂 0.74 at% W（相对于 Ti）的 TiO(2) 薄膜的 H(2) 生成速率分别比未掺杂 TiO(2) 高 4.1 倍和 3.3 倍在紫外光和可见光下，因为掺杂原子不仅将带隙限制在可见光区，而且还促进了载流子从催化剂表面的解陷阱。
