Dependence of Activity of Rutile Titanium(IV) Oxide Powder for Photocatalytic Overall Water Splitting on Structural Properties
Dependence of Activity of Rutile Titanium(IV) Oxide Powder for Photocatalytic Overall Water Splitting on Structural Properties
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DOI：
10.1021/jp502949q
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发表时间：
2014-05-01
影响因子：
3.7
通讯作者：
Ohno, Teruhisa
中科院分区：
文献类型：
--
作者：
Maeda, Kazuhiko;Murakami, Naoya;Ohno, Teruhisa
研究了具有3.0 eV带隙的金红石TiO 2粉末作为光催化剂用于整体水分解的结构性质。通过X射线衍射、扫描电子显微镜、光声光谱和光电化学技术对金红石型TiO 2样品的结构进行了表征。结果发现，金红石型TiO 2颗粒的光催化活性的反应表现出较低的表面捕获状态，减缓水氧化动力学，以及空间上分离的还原/氧化位点暴露的晶面密度。这项研究还表明，金红石型TiO 2的光催化活性的整体水裂解，即使当材料结晶良好，是敏感的缺陷存在于（或附近）的表面，而不是在散装晶体。
Rutile TiO2 powder having a band gap of 3.0 eV was studied as a photocatalyst for overall water splitting with respect to structural properties. The structures of rutile TiO2 samples were characterized by means of X-ray diffraction, scanning electron microscopy, photoacoustic spectroscopy, and a photoelectrochemical technique. It was found that rutile TiO2 particles that are photocatalytically active for the reaction exhibit a lower density of surface trapping states that slow water oxidation kinetics, as well as spatially separated reduction/oxidation sites at exposed crystal faces. This study also demonstrated that the photocatalytic activity of rutile TiO2 for overall water splitting, even when the material was well crystallized, was sensitive to defects that exist in (or near) the surface rather than in the bulk crystal.