The effect of Co into the titanium oxide matrix as photocatalysts in the generation of hydrogen from water is herein reported. Ti–Co mixed oxides and pure titania were synthetized by sol-gel. The Co content was 0, 1, 3, 5, and 10 wt.%. The solids were characterized by Scanning electron microscope-energy dispersive spectrometer (SEM-EDS), N 2 physisorption, X-ray difrraction (XRD), ultraviolet visible spectroscopy (UV–Vis), spectroscopy Raman, X-ray photoelectron spectroscopy (XPS) spectroscopy and High resolution transmission electron microscope (HRTEM). The results showed that the mixed oxides show larger specific surface areas (73–186 m 2 /g) compare to that of pure TiO 2 (64 m 2 /g). The XRD patterns of the Ti-Co samples resemble that of anatase and segregation of Co was not observed by this technique. The band gap energies of these solids vary from 3.05 to 2.85 eV which are smaller than that of pure TiO 2 (3.2 eV). The Ti-Co oxides showed an enhancement in the hydrogen production (∼3056 μmol/h) compare to that of TiO 2 (190 μmol/h) when using UV light. Furthermore, the photocatalytic activity of titania (110 μmol/h) for this reaction was also smaller than those observed for the Ti-Co mixed oxides (∼4056 μmol/h) under visible light.

中文翻译：

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Ti-Co混合氧化物作为光催化剂在水制氢中的应用

本文报道了钴作为光催化剂进入二氧化钛基质中在从水中产生氢气中的作用。采用溶胶-凝胶法合成 Ti-Co 混合氧化物和纯二氧化钛。Co含量为0、1、3、5和10重量％。通过扫描电子显微镜-能量色散光谱仪（SEM-EDS）、N 2 物理吸附、X射线衍射（XRD）、紫外可见光谱（UV-Vis）、光谱拉曼光谱、X射线光电子能谱（XPS）对固体进行表征光谱学和高分辨率透射电子显微镜（HRTEM）。结果表明，与纯 TiO 2 (64 m 2 /g) 相比，混合氧化物的比表面积 (73–186 m 2 /g) 更大。Ti-Co 样品的 XRD 图案类似于锐钛矿的，并且通过该技术没有观察到 Co 的偏析。这些固体的带隙能量从 3.05 到 2.85 eV 不等，小于纯 TiO 2 (3.2 eV) 的带隙能量。与使用紫外光时的 TiO 2 (190 μmol/h) 相比，Ti-Co 氧化物的产氢量 (~3056 μmol/h) 有所提高。此外，在可见光下，二氧化钛的光催化活性（110 μmol/h）也小于 Ti-Co 混合氧化物（~4056 μmol/h）。