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首页> 外文期刊>RSC Advances >Improving the photoelectrocatalytic performance of boron-modified TiO2/Ti sol–gel-based electrodes for glycerol oxidation under visible illumination
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Improving the photoelectrocatalytic performance of boron-modified TiO2/Ti sol–gel-based electrodes for glycerol oxidation under visible illumination

机译：可见光下，提高硼改性TiO2 / Ti溶胶 - 甘油氧化电极的光电催化性能

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The effect of preparation variables such as the amount of water, the number of layers and the heating rate on the photoelectrocatalytic properties of boron-modified TiO _(2) sol–gel thin films was investigated. Materials were prepared by the sol–gel method and the deposition of a B-TiO _(2) film on Ti substrates by the dip-coating technique. The surface and chemical environment of the films was characterized by FESEM, DRS, XPS, and Raman spectroscopy and their photoelectrochemical properties were studied by voltammetry and photocurrent transient measurements under visible light. FESEM micrographs exhibit a cracked surface as a result of the increase of the capillary pressure in the films during drying to increase the number of layers. The Raman spectra show that the anatase phase was obtained during thermal treatment at 450 °C. Films employed as photoelectrodes in a three-electrode cell generated a higher photocurrent than the TiO _(2) film without modification did due to the presence of boron, which favors the formation of Ti ~(3+) donor states identified by XPS, photogenerating more electrons in the semiconductor and promoting their transport to the substrate. The donor state density was estimated by Mott–Schottky plots. The highest photoresponse was obtained using a one-layer B-TiO _(2) film. In the presence of 1 M glycerol at pH 1, the photocurrent generated by the B-TiO _(2) films was increased about twice compared with the photocurrent observed in the absence of the organic, as a result of electron injection to the conduction band of TiO _(2) from the molecule during its oxidation in the film/electrolyte solution interface, promoting the current doubling effect.
机译：研究了制备变量，例如水的量，层数和加热速率对硼改性的TiO_（2）溶胶薄膜的光电催化性质上的加热速率。通过浸涂技术通过溶胶 - 凝胶法制备溶胶 - 凝胶法和Ti基板上的B-TiO _（2）膜的沉积。薄膜的表面和化学环境的特征在于FESEM，DRS，XPS和拉曼光谱，通过伏安法和光电流瞬态测量研究其光电化学性质。 FeSEM显微照片由于在干燥期间薄膜中的毛细管压力增加而表现出裂化的表面，以增加层数。拉曼光谱表明在450℃的热处理期间获得锐钛​​矿相。由于三电极电池中的光电极使用的薄膜产生比TiO _（2）薄膜产生更高的光电流，而不会因硼的存在而产生的，这有利于XPS鉴定的Ti〜（3+）供体状态的形成，光生成在半导体中更多的电子并促进其运输到基板。由Mott-Schottky图估算供体状态密度。使用单层B-TiO _（2）膜获得最高光响应。在pH 1的1M甘油在内，与在没有有机的情况下观察到的光电流，通过电子注射到导通带，由B-TiO _（2）膜产生的光电流增加两次在膜/电解质溶液界面中氧化过程中的分子中的TiO_（2），促进电流倍增效果。

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