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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Study of the photoelectrochemical cathodic protection mechanism for steel based on the SrTiO3-TiO2 composite
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Study of the photoelectrochemical cathodic protection mechanism for steel based on the SrTiO3-TiO2 composite

机译：基于SRTIO3-TiO2复合材料的钢材光电化学阴极保护机理研究

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摘要

Up to now the mechanism of the photoelectrochemical (PEC) cathodic protection of the semiconductor materials is still unclear. In this work, the conduction band (CB) potential of the SrTiO3-TiO2 composite was regulated by controlling the deposition amount of SrTiO3 on the surface of TiO2 nanotube arrays. When the hydrothermal treating time was 1 h, the prepared SrTiO3-TiO2 photoanode (denoted as SrTiO3-TiO2-1) exhibited the most excellent PEC cathodic protection performance for 304 stainless steel and Q235 carbon steel in NaCl electrolyte. Further analysis indicates that the PEC cathodic protection performance of the photoanode is determined by the CB potential of the n-type semiconductor material, the separation efficiency of the photogenerated electron-hole pairs and the redox potential of the electrolyte. Among them, sufficient negative CB potential is the prerequisite for providing the PEC cathodic protection for the coupled metals. Under this premise, the higher the separation efficiency of the photogenerated electron-hole pairs and the more negative redox potential of the electrolyte are, a more negative potential of the coupled metal can be cathodically polarized to under the illumination of incident light with suitable wavelength. (C) 2017 Elsevier B.V. All rights reserved.
机译：到目前为止，光电化学（PEC）阴极保护的半导体材料的机制仍不清楚。在这项工作中，通过控制TiO 2纳米管阵列的表面上的SRTIO3的沉积量来调节SRTIO3-TiO2复合物的导通带（Cb）电位。当水热处理时间为1小时时，制备的SRTIO3-TiO2光电（表示为SRTIO3-TiO2-1），在NaCl电解质中为304个不锈钢和Q235碳钢提供最优异的PEC阴极保护性能。进一步的分析表明，光电码的PEC阴极保护性能由N型半导体材料的CB电位决定，光发成的电子 - 空穴对的分离效率和电解质的氧化还原电位。其中，足够的负CB潜力是为偶联金属提供PEC阴极保护的先决条件。在该前提下，光发化电子 - 空穴对的分离效率越高，电解质的更负氧化还原电位，耦合金属的更负电位可以是阴极偏振，在具有合适波长的入射光的照明下。 （c）2017年Elsevier B.V.保留所有权利。

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