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New insights into the relationship between structure and photocatalytic properties of TiO2 catalysts

机译：TiO2催化剂的结构与光催化性能之间关系的新见解

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摘要

This work systematically investigated the relationship between structure, morphology, photoelectrochemical (PEC) and photocatalytic (PC) properties of TiO2 catalysts. A series of TiO2 catalysts with various phase compositions (anatase-, brookite-and finally rutile-rich samples) and morphologies (1D morphology, rhomboid nanoparticles (NPs) and flower-like assemblies of nanorods) were prepared by an acidic hydrothermal treatment of hydrogen titanate nanofibres (H-TNFs). The structures of the samples, such as crystal phase composition and their spatial distribution, were extensively characterised, and the samples were tested for photocatalytic degradation of ethanol. A strong correlation is found between PEC and PC properties. PEC measurements revealed that the brookite-rich samples generated high but unstable photocurrents. The anatase and rutile-rich samples showed good stability, but for the rutile-rich samples low photocurrents were detected due to the poor conductivity of this polymorph. In contrast, the sample containing 93.2% anatase and 6.8% brookite with elongated morphology not only showed the ability to generate high photocurrents but also maintained a stable photoresponse upon an extended period of time, because of its well-balanced bi-crystalline structure and elongated morphology. Therefore, the abilities to generate high photocurrents and to maintain a stable photoresponse are equally important and probably a prerequisite for a good photocatalyst.
机译：这项工作系统地研究了TiO2催化剂的结构，形态，光电化学（PEC）和光催化（PC）性能之间的关系。通过对氢气进行酸性水热处理，制备了一系列具有各种相组成（锐钛矿，板钛矿，最后是金红石的样品）和形态（一维形态，菱形纳米颗粒（NP）和花状纳米棒组装体）的TiO2催化剂。钛酸酯纳米纤维（H-TNF）。广泛表征了样品的结构，如晶相组成及其空间分布，并对样品进行了乙醇的光催化降解测试。发现PEC和PC性能之间存在很强的相关性。 PEC测量表明，富含板钛矿的样品产生了高但不稳定的光电流。锐钛矿和富含金红石的样品显示出良好的稳定性，但是对于富含金红石的样品，由于该多晶型物的导电性差，因此检测到低的光电流。相反，包含93.2％锐钛矿和6.8％板钛矿的具有细长形貌的样品，由于其良好的双晶结构和细长的结构，不仅显示出产生高光电流的能力，而且在较长的时间段内保持了稳定的光响应。形态学。因此，产生高光电流和保持稳定的光响应的能力同等重要，并且可能是良好光催化剂的先决条件。

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