功能氧化钛的研究进展。II:氢修饰TiO2

IF 9.1 2区 化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR Progress in Solid State Chemistry Pub Date : 2019-09-01 DOI:10.1016/j.progsolidstchem.2019.04.003
Nazanin Rahimi , Randolph Pax , Evan MacA. Gray
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引用次数: 14

摘要

二氧化钛的带隙工程吸引了许多研究人员希望扩展其作为功能材料的适用性。虽然二氧化钛已经在利用其特殊性能的应用中商业化,但它的带隙应该被修改以提高其性能,特别是作为一种活性光催化剂。在氢气气氛下还原TiO2是一种很有前途的方法,它可以提高TiO2的可见光吸收效率,增强其电化学和其他与电子能带结构相关的性能。在第二篇综述中,综述了二氧化钛常见相在真空和氢气条件下O空位(VO)和其他缺陷(如间隙阳离子)的产生及其影响。详细讨论了从晶体结构中随机去除O的特殊改性TiO2-x。尽管早期的证据表明氢被吸收到TiO2的主体中,但近年来氢的作用变得有争议,有人声称表面紊乱是暴露于氢引起的光活性增强的原因。许多已发表的实验和密度功能理论模型研究被调查,目的是确定什么是同意的或有争议的,并将缺陷结构与能带结构联系起来。结论是,需要进一步的工作来阐明缺陷产生和扩散的机制,以及在真空或氢气处理后观察到的许多样品颜色的来源。
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Review of functional titanium oxides. II: Hydrogen-modified TiO2

Band gap engineering of TiO2 has attracted many researchers looking to extend its applicability as a functional material. Although TiO2 has been commercialised in applications that utilise its special properties, its band gap should be modified to improve its performance, especially as an active photo catalyst. Reduction of TiO2 under a hydrogen atmosphere is a promising method which can increase the visible-light absorption efficiency of TiO2 and enhance its electrochemical and other properties related to electronic band structure. In this second review paper, the production and influence of O vacancies (VO) and other defects, such as interstitial cations, under vacuum and hydrogen are reviewed for the common phases of TiO2. The particular modification TiO2–x in which O is randomly removed from the crystal structure is considered in detail. Despite early evidence that hydrogen is absorbed into the bulk of TiO2, the action of hydrogen has become controversial in recent years, with claims that surface disorder is responsible for the enhanced photoactivity induced by exposure to hydrogen. The many published experimental and density-functional-theory modelling studies are surveyed with the aims of determining what is agreed or contested, and relating defect structure to band structure. It is concluded that further work is needed to clarify the mechanisms of defect production and defect diffusion, as well as the origins of the numerous sample colours observed following treatment in vacuum or hydrogen.

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来源期刊
Progress in Solid State Chemistry
Progress in Solid State Chemistry 化学-无机化学与核化学
CiteScore
14.10
自引率
3.30%
发文量
12
期刊介绍: Progress in Solid State Chemistry offers critical reviews and specialized articles written by leading experts in the field, providing a comprehensive view of solid-state chemistry. It addresses the challenge of dispersed literature by offering up-to-date assessments of research progress and recent developments. Emphasis is placed on the relationship between physical properties and structural chemistry, particularly imperfections like vacancies and dislocations. The reviews published in Progress in Solid State Chemistry emphasize critical evaluation of the field, along with indications of current problems and future directions. Papers are not intended to be bibliographic in nature but rather to inform a broad range of readers in an inherently multidisciplinary field by providing expert treatises oriented both towards specialists in different areas of the solid state and towards nonspecialists. The authorship is international, and the subject matter will be of interest to chemists, materials scientists, physicists, metallurgists, crystallographers, ceramists, and engineers interested in the solid state.
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