Hydrogen in anatase TiO2

锐钛矿型 TiO2 中的氢

• 批准号: 340321868
• 负责人: Privatdozent Dr. Eduard Lavrov
• 金额: --
• 依托单位: Professur für Halbleiterphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/340321868?language=en
• 关键词: Hydrogen; anatase; TiO2

Since the discovery of photocatalytic splitting of water on titanium dioxide (TiO2) electrodes this semiconductor became an object of intensive research. In nature it occurs in three crystalline modifications: rutile, brookite, and anatase. Higher electron mobility, longer carrier lifetime, and exciton diffusion length make the latter the material of choice for a variety of applications starting from photovoltaic devices and ending with energy renewal and destruction of organic compounds in wastewater. A problem to be solved though is a low efficiency of photocatalysis since due to the wide band gap of TiO2 it harvests only a small fraction of the solar energy. A leap forward was recently achieved via engineering "black" hydrogenated anatase with a much narrower band gap. In spite of this breakthrough, understanding of hydrogen in anatase is limited. The proposed project aims to bridge this gap. Spectroscopic methods will be employed to get insight into the structural and electrical properties of hydrogen with an emphasis on interstitial species, hydrogen trapped at the oxygen vacancy, and hydrogen-acceptor complexes such as the Ti vacancy passivated by hydrogen.

自从在二氧化钛(Ti02)电极上发现光催化分解水的现象以来，这种半导体就成为了人们深入研究的对象。在自然界中，它以三种晶型存在：金红石、钛铁矿和锐钛矿。更高的电子迁移率、更长的载流子寿命和激子扩散长度使后者成为各种应用的首选材料，从光伏器件开始，到能源更新和废水中有机化合物的破坏。然而，一个需要解决的问题是光催化效率低，因为由于二氧化钛的带隙很宽，它只收集了一小部分太阳能。最近，通过设计具有更窄带隙的“黑色”氢化锐钛矿，实现了一次飞跃。尽管取得了这一突破，但人们对锐钛矿中氢的了解仍然有限。拟议中的项目旨在弥合这一差距。光谱方法将被用来深入了解氢的结构和电学性质，重点是间隙物种，捕获在氧空位上的氢，以及被氢钝化的氢-受体复合体，如钛空位。