Structure and formation mechanism of carbon-doped titanium oxide nanotubes

碳掺杂氧化钛纳米管的结构及形成机理

• 批准号: 324158393
• 负责人: Professorin Dr. Uta Helbig
• 金额: --
• 依托单位: Fakultät Werkstofftechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/324158393?language=en
• 关键词: Structure; formation; mechanism; carbon; doped

Carbon-doped titanium oxide nanotubes are a promising material for several applications such as PEM fuel cells. The nanotubes have a high specific surface area, good electrical conductivity and, as first experiments showed, high oxidation stability.The tubes can be synthesized in alkaline solution via a hydrothermal process from titanium oxide. The oxide powder is transformed into multiwall nanotubes with typical inner diameters of 310 nm and a length up to 500 µm. An anatase-like structure or a titanate structure (H2Ti3O7) is suggested for the tubes. In connection with application, doping of as-produced tubes with various elements is reported in the literature including doping with carbon. The introduction of carbon is essential to achieve electrical conductivity. A common method for carbon doping is a temperature treatment in an acetylene/nitrogen gas flow. Application of this method on tubes leads to sintering and crystallization, however. As a result, only low amounts of tubes persist.To circumvent the disadvantages of thermal post processing, a new method was developed at TH Nürnberg. Instead of the tube material, the titanium oxide precursor powder is doped with carbon via carbothermal treatment. The tubes are synthesized in the hydrothermal process subsequently. The formation process of the tubes is discussed controversially up to now but of high interest for potential application. Therefore, the formation process will be investigated taking samples from the process after various time steps. The samples will be investigated regarding morphology, phase content and carbon incorporation. The information will be correlated with synthesis parameters like concentration of educts, pH value, temperature and duration.On the basis of the results regarding formation mechanism and carbon incorporation further optimization of the synthesis will be possible as a pre-requisite for application.

碳掺杂的氧化钛纳米管是一种有前途的材料，例如PEM Fem fem the tem fem a themem fem the，良好的电导率，正如第一个实验所示，高氧化刺可通过氧化钛的氢化过程转化为多壁。典型的内径为310 thu至500 µm的纳米蛋白酶状结构或滴虫结构（H2TI3O7）被掺入与应用有关的掺杂量。碳的引入对于实现碳掺杂的常见方法是必不可少的。持续存在的热后加工的E缺点，在细节材料上开发了一种新方法，氧化钛粉掺有碳的碳热处理。潜在的应用程序将研究tamples tamples tamples tamples tamples。作为先决条件的可能性，可以进一步优化合成。