Formation and stabilisation mechanisms of defects in carbon-doped and self-doped titanate nanotubes

碳掺杂和自掺杂钛酸盐纳米管缺陷的形成和稳定机制

基本信息

项目摘要

Titanate nanotubes (TNT), are a known type of inorganic, oxidic nanotubes, which can be doped with carbon to achieve C-TNT in order to alter the electric behaviour of the material. The synthesis procedure for C-TNTs described in the proposal ensures that a high specific surface area can be reached. The doped nanotubes thus meet the specifications for PEM fuel cell catalyst support such as high surface area and high electronic conductivity. However, the mechanisms behind the synthesis procedure and the origin of high conductivity are not clarified up to now. During the synthesis process, titanium oxide is treated in hot aqueous alkaline solution. After a certain process time, titanate nanotubes can be separated from the solution. The formation process of the tubes is still discussed controversially. A peeling scrolling mechanism is suggested as well as dissolution and precipitation. The synthesis and properties of the nanotubes is reproducible but further research work is necessary to understand the process and the material properties. The goal of the project is to provide further insight into the structure and structure formation of carbon-doped titanate nanotubes. Main questions are: How is carbon incorporated into the precursor powder and in the nanotubes? Is there any cooperative effect between titanium oxidation state, carbon and point defects in the structure? What changes in the structure are responsible for the enhanced electronic conductivity of the nanotube material? Results obtained could have impact on the further development of catalysts and catalyst supports, not only for fuel cell technology but also for catalysis and related processes in general.We assume that in reducing atmosphere during carbothermal treatment of the precursor powder Ti4+ species are reduced to Ti3+ and oxygen vacancies are formed and stabilised by carbon atoms. In our experimental approach, hydrogen is present due to the decomposition of acetylene during the carbothermal treatment of TiO2 powders at temperatures 700 – 800 °C, which should provoke Ti3+ species and oxygen vacancies.It is of great interest whether such defects can be transferred from C-TiO2 to C-TNTs during hydrothermal treatment in sodium hydroxide and how they affect the electrical properties of C-TNTs. The objective of the planned project is the investigation of C-doped titanium oxide nanotubes, with the goal to elucidate the location of the carbon in the structure and to clarify the formation mechanism with respect to the dopant and their influence on the C-TNT.
钛酸盐纳米管(TNT)是一种已知类型的无机氧化型纳米管,可以在碳中掺杂以实现C-TNT,从而改变材料的电性能。建议中描述的C-TNTs的合成过程确保了可以达到高比表面积。因此,掺杂的纳米管满足了PEM燃料电池催化剂载体的要求,如高比表面积和高电子传导性。然而,合成过程背后的机理和高电导率的来源到目前为止还不清楚。在合成过程中,二氧化钛在热的碱性水溶液中进行处理。经过一定的处理时间后,钛酸盐纳米管可以从溶液中分离出来。管子的形成过程仍有争议。提出了剥离卷曲机制和溶解析出机制。纳米管的合成和性质是可重复性的,但需要进一步的研究工作来了解工艺和材料性质。该项目的目标是进一步深入了解碳掺杂钛酸盐纳米管的结构和结构形成。主要问题是:碳是如何结合到前体粉末和纳米管中的?钛的氧化态、碳和结构中的点缺陷之间是否存在协同效应?结构上的哪些变化是导致纳米管材料电子导电性增强的原因?所获得的结果可能对催化剂和催化剂载体的进一步发展产生影响,不仅对于燃料电池技术,而且对于催化和相关工艺。我们假设在碳热处理前驱体粉末的还原气氛中,Ti4+物种被还原为Ti3+,并形成氧空位并由碳原子稳定。在我们的实验方法中,二氧化钛粉末在700-800℃的碳热处理过程中,由于乙炔的分解而存在氢,这应该会引起Ti3+物种和氧空位的产生。人们非常感兴趣的是,在氢氧化钠水热处理过程中,这种缺陷是否会从C-二氧化钛转移到C-TNTs中,以及它们对C-TNTs的电学性质有什么影响。计划项目的目标是研究碳掺杂的二氧化钛纳米管,目的是阐明碳在结构中的位置,并阐明相对于掺杂剂的形成机理及其对C-TNT的影响。

项目成果

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Professorin Dr. Uta Helbig其他文献

Professorin Dr. Uta Helbig的其他文献

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{{ truncateString('Professorin Dr. Uta Helbig', 18)}}的其他基金

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
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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