High-Temperature Surface Dynamics of Transition-Metal Oxides

该基金的研究目标是确定负责催化活性过渡金属氧化物（如二氧化钛（TiO 2））高温表面稳定性的原子尺度机制。 由于催化性能主要取决于表面原子结构和组成，具有所需化学计量的稳定表面对于上级寿命性能至关重要。 相对知之甚少的是气体化学对高温表面组成和缺陷结构的TiO 2的影响。 本研究将利用原位高温扫描隧道显微镜和低能电子显微镜技术，建立金红石结构TiO 2（110）表面形态、结构和组成演化的动力学。如果成功，本研究计划将导致高性能过渡金属氧化物催化剂和催化剂载体材料、热光催化剂和其他器件的开发。 该项目将鼓励代表性不足的学生参与，并提高高中生在加州大学洛杉矶分校接受科学和工程高等教育的意识。 研究结果将纳入课程，以使学生受益，并通过演讲和出版物传播。 将组织一次重点会议，强调表面和界面动力学的原位显微镜研究，以提高对这一主题的认识。

The research objective of this grant is to determine the atomic-scale mechanisms responsible for high-temperature surface stability of catalytically-active transition-metal oxides such as titanium dioxide (TiO2). Since catalytic performance depends critically on the surface atomic structure and composition, a stable surface with desired stoichiometry is critical for superior lifetime performance. Relatively little is known concerning the effect of gas chemistry on high-temperature surface composition and defect structure of TiO2. This investigation will use in situ high-temperature scanning tunneling microscopy and low-energy electron microscopy techniques and establish the dynamics of surface morphological, structural, and compositional evolution on rutile-structured TiO2(110).If successful, this research program will lead to the development of high-performance transition-metal oxide catalysts and catalyst support materials, thermophotovoltaics, and other devices. The project will encourage the participation of underrepresented students and promote awareness among high-school students to pursue higher education in science and engineering at UCLA. Research results will be integrated into courses for the benefit of students and disseminated through presentations and publications. A focused session emphasizing in situ microscopy studies of surface and interface dynamics will be organized to enhance awareness about this topic.