| 报告题目 | Atomic-level investigation of photocatalytic micromechanism on well-defined TiO2 surface from UHV to |
| 报告人 | 李方亮 博士 |
| 报告人单位 | Institute of Chemistry, Carl von Ossietzky University of Oldenburg |
| 报告时间 | 2026-04-16 15:30:00 |
| 报告地点 | 高新区交叉中心334会议室 |
| 主办单位 | 合肥微尺度物质科学国家研究中心 |
| 报告介绍 | 报告摘要： Nowadays, photocatalysis has been emerging as a promising method for the activation and conversion of hydrocarbons under mild conditions. As a prototype, TiO2 is widely used to investigate the photocatalytic oxidative dehydrogenation of hydrocarbons. Despite the great advances, the underlying mechanisms that govern the conversion efficiency and product selectivity remain unclear, and it is still an open question of how light modulates the reaction channels of hydrocarbons relative to photo and thermal processes over TiO2. Over the past decade, our research group has systematically investigated the microkinetic mechanism of photo- and thermocatalytic dehydrogenation of small alkanes and aromatic hydrocarbons on welldefined single-crystal surfaces of rutile TiO₂ under ultrahigh vacuum (UHV) conditions, using advanced surface science characterization techniques (e.g., TPD, TOF) combined with theoretical calculations. The investigation on a series of homologous compounds can guide the rational design and optimization of practical catalysts. Nonetheless, considering the“pressure gap”, further extending to near ambient pressures (NAP) and in-situ measurements renders the reaction system closer to applied catalysis to overcome this barrier. Herein, we present a NAP microreactor that allows for evaluating the catalytic performance of well-defined flat model catalysts over semiconductors, such as modified TiO2. It is integrable with existing UHV setups and thus allows in-vacuo access to UHV surface preparation techniques and atomic-level characterization. After contamination-free sample transfer, the microreactor is capable of online, real-time catalytic testing in ambient conditions (at least 1 atm) in the temperature range up to 450 K. In this way, the catalytic behavior of the identical photocatalytic system at varying pressures can be fully investigated from ultrahigh vacuum (UHV) to near-ambient pressure, which will greatly facilitate the bridging from model catalysts to practical catalysis and genuinely reflect the value of fundamental scientific research.报告人简介： Dr. Fangliang Li is currently a Postdoctoral Fellow at the Institute of Chemistry, Carl von Ossietzky University of Oldenburg, Germany. He received his Ph.D. in Physical Chemistry from the University of Chinese Academy of Sciences in 2020 under the supervision of Prof. Xueming Yang. Dr. Li has conducted postdoctoral research at Southern University of Science and Technology (China), and the University of South Carolina (USA). Dr. Li’s research interests focus on surface science. He has strong expertise in designing, building, and controlling complex ultra-high vacuum (UHV) and NAP experimental setups, and is skilled in mass spectrometry (TPD, TOF), electronic spectroscopy (NAP-XPS, AES), and various laser systems. Dr. Li has published a series of papers in journals such as JACS Au, Chemical Science, J. Phys. Chem. Lett., and Surf. Sci. etc.. He has presented his work at major international conferences (ECOSS-38, Bunsen-Tagung, CCS annual meetings, etc.). |
