Abstract:
High spatial resolution, the main feature of transmission electron microscopy, is an indispensible tool for analyzing microstructure of nanocatalytic materials at atomic resolution (e.g., morphology, elemental distribution, interface and surfaces, etc.). More importantly, owing to the development of in-situ electron microscopy, atmospheric gaseous pressure and high-temperature reaction condition are now allowed in transmission electron microscopes, making it possible to observe structural evolution of nanocatalysts during gas-solid interactions. Here, I would like to introduce a couple of examples regarding in-situ atmospheric transmission electron microscopy studies of catalytic nanomaterials, including gas phase growth of Pt-based nanocatalysts, surface reconstruction of Pt nanoparticles under CO oxidation reaction, and coordination evolution of single atomic catalyst under reaction conditions. By observing the atomic-scale dynamic structural evolution of nanocatalysts under atmospheric pressures, fundamental scientific issues, for example, the growth dynamics, the surface reconstruction, and even the catalytic mechanisms of nanocatalysts can be well understood. In addition, I will also look forward to the new techniques and future development in the field of in-situ atmospheric transmission electron microscopy.
报告人简介:
戴升博士,2004年考入清华大学材料科学与工程系,2009年获学士学位。2009年免试攻读清华大学博士学位,师从朱静教授,开展原位电子显微学的研究。2014年获工学博士学位后,在美国密歇根大学(University of Michigan)与加州大学尔湾分校(University of California Irvine)开展纳米催化的原位电子显微学的研究(合作导师为Xiaoqing Pan教授与George Graham教授)。2019年3月回国全职加入华东理工大学化学与分子工程学院,任特聘研究员。