Dr. Pengfei Cao from Ernst Ruska-Centre, Forschungszentrum Jülich visited our group from December 23rd to 25th. On the 25th, he delivered a presentation titled "Revealing the Morphological and Structural Evolution of Catalysts via in/ex Situ Transmission Electron Microscopy" at the Energy College Campus. The presentation provided a comprehensive introduction to the basic theory of Transmission Electron Microscopy (TEM), the latest developments, and new TEM technologies. Dr. Cao participated in in-depth discussions with staff and Ph.D. students from our group both during and after the meeting.