Hummingbird Scientific reposted this
How can perovskite oxide surfaces be altered to improve catalytic properties? SungHyun Jeon, Bong Joong Kim, and WooChul Jung, from Korea Advanced Institute of Science and Technology, Gwangju Institute of Science and Technology, Northwestern University, Sungshin Women's University, Korea Institute of Energy Research, and Seoul National University published recent work characterizing Cu-substituted LCSF perovskite oxide catalyst evolution during oxygen reduction reaction (ORR) using the Hummingbird Scientific gas heating TEM sample holder (https://lnkd.in/gwV-vim). Microstructural and chemical changes were characterized by in-situ TEM, STEM-EDS, and ex-situ SEM. In-situ imaging at elevated temperatures revealed concurrent surface amorphization of the perovskite alongside the formation of multicomponent metal nanocatalysts which decorate the surface. After extended reaction time, the amorphous layer is resistant to a high-temperature oxidizing atmosphere, leading to significant increase in the electrode resistance to ORR without significant degradation. The fabricated metal-based perovskite oxide electrode demonstrated a remarkable improvement in activity and durability, with applications in high-temperature redox-dynamic nanoarchitecture catalyst structures. See the comments below for a link to the full paper. Follow Hummingbird Scientific to stay up to date on the latest in-situ TEM news. #STEM #perovskite #hummingbirdscientific #nanotechnology #materialsscience #catalysis #ORR #amorphization #XRD