About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Chemistry and Physics of Interfaces
|
| Presentation Title |
From grain boundary structure to functional surface states |
| Author(s) |
Christian Liebscher, Mahyar Mosavari, Patrick Marx, Alfred Ludwig, Dylan Jennings |
| On-Site Speaker (Planned) |
Christian Liebscher |
| Abstract Scope |
Grain boundary engineering in catalysis has emerged as a promising strategy to tailor catalytic activity and selectivity. However, the underlying relationships between grain boundary atomic structure, interface phase transformations, and catalytic performance remain largely unexplored.
Here, we demonstrate how grain boundaries in metallic systems influence catalytic properties in Au nanoassemblies. By systematically increasing the density of coincidence site lattice grain boundaries, both the catalytic activity and the selectivity towards the two-electron oxygen reduction reaction are enhanced.
We then turn to Co3O4 thin films and reveal the atomic-scale nature of emergent states where grain boundaries terminate at the surface. Atomic-resolution imaging and spectroscopy uncovers the complex structure and oxidation state of symmetric and asymmetric grain boundary segments within the spinel structure. Finally, we demonstrate the formation of spatially confined CoO exclusively at grain boundary surface terminations and discuss its potential role on catalytic properties. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Thin Films and Interfaces, Other |