About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
High-Entropy Materials: Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond VI
|
| Presentation Title |
Tuning the structural and electronic properties of high entropy oxide thin films for water oxidation |
| Author(s) |
Le Wang, Minju Choi, Krishna Prasad Koirala, Mark Bowden, Hsin-Mei Kao, Dongchen Qi, Anton Tadich, Zihua Zhu, Yingge Du |
| On-Site Speaker (Planned) |
Le Wang |
| Abstract Scope |
High-entropy perovskite oxides extend the versatility of conventional ABO3-type perovskite oxides by incorporating multiple equiatomic A-site and/or B-site cations, unlocking new levels of compositional complexity and functional tunability. In this work, we investigate the impact of oxygen vacancies on the structural, electronic, and electrochemical properties of epitaxial La(5B)O3 thin films, where 5B=Cr0.2Mn0.2Fe0.2Co0.2Ni0.2, synthesized by pulsed laser deposition (PLD). By systematically varying the oxygen partial pressure (PO2) during growth, we tune the oxygen vacancy concentration and investigate its influence on lattice structure, charge distribution, and surface oxygen evolution reaction activity. Comprehensive characterizations, including X-ray diffraction, scanning transmission electron microscopy, X-ray absorption spectroscopy, electrochemical measurements, and time-of-flight secondary ion mass spectrometry reveal a strong correlation between defects and water oxidation activity and stability. These findings highlight the potential of high-entropy oxide thin films as a platform for designing highly active and durable catalysts for water oxidation. |