Scientific Achievement
High-entropy alloy (HEA) nanoparticles (FeCoNiCuPt) show significantly slower oxidation kinetics compared to monometallic and bimetallic nanoparticles due to the formation of a disordered oxide.
Significance and Impact
This study contributes understanding toward the design of stable metal catalysts and demonstrates the advantages of using an in situ TEM gas cell for nanodynamics studies.
Research Details
- During oxidation, co-segregation of metals form a disordered oxide layer that can slow oxidation kinetics compared to monometallic and bimetallic systems. Localized ordering is identified in the oxide layer that originate from Fe2O3, CoO, NiO and CuO crystallites.
- The JEOL-JEM 2100 electron microscope and Hummingbird in situ gas-cell TEM holder was utilized at the Center for Nanoscale Materials (CNM).
Work was performed in part at CNM.
About Argonne’s Center for Nanoscale Materials
The Center for Nanoscale Materials is one of the five DOE Nanoscale Science Research Centers, premier national user facilities for interdisciplinary research at the nanoscale supported by the DOE Office of Science. Together the NSRCs comprise a suite of complementary facilities that provide researchers with state-of-the-art capabilities to fabricate, process, characterize and model nanoscale materials, and constitute the largest infrastructure investment of the National Nanotechnology Initiative. The NSRCs are located at DOE’s Argonne, Brookhaven, Lawrence Berkeley, Oak Ridge, Sandia and Los Alamos National Laboratories. For more information about the DOE NSRCs, please visit https://science.osti.gov/User-Facilities/User-Facilities-at-a-Glance.
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