Imaging the reaction front of oxidized FeCoNiCuPt high-entropy alloy (HEA) nanoparticles in reducing conditions showed reduction occurs primarily at the external HEA surfaces; only Cu was fully reduced to Cu nanoparticles while Fe, Co and Ni remained in their oxidized forms.
Significance and Impact
The reduction behavior of oxidized FeCoNiCuPt HEA nanoparticles in hydrogen was elucidated with in situ gas-cell transmission electron microscopy (TEM). Such information assists in the design of more reliable catalysts and is applicable to corrosion studies.
- In situ chemical analysis monitored the diffusion of Fe, Co, Ni and Cu. An expanded porous structure was observed.
- The JEOL-JEM 2100F TEM and Hummingbird in situ gas-cell holder at the Center for Nanoscale Materials (CNM) were utilized.
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.
Argonne National Laboratory seeks solutions to pressing national problems in science and technology. The nation’s first national laboratory, Argonne conducts leading-edge basic and applied scientific research in virtually every scientific discipline. Argonne researchers work closely with researchers from hundreds of companies, universities, and federal, state and municipal agencies to help them solve their specific problems, advance America’s scientific leadership and prepare the nation for a better future. With employees from more than 60 nations, Argonne is managed by UChicago Argonne, LLC for the U.S. Department of Energy’s Office of Science.
The U.S. Department of Energy’s Office of Science is the single largest supporter of basic research in the physical sciences in the United States and is working to address some of the most pressing challenges of our time. For more information, visit https://energy.gov/science.