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Research Highlight | Argonne National Laboratory

High-entropy alloy nanoparticles show unique reduction behaviors

In a study published in Nano Letters, researchers uncover reduction behavior of oxidized high-entropy alloy nanoparticles in hydrogen.

Scientific Achievement

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. 

Research Details

  • 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.


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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://​sci​ence​.osti​.gov/​U​s​e​r​-​F​a​c​i​l​i​t​i​e​s​/​U​s​e​r​-​F​a​c​i​l​i​t​i​e​s​-​a​t​-​a​-​G​lance.

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