Revealing High-Temperature Reduction Dynamics of High-Entropy Alloy Nanoparticles via In Situ Transmission Electron Microscopy

Song, Boao; Yang, Yong; Yang, Timothy T.; He, Kun; Hu, Xiaobing; Yuan, Yifei; Dravid, Vinayak P.; Zachariah, Michael R.; Saidi, Wissam A.; Liu, Yuzi; Shahbazian-Yassar, Reza

doi:10.1021/acs.nanolett.0c04572

Title: Revealing High-Temperature Reduction Dynamics of High-Entropy Alloy Nanoparticles via In Situ Transmission Electron Microscopy

Journal Article · Thu Feb 11 00:00:00 EST 2021 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.0c04572· OSTI ID:1777239

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Univ. of Chicago, IL (United States). Dept. of of Mechanical and Industrial Engineering
Univ. of Maryland, College Park, MD (United States). Dept. of Chemical and Biomolecular Engineering; Univ. of California, Riverside, CA (United States). Dept. of Chemical Engineering and Materials Science
Univ. of Pittsburgh, PA (United States). Dept. of Mechanical Engineering and Materials Science
Northwestern Univ., Evanston, IL (United States). Northwestern University Atomic and Nanoscale Characterization Experimental (NUANCE) Center, Dept. of Materials Science and Engineering, International Institute for Nanotechnology (IIN)
Univ. of California, Riverside, CA (United States). Dept. of Chemical Engineering and Materials Science
Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States

Understanding the behavior of high-entropy alloy (HEA) materials under hydrogen (H₂) environment is of utmost importance for their promising applications in structural materials, catalysis, and energy-related reactions. Herein, the reduction behavior of oxidized FeCoNiCuPt HEA nanoparticles (NPs) in atmospheric pressure H-2 environment was investigated by in situ gas-cell transmission electron microscopy (TEM). The reduction reaction front was maintained at the external surface of the oxide. During reduction, the oxide layer expanded and transformed into porous structures where oxidized Cu was fully reduced to Cu NPs while Fe, Co, and Ni remained in the oxidized form. In situ chemical analysis showed that the expansion of the oxide layer resulted from the outward diffusion flux of all transition metals (Fe, Co, Ni, Cu). Revealing the H-2 reduction behavior of HEA NPs facilitates the development of advanced multicomponent alloys for applications targeting H₂ formation and storage, catalytic hydrogenation, and corrosion removal.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Science Foundation (NSF); W.M. Keck Foundation; State of Illinois

Grant/Contract Number:: AC02-06CH11357; DMR-1809439; DMR-1809085

OSTI ID:: 1777239

Journal Information:: Nano Letters, Vol. 21, Issue 4; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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