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

Boao Song | Zendy; Yong Yang | Zendy; Timothy T. Yang | Zendy; Kun He | Zendy; Xiaobing Hu | Zendy; Yifei Yuan | Zendy; Vinayak P. Dravid | Zendy; Michael R. Zachariah | Zendy; Wissam A. Saidi | Zendy; Yuzi Liu | Zendy; Reza ShahbazianYassar | Zendy

Open Access

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

Author(s) -

Boao Song,

Yong Yang,

Timothy T. Yang,

Kun He,

Xiaobing Hu,

Yifei Yuan,

Vinayak P. Dravid,

Michael R. Zachariah,

Wissam A. Saidi,

Yuzi Liu,

Reza ShahbazianYassar

Publication year - 2021

Publication title -

nano letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 4.853

H-Index - 488

eISSN - 1530-6992

pISSN - 1530-6984

DOI - 10.1021/acs.nanolett.0c04572

Subject(s) - transmission electron microscopy , alloy , materials science , oxide , chemical engineering , catalysis , nanoparticle , high entropy alloys , hydrogen , hydrogen storage , transition metal , in situ , corrosion , nanotechnology , metallurgy , chemistry , biochemistry , organic chemistry , engineering

Understanding the behavior of high-entropy alloy (HEA) materials under hydrogen (H 2 ) 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 H 2 formation and storage, catalytic hydrogenation, and corrosion removal.

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