Work

Elucidating the reversible exsolution–dissolution behaviour of high-entropy oxides in crystalline and amorphous phases

Year: 2025

Type: article

Abstract: CO diffuse reflectance infrared Fourier transform spectroscopy (CO-DRIFTS), the structural evolution of the two HEO phases under redox conditions was elucidated. Both materials exhibit reversible exsolution of metallic species or alloys in reducing environments, followed by re-incorporation into the host lattice upon oxidation. Remarkably, the a-HEO demonstrates more facile and dynamic self-healing behavior, with alloy exsolution and dissolution occurring under milder conditions because of its enhanced reducibility and structural disorder. This study provides critical insights into the design of next-generation regenerable catalysts based on amorphous HEOs, highlighting the role of phase structure in governing reversible metal-site formation dynamics and catalytic performance.

Source: Faraday Discussions

DOI: 10.1039/d5fd00081e

Authors: Qingju Wang, Hailing Yu, Kevin Siniard, Zhenzhen Yang, Sheng Dai

Institutions: University of Tennessee at Knoxville, Oak Ridge National Laboratory

Language: English

Topic: High Entropy Alloys Studies

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Funders: U.S. Department of Energy, Basic Energy Sciences

OpenAlex ID: W4415146865

FWCI: 1.205

Cites: 55

Cited by: 4

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