Engineering of Pore Design and Oxygen Vacancy on High-Entropy Oxides by a Microenvironment Tailoring Strategy

High-entropy oxides (HEOs) exhibit abundant structural diversity due to cationic and anionic sublattices with independence, rendering them superior in catalytic applications compared to monometallic oxides. Nevertheless, the conventional high-temperature calcination approach undermines the porosity...

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Published in:Inorganic chemistry 2024-03, Vol.63 (12), p.5689-5700
Main Authors: Zhang, Bingzhen, Chen, Jian, Li, Ying, Zhu, Yahui, Li, Shengchen, Zhu, Fangyu, Gao, Xiahong, Liao, Sheng, Wang, Shuhua, Xiao, Weiming, Shi, Shunli, Chen, Chao
Format: Article
Language:English
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Summary:High-entropy oxides (HEOs) exhibit abundant structural diversity due to cationic and anionic sublattices with independence, rendering them superior in catalytic applications compared to monometallic oxides. Nevertheless, the conventional high-temperature calcination approach undermines the porosity and reduces the exposure of active sites (such as oxygen vacancies, OVs) in HEOs, leading to diminished catalytic efficiency. Herein, we fabricate a series of HEOs with a large surface area utilizing a microenvironment modulation strategy (m-NiMgCuZnCo: 86 m2/g, m-MnCuCoNiFe: 67 m2/g, and m-FeCrCoNiMn: 54 m2/g). The enhanced porosity in m-NiMgCuZnCo facilitates the presentation of numerous OVs, exhibiting an exceptional catalytic performance. This tactic creates inspiration for designing HEOs with rich porosity and active species with vast potential applications.
ISSN:0020-1669
1520-510X
DOI:10.1021/acs.inorgchem.4c00147