sciencedirect: High entropy oxides-exploring a paradigm of promising catalysts: A review

 

Materials & Design

Volume 202, April 2021, 109534

High entropy oxides-exploring a paradigm of promising catalysts: A review

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^a

Mechanical Engineering Department, Khalifa University of Science and Technology, Abu Dhabi 127788, UAE

^b

Center for Catalysis and Separations, Khalifa University of Science and Technology, Abu Dhabi 127788, UAE

^c

Department of Mechanical Engineering, University of Thessaly, Greece

Received 2 October 2020, Revised 17 January 2021, Accepted 25 January 2021, Available online 29 January 2021, Version of Record 14 February 2021.

 

 

Abstract

This review presents the structural elements and discusses the great potential of high entropy oxides (HEO) as promising catalysts. A critical comparison is provided with the medium and low entropy metal oxides in terms of the important functionality of HEO to exhibit higher oxygen mobility and withhold high population of oxygen vacancies as well as leading to high metal dispersion. This review study critically compares the performance of the thermal, electro- and photo- high entropy oxides catalysts with the conventional metal oxides and demonstrates their superiority over them while discussing the governing characteristics of HEO. The HEO complex structure is highlighted using ab initio calculations on understanding and tuning their electronic/structural properties. Catalysts’ design criteria and direction in the studies of the HEO as catalysts for energy and sustainability are proposed.

 https://www.sciencedirect.com/science/article/pii/S0264127521000873