Sen et al – High Entropy Oxides: Mapping the Landscape from Fundamentals to Future Vistas – ACS Energy Letters, 2024, 9, 3694–3718

Suvodeep Sen, Manoj Palabathuni, Kevin M. Ryan, and Shalini Singh*

Department of Chemical Sciences and Bernal Institute, University of Limerick, V94 T9PX Limerick, Ireland

Received: April 24, 2024 Revised: June 13, 2024 Accepted: June 25, 2024
Link to paper: https://pubs.acs.org/doi/full/10.1021/acsenergylett.4c01129#

Abstract

High-entropy materials (HEMs) are typically crystalline, phase-pure and configurationally disordered materials that contain at least five elements evenly blended into a solid-solution framework. The discovery of high-entropy alloys (HEAs) and high-entropy oxides (HEOs) disrupted traditional notions in materials science, providing avenues for the exploration of new materials, property optimization, and the pursuit of advanced applications. While there has been significant research on HEAs, the creative breakthroughs in HEOs are still being revealed. This focus review aims at developing a structured framework for expressing the concept of HEM, with special emphasis on the crystal structure and functional properties of HEOs. Insights into the recent synthetic advances, that foster prospective outcomes and their current applications in electrocatalysis, and battery, are comprehensively discussed. Further, it sheds light on the existing constraints in HEOs, highlights the adoption of theoretical and experimental tools to tackle challenges, while delineates potential directions for exploration in energy application.