Challenges and Strategies for Synthesizing High Performance Micro and Nanoscale High Entropy Oxide Materials

Abstract

High‐entropy oxide micro/nano materials (HEO MNMs) have shown broad application prospects and have become hot materials in recent years. This review comprehensively provides an overview of the latest developments and covers key aspects of HEO MNMs, by discussing design principles, computer‐aided structural design, synthesis challenges and strategies, as well as application areas. The analysis of the synthesis process includes the role of high‐throughput process in large‐scale synthesis of HEOs MNMs, along with the effects of temperature elevation and undercooling on the formation of HEO MNMs. Additionally, the article summarizes the application of high‐precision and in situ characterization devices in the field of HEO MNMs, offering robust support for related research. Finally, a brief introduction to the main applications of HEO MNMs is provided, emphasizing their key performances. This review offers valuable guidance for future research on HEO MNMs, outlining critical issues and challenges in the current field.

Mapping current high-entropy materials for water electrolysis: from noble metal to transition metal

“…Current research efforts have confirmed that these HEMs with unique physical and chemical properties can serve as novel platforms for electrocatalytic water splitting, expanding from seminal high-entropy alloys to state-of-the-art high-entropy oxides, (oxy)hydroxides, sulfides, phosphides, halides, and metal–organic frameworks (MOFs). 45,46 To date, a few reviews have been presented to summarize the emerging high-entropy nanomaterials with application in electrocatalysis and even electrochemical energy storage. Some reviews have summarized the progress on different applied reactions, such as HER, OER, ORR, CO 2 RR and alcohol oxidation.…”

High Entropy Oxides: Mapping the Landscape from Fundamentals to Future Vistas

“…This prevailing influence arises from the typically restricted miscibility of elements . High-entropy alloys (HEAs) are an unorthodox class of emerging materials that have thrived during the current decade. , They mostly contain five or more principal elements with nearly equimolar compositions, that utilize a high configurational entropy to stabilize multiple elements within a single crystal lattice or sublattice. , The multielemental composition and homogeneously mixed solid-solution (SS) state in high-entropy materials (HEMs) not only offer an extensive array of material combinations for discovery but also present a distinctive microstructure for optimizing properties. − The first reports on multicomponent and crystalline HEAs were published in 2004, by Yeh and Cantor. , They proposed that higher-order alloys can be achieved by increasing the configurational entropy of mixing beyond the enthalpy associated with compound formation. However, these seminal reports did not furnish a detailed structural understanding, nor did they unveiled any general synthetic pathway for various compositions.…”