The facile oil-phase synthesis of a multi-site synergistic high-entropy alloy to promote the alkaline hydrogen evolution reaction

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High‐entropy alloys (HEAs) have attracted widespread attention in electrocatalysis due to their unique advantages (adjustable composition, complex surface, high tolerance, etc.). They allow for the formation of new and tailorable active sites in multiple elements adjacent to each other, and the interaction can be tailored by rational selection of element configuration and composition. However, it needs to be further explored in catalyst design, the interaction of elements, and the determination of active sites. This review article focuses on the important progress for multi‐sites electrocatalysis in HEAs. The classification is done on the basis of catalytic reaction, including hydrogen evolution reaction, oxygen evolution reaction, oxygen reduction reaction, alcohol oxidation reaction, carbon dioxide reduction reaction, and nitrogen reduction reaction. Based on experiments and theories, a more in‐depth exploration of the high catalytic activity of HEAs will be conducted, including the selection of elements (the special role of each element in catalysis) and the multi‐sites effect. This review can provide the basis for the element selection and design of HEAs in some reactions, to adjust the compositions of HEAs to improve their intrinsic activity. Furthermore, the remaining challenges and future directions for promising research fields are also provided.

Section: Discussionmentioning

confidence: 99%

Section: Multi‐sites Electrocatalysis Of High‐entropy Alloy Electrocatalyst In Hermentioning

confidence: 99%

Section: Multi-sites Electrocatalysis In High-entropy Alloysmentioning

confidence: 99%

Section: Pd-based Heas In Hermentioning

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Section: Multi-sites Electrocatalysis Of High-entropy Alloy Electrocatalyst In Oermentioning

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Multi‐Sites Electrocatalysis in High‐Entropy Alloys

Lai

et al. 2021

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High‐Entropy Catalyst—A Novel Platform for Electrochemical Water Splitting

Zhai

Ren

Wang

et al. 2022

High‐entropy materials (HEMs) have been in the spotlight as emerging catalysts for electrochemical water splitting. In particular, HEM catalysts feature multi‐element active sites and unsaturated coordination as well as entropy stabilization in comparison with their single‐element counterparts. Herein, a comprehensive overview of HEM catalysts used in electrochemical water splitting is provided, covering both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Particularly, the review begins with discussions of the concept and structure of HEMs. In addition, effective strategies for rationally designing HEMs on the basis of computational techniques and experimental aspects is described. Importantly, the importance of computationally aided methods, that is, density functional theory calculations, high‐throughput screening, and machine learning, to the discovery and design of HEMs, is described. Furthermore, the applications of HEMs in the field of water electrolysis are reviewed. Eventually, an outlook regarding the prospects and future opportunities for HEMs is provided.

Multisite Synergism‐Induced Electron Regulation of High‐Entropy Alloy Metallene for Boosting Alkaline Hydrogen Evolution Reaction

Mao

Deng

et al. 2023

Designing the high‐entropy alloys (HEAs) electrocatalysts with controllable nanostructures is of great significance for the development of efficient alkaline hydrogen evolution reaction (HER) electrocatalysts. In this study, an ultrathin HEA‐PdPtRhIrCu metallene with abundant lattice distortions and defects is prepared via a facile one‐step hydrothermal method. The synthesized HEA‐PdPtRhIrCu metallene exhibits superior HER performance in a 1 m KOH solution, where the required overpotential of HEA‐PdPtRhIrCu metallene is only 15 mV to reach a current density of −10 mA cm−2 while possessing a low Tafel slope for 37 mV dec−1. Density functional theory calculations further prove that the synergistic effect of the five elements can optimize the electronic structure to enhance the HER activity of the catalysts. In particular, the strong coupling effect and the strong bonding arising from the interaction between the multi‐metal components can facilitate the electron transfer of the surface and high electroactivity. Moreover, the optimized Pt electronic structure in HEA‐PdPtRhIrCu metallene promotes the optimal PtH binding at the Pt site, thus promoting HER performance.