Simiao SHA, Riyue GE, Ying LI, et al. High-entropy catalysts for electrochemical water-electrolysis of hydrogen evolution and oxygen evolution reactions. p265–290
High entropy materials (HEMs) have developed rapidly in the field of electrocatalytic water-electrolysis for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) due to their unique properties induced by many elements in the lattice. They have rich active sites and enhanced entropy stability relative to normal compounds. This paper reviews the preparation strategies and applications of HEM catalysts in electrochemical water-electrolysis to explore the stabilization of HEMs, their catalytic mechanisms, and their application in supporting green hydrogen production. First, the concept and four characteristics of HEMs are introduced based on entropy and composition. Then, synthetic strategies of HEM catalysts are systematically reviewed in terms of the categories of bottom-up and top-down. The application of HEMs as catalysts for electrochemical water-electrolysis in recent years is emphatically discussed, and the mechanisms of improving electrocatalysis performance are expounded by combining theoretical calculation technology and ex-situ/in situ characterization experiments. Finally, the application prospect of HEMs is proposed to conquer the challenges in HEM catalyst fabrications and application.
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