Research of high entropy alloys as electrocatalyst for oxygen evolution reaction

Abstract

High entropy alloys (HEAs) have been the focus of research as a new class of multi-metal alloys due to their outstanding corrosion resistance, radiation stability, and superior mechanical properties. Unfortunately, there are still limitations in the current research on the characteristics of HEA, which can’t satisfy the wide application of HEAs. Therefore, it is critical to focus the research on the functional aspects of HEAs to achieve their maximum potential. It is exciting that the complex surface chemistry and flexibility of HEAs in shaping unique functions, have been proven to be excellent materials for catalysts in recent years. The superior functionality of HEAs has led to a rapidly growing demand for them. In particular, HEAs as electrocatalysts for oxygen evolution reactions (OER) have become a hot spot for research. However, the applicability of the HEA as catalysts is affected by various factors such as elemental composition, preparation method, surface morphology. The limited research work and unclear catalytic mechanism of HEA electrocatalysts result in the widespread high overpotential, which hinders the application of high entropy electrocatalysts. This paper summarizes the morphological engineering, derived compositional engineering, synthetic methods, electrical properties of the HEA and their derivatives, and applicability as catalysts. Moreover, the paper highlights the challenges and perspectives for the development of high entropy electrocatalysts in order to provide valuable guidance for future research on HEA and its derivatives in the field of OER. • The main preparation method and control strategy of high-entropy catalysts were summarized. • The advantages and disadvantages of high-entropy electrocatalysts and other types of electrocatalysts were introduced. • The opportunities and challenges of high-entropy materials as electrocatalysts in the future were discussed.