High-entropy alloys for solid hydrogen storage: a review

The development of materials has coincided with the development of human civilization. In recent years, high-entropy alloys (HEAs) have been extensively applied to structural and functional materials owing to their unique physical and chemical properties. Therefore, HEAs have emerged as a promising materials. This review summarizes recent research progress on HEAs for hydrogen storage. First, the history and basic concepts of HEAs are systematically introduced. Furthermore, recent developments in the field of HEA-based hydrogen storage are reviewed and discussed. The preparation process, design methods, microstructures, and hydrogen-storage performance of HEAs are systematically compared and summarized. Other hydrogen-related applications are also presented. Finally, the shortcomings of the HEAs currently used in hydrogen-storage applications are highlighted, and future development directions are outlined.