C14-Laves phase high entropy alloys for hydrogen storage: a review
(2026)
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- Abstract
- Recently, solid-state hydrogen storage materials have attracted significant research attention within the hydrogen energy community owing to their higher hydrogen storage density and affordable safety compared to conventional systems (i.e., gaseous and liquid storage systems). Among these materials, high entropy alloys (HEAs) possessing C14-Laves single-phase structures have emerged as promising candidates for this application, attributed to their unique structural properties and superior performance. Unlike traditional alloys, the complex composition and high configurational entropy of C14-Laves phase HEAs reveal a new balanced design strategy for hydrogen storage that stabilizes single phase structures, encourages reversible hydrides, and provides exceptional cycling stability. Numerous remarkable studies have already demonstrated the potential of C14-Laves phase alloys, typically for stationary hydrogen storage applications. In this review, first, the definition and concept of HEAs as well as the evaluation of the compositional design strategies for the formation of a favorable C14-Laves single solid-solution phase are highlighted. Moreover, the thermodynamic modeling of the hydrogenation properties, manufacturing processes, and hydrogen storage properties in the latest state-of-the-art C14-Laves phase structured HEAs are presented and discussed. Finally, possible applications, potential challenges, and perspectives are outlined. Wider impact Hydrogen is a key vector toward a reliable and sustainable energy supply. However, hydrogen storage is one of the most challenging aspects in hydrogen technology. Metal hydride-based solid-state hydrogen storage has gained considerable attention owing to its higher volumetric densities and safety compared to traditional gaseous and liquid storage systems. Yet, most reported metal hydrides remain far from commercialization, mainly due to limited hydrogen storage capacity or lack of reversibility under practical conditions. In this context, high entropy alloys (HEAs) have emerged as a novel class of alloys with great potential for hydrogen storage. Among the different HEA compositions, those featuring a single C14-Laves phase have shown excellent hydrogen-related properties, such as room temperature reversibility, rapid kinetics, easy activation, and good cyclability as demonstrated by several studies supporting their future in hydrogen storage applications. Furthermore, a key advantage of HEAs is their vast compositional formulations, offering numerous possibilities to fine tune the desired microstructures and, hence, properties of hydrides. Therefore, achieving optimal hydrogen performance will largely depend on effective design strategies to predict the formation of the C14-Laves phase and appropriate processing methods. This review focuses on recent progress on C14-Laves phase HEAs for hydrogen storage, highlighting all the previous aspects.
- Affiliations
UM6P High Throughput Multidisciplinary Research Laboratory (HTMR), College of Chemical Sciences and Engineering (CCSE)
Citations
El Aalami, B., Idrissi, H., & Trabadelo, V. (2026). C14-Laves phase high entropy alloys for hydrogen storage: a review. https://doi.org/10.1039/d5mh01719j