Rational Design of High‐Entropy Materials for Photo and Electrocatalytic Applications

High‐entropy materials (HEMs) are gaining popularity in catalysis due to their adaptable components, specific and versatile structural adjustments, unique electronic properties, presence of active sites, stabilization of entropy, and an exceptional blend of functional properties and structural stability. The advancement of HEMs challenges traditional material design concepts, which previously focused solely on single‐element properties, thereby allowing for improved material properties due to high configurational entropy. These materials have demonstrated immense promise in energy applications, especially in electrocatalytic oxygen evolution reactions (OER), hydrogen evolution reactions (HER), photocatalytic water splitting, and organic waste degradation, which are prerequisites for sustainable energy production. This review explores the fundamental concepts of HEMs, recent advancements in their versatile synthesis routes, and their specific role in the field of catalysis, highlighting their advantages, challenges, and prospects in advancing green energy technologies. It offers exceptional stability and corrosion resistance in OER and HER. Moreover, this review gives insight into recent advancements in high entropy‐based materials for energy conversion and environmental applications, specifically in photocatalysis and electrocatalysis.