Recent Advances in Poly‐Heptazine Imide and Based Materials for Photocatalytic Hydrogen Evolution

Abstract This review presents an overview of recent developments and advancements in the field of photocatalytic hydrogen evolution using poly(heptazine imide) (PHI) and based materials. Photocatalytic hydrogen evolution (PHE) has received great amount of attention because of its potential as a clean and sustainable energy source and PHI based materials have emerged as promising candidates for this purpose due to their distinct structural properties, improved light absorption, charge separation and reduced recombination. This review discusses the essential concepts of PHE and the potential of poly(heptazine imide) materials and their derivatives as photocatalysts and also the limitations of these materials in photocatalytic activity. It addresses the synthetic routes and strategies adopted to enhance the photocatalytic activity of these materials including surface modifications, band engineering, doping, loading co‐catalysts and composites & heterojunction construction. Furthermore, the recent works in photocatalytic H 2 evolution using PHI and based materials have been summarized and discussed. Additionally, we examined the challenges and future outlooks in this field, emphasizing the need for scalable and cost‐effective production methods.