Efficient visible light-induced H₂ production by g-C₃N₄/NiFe Prussian blue composites

Hydrogen (H₂) produced via photocatalytic water splitting shows great potential as a renewable alternative to fossil fuels, as it uses clean and renewable resources (water and solar light). However, low efficiency remains a significant challenge for this technology. In this study, we synthesized novel graphitic carbon nitride (GCN)–Prussian blue analog (PBA) heterostructure composites using suitable PBAs for photocatalytic reactions, and explored their application in visible-light-induced H₂ production. GCN-PBA heterostructure composites were synthesized using PBAs containing Ni, Co, and Fe, and their photocatalytic activities under visible light irradiation were compared. The visible-light absorption characteristics and H₂ production efficiency of the GCN-PBA composites were characterized. The GCN-NiFe heterostructure composite showed excellent visible-light-induced H₂ production efficiency, indicating effective charge separation and transfer characteristics that enhanced the photocatalytic activity of GCN. These findings contribute to the development of efficient photocatalytic materials for solar H₂ production, thereby contributing to the advancement of renewable energy technologies.