Unveiling P‐Doped g‐C₃N₄/ZIF67 Heterostructure Nanocomposite for Solar‐Driven Green Hydrogen Production

Herein, a heterostructure of P‐doped g‐C 3 N 4 combined with varying amounts of cobalt‐based metal–organic framework ZIF67 has been designed to enhance water‐splitting green hydrogen production. Innovation of the work lies in the dual incorporation of nonmetal phosphorous and ZIF67 into g‐C 3 N 4 to design a novel heterostructure with an improved light absorption, charge separation, and active surface area, which results in an enhanced photocatalytic efficiency under comparatively lower intensity visible light and natural sunlight irradiation. A series of characterizations are performed, and the results show the well‐dispersed ZIF67 polyhedrons on the P‐doped g‐C 3 N 4 lamellar bulk structure, with an increased active surface area and better charge separation efficacy. The optimized composite with a bandgap of 2.2 eV shows enhanced light harvesting capacity with a maximum H 2 evolution rate of 2249.54 μmol g −1 in 4 h under 100 W visible light using 1.0 g L −1 catalyst concentration, which is nearly 5 times the rate achieved with pristine g‐C 3 N 4 . The engineered material also reveals good recyclability with a hydrogen generation rate of 1502.7 μmol g −1 after four consecutive cycles, henceforth reflecting good stability. This research offers a new perspective and foundation for designing highly stable, energy‐efficient composite photocatalysts for green hydrogen production.