Flower‐Architected Cobalt‐Modified Mo‐MOF@g‐C ₃ N ₄ S‐Scheme Heterojunction: A Synergistic Strategy for Enhanced Solar‐Driven Hydrogen Evolution

ABSTRACT In order to enhance the separation efficiency of charge carriers and thereby increase the rate of photocatalytic hydrogen evolution, a novel heterojunction composite material, Mo/Co‐MOF@g‐C 3 N 4 , was synthesized by loading flower‐like Mo/Co‐MOF onto two‐dimensional ultrathin g‐C 3 N 4 nanosheets through the regulation of the energy band alignment position of the materials. The construction of this heterojunction was designed to modulate the carrier transfer pathway, thereby addressing the poor adsorption capacity and sluggish migration of photogenerated electron–hole pairs in photocatalytic processes. This modification led to a significant enhancement in photocatalytic hydrogen evolution efficiency. Experimental results demonstrated a remarkable hydrogen evolution rate of 2.96 mmol·g − 1 ·h − 1 for the composite material. This performance represents an 8‐fold enhancement compared to the rate of 0.37 mmol·g − 1 ·h − 1 observed for the pristine ultrathin g‐C 3 N 4 . Furthermore, the composite exhibited excellent stability, maintaining its high activity without significant degradation over multiple cyclic testing runs. The Mo/Co‐MOF@g‐C 3 N 4 composite demonstrates both high hydrogen production yield and robust stability in photocatalytic water splitting reactions. This work presents a promising and novel candidate for future research in photocatalysts for hydrogen generation.