“In the field of photocatalytic hydrogen evolution reactions, researchers have made significant progress. By employing high-energy ionizing radiation, they precisely regulated defect formation in boron nitride nanosheets at ambient conditions, enhancing photocatalytic hydrogen production efficiency. This work provides a novel approach for BNNS application in visible-light photocatalysis and demonstrates the unique role of radiation technology in quantitatively regulating defects and improving catalytic activity.”