Nature CommunicationsDonor-length engineering in directly linked covalent heptazine frameworks for photocatalytic H2O2 ProductionSanqi LiangYufan ZhangMing HouYanyan WangJiwu ZhaoQuan GuZiwei Gao2026-04-18Full textDOI https://doi.org/10.1038/s41467-026-72065-9