Unveiling the synergistic role of frustrated Lewis pairs in crystalline carbon nitride toward enhanced photocatalytic H2O2 production.

Synergistic hydrothermal/molten-salt treatment yields B-doped crystalline carbon nitride nanosheets with FLPs (B/cyano-N), N-vacancies, cyano groups, and K+ intercalation, whose push-pull effect boosts O2 adsorption and lowers *OOH barrier for selective 2e- ORR, delivering a high H2O2 production rate and stability.