Distinct oxygen reduction pathways for solar H₂O₂ production by regulating unsaturated bonds in covalent organic frameworks.

ABSTRACT: Photocatalytic H₂O₂ generation via the two-electron oxygen reduction reaction (2e^- ORR) is a highly sustainable approach, capable of proceeding via either a one-step or two-step 2e^- ORR route. Nonetheless, precise regulation of the 2e^- ORR pathways still remains a formidable challenge. Herein, for the first time, we modulate the 2e^- ORR pathway through unsaturated bond control in covalent organic frameworks (COFs). We synthesize a pair of isostructural COFs distinguished only by their unsaturated bonds. The alkyne-containing TY-COF favors the two-step 2e^- ORR route, whereas the alkene-containing TE-COF follows the one-step 2e^- ORR route. Without any sacrificial agents in O₂, the

SUBMITTER: Yue JY 

PROVIDER: S-EPMC12231586 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature