Co3O4@SnO2/graphdiyne type-II heterojunction and p–n heterojunction jointly enhance photocatalytic hydrogen production: Co–O–Sn bond as a bridge for electron transfer

Various characterization methods were used to study the photocatalytic reaction mechanism of Co 3 O 4 @SnO 2 /GDY composite photocatalysts. The interface Co–O–Sn bond acts as a bridge for photogenerated electron transfer, whilst GDY promotes charge transfer and enables efficient H 2 production.