Fig. 1: Schematic illustration of Pd reoxidation.

a The competitive processes of Pd0 aggregation and reoxidation in Pd-catalyzed oxidation reactions, the existing strategies toward Pd0 reoxidation suffer from low Pd turnover number, high-pressure O2 atmosphere, organic waste, low atom economy, separation difficulty. b MOFs based Pd/photoredox catalysis for Pd0 reoxidation with high Pd turnover efficiency, atom economy, environmental-friendliness, and recyclability.