Spontaneous Phase-Transformed Interface to Boost Tandem Reoxidation for CO2 Reduction and OTC Degradation via Synergistic Photothermal Effect

The robust S-scheme p–n junction between Cu 2 O and Cu-TCPP has been designed by controllable in situ topological reduction. This coshared Cu atom spontaneously transformed interface with abundant oxygen vacancies exhibited a wide light absorption range and a strong internal building electric field. The introduction of the photothermal effect accelerated the reaction kinetics to extract electrons further effectively for photocatalytic interaction, which was confirmed by the tandem CO 2 reduction and OTC degradation experiments. Cu 2 O-10R stands out with an impressive CO production rate of 103.7 μmol g –1 h –1 and a high selectivity of 95.4%, 1.77 times and 1.12-fold that of the single half-reduction. DFT and the experiment have verified the real active sites: Cu-TCPP as electron accumulations in the reduction side and the induced Cu 2 O as a hole resoluble pool in the oxidation side. Hence, this in situ-derived p–n junction not only modulates to expedite the carrier’s migration dynamics but also boosts the separation efficiency to achieve superior reoxidation activity.