Construction of Full-Spectrum-Response BiOBr:Er@BiO S-Scheme Heterojunction With [Bi─O] Tetrahedral Sharing by Integrated Upconversion and Photothermal Effect Toward Optimized Photocatalytic Performance.

Designing and optimizing photocatalysts to maximize the use of sunlight and achieve fast charge transport remains a goal of photocatalysis technology. Herein, a full-spectrum-response BiOBr:Er@BiO core-shell S-scheme heterojunction is designed with [Bi─O] tetrahedral sharing using upconversion (UC) functionality, photothermal effects, and interfacial engineering. The UC function of Er and plasmon resonance effect of BiO greatly improves the utilization of sunlight. The equivalent layer structure of BiOBr and BiO facilitates the construction of high-quality S-scheme heterojunction interfaces with close atomic-level contact obtained from the [Bi─O] tetrahedral sharing and the resulting BiOBr:Er@BiO core-shell morphology, enabled efficient charge transfer. Furthermore, localized temperature increase, induced by photothermal effects, enhanced the chemical reaction kinetics. Benefiting from the distinctive construction, the BiOBr:Er@BiO heterojunctions exhibit excellent performance in the photocatalytic degradation of bisphenol A that is 2.40 times and 4.98 times greater than that of BiOBr:Er alone under full-spectrum light irradiation and near-infrared light irradiation, respectively. This work offers an innovative perspective for the design and fabrication of full-spectrum-response S-scheme heterojunction photocatalysts with efficient solar energy utilization based on high quality interfaces, UC functionality, and the photothermal effect.