Dual strategies for enhancing piezoelectric catalytic ability of energy storage BiOBr@Bi4O5Br2 heterojunction: interfacial electric field and intrinsic polarization electric field

An energy storage BiOBr@Bi4O5Br2 heterojunction piezoelectric catalyst was prepared by homogeneous nucleation hydrothermal crystallization. The interfacial electric field enhances the polarization electric field and the piezoelectric effect of the heterojunction, the stored electron and hole concentrations are 94.23 and 86.17 μmol·g-1, respectively, and d33 is increased to 6.29nm·V-1. In the dark for 50min, the degradation rates of tetracycline, ciprofloxacin and bisphenol A caused by energy storage and positive piezoelectric effect are 63.44%, 75.95% and 73.90%, respectively, and it has good dark cycle stability and dark repair. Under the visible and near infrared light, the double localized surface plasmon resonance effects of heterojunction electron-hole storage and the enhanced series polarized electric field accelerate the migration rate of stored electrons and holes. This work provides a new idea of the preparation of around the clock energy storage piezoelectric catalytic materials from traditional energy storage bismuth-based nanomaterials with the intrinsic polarization electric field.