Abstract
Piezoelectric semiconductor nanomaterials have been intensively developed for piezo-photocatalysis, in which the built-in electric field generated by piezoelectricity can accelerate the seperation and transfer of photogenerated carriers. However, the challenges of poor recyclability and secondary pollution must be solved for large-scale applications. In this study, a three-dimensional porous poly(vinylidene difluoride) (PVDF) composite foam containing piezoelectric semiconductor Bi0.5Na0.5TiO3 (BNT) nanofibers are fabricated. The BNT nanofibers prepared by electrospinning exhibit excellent piezoelectric activity, strong photoexcited response, and low charge transfer resistance. The fabricated BNT/PVDF composite foams display favorable flexibility and hierarchical pore structure, which can easily deform to construct a built-in electric field via bi-piezoelectric integration and owns abundant active sites for catalytic reactions. The PVDF matrix has a dominant electroactive β-phase, responsible for its high piezoelectricity. As a result, the BNT/PVDF composite foam exhibits strong piezo-photocatalytic activity. The degradation of highly-concentrated RhB solution (C0 = 50 mg/L) reaches 90.8% within 180 min. This work provides a feasible piezo-photocatalytic material for large-scale applications.
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