The built-in electric field induced by piezoelectric materials has been proven to be one of the most effect-ive strategies for regulating charge transfer pathways and suppressing carrier recombination.PbTi0.85Ni0.15O3/TiO2 nanorod arrays compsite were fabricated via a two-step process comprising hydrothermal and sol-gel methods.By degrading organic dyes,composite materials exhibit excellent piezo-photocatalytic performance.After 30 minutes,the piezo-photocatalytic degradation rate of methylene blue(MB)by PbTi0.85Ni0.15O3/TiO2 reached 97.3％,with a degradation reaction rate of 0.1215 min-1,which is 3.3 times of the photocatalytic degradation rate(0.0372 min-1)and 5.7 times of the piezoelectric catalytic degradation rate(0.0211 min-1).After doping Ni,the band gap decreases,the carrier concentration increases,the lattice distortion increases,and the piezo-photocatalytic performance enhances.The results of sacrificial agent addition experiments and electron spin resonance spectroscopy(ESR)experi-ments indicate that·O2-and·OH are the main active spices in piezo-photocatalytic degradation.After doping Ni,the band gap decreases,the carrier concentration increases,and the lattice distortion increases,resulting in superior piezo-photocatalytic performance of PbTi0.85Ni0.15O3/TiO2 compared to PbTiO3/TiO2.In addition,the degradation of different dyes by PbTi0.85Ni0.15O3/TiO2 and the degradation rate after 5 cycles indicate that the composite material has good piezo-photocatalytic degradation property for various dyes and good stability.According to the energy band arrangement,it is proposed that the tilting and bending of the energy band caused by piezoelectric polariza-tion can promote the separation of photogenerated carriers,so that dye degradation has excellent piezoelectric photocatalytic performance.
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