Bi4Ti3O12 (BiT) films were fabricated using a facile hydrothermal method on seed-layer coated FTO substrates and their PEC, photocatalytic, and piezo-related properties were investigated. The BiT hydrothermal films showed high aspect-ratio nanosheets, which allowed superior photocatalytic properties compared with the BiT seed layer fabricated using a sol-gel method. The BiT-H-14 sample exhibited the best photodegradation (k of approximately 0.011/min-1) and piezophotodegradation among all samples. The PEC performance also indicated the enhanced photocurrent density (Jph) and ABPE values for the hydrothermal samples under both illumination and ultrasonication. Our results indicated that the BiT-H-14 sample possessed the highest surface areas and lowest band-to-band recombination. Furthermore, the photocatalytic properties were well explained by the deduced energy band diagram. Meanwhile, minor piezotronic and piezophototronic effects were observed for the BiT-H-14 sample, which was attributable to the poor inducement of piezopotential because of the random distribution of BiT nanosheets.

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