Remarkable Piezophoto Coupling Catalysis Behavior of BiOX/BaTiO₃ (X = Cl, Br, Cl_0.166Br_0.834) Piezoelectric Composites

Abstract

Polarization field engineering of piezoelectric materials is considered as an advisable strategy in fine‐tuning photocatalytic performance which has drawn much attention recently. However, the efficient charge separation that determines the photocatalytic reactivities of these materials is quite restricted. Herein, a judicious combination of piezoelectric and photocatalytic performances of BiOX/BaTiO3 (X = Cl, Br, Cl0.166Br0.834) to enable a high piezophotocatalytic activity is demonstrated. Under the synergic advantages of chemical potential difference and piezoelectric potential difference in BiOX/BaTiO3 composites, the photoinduced carriers recombination is largely halted, which directly contributes to the significantly promoted piezophotocatalytic activity of piezoelectric composites. Inspiringly, the BiOBr/BaTiO3 composites under light irradiation with auxiliary ultrasonic activation result in an ultrahigh and stable photocatalytic performance, which is much higher than the total of those by isolated photocatalysis and piezocatalysis, and can rival current excellent photocatalytic system. In fact, the theoretical piezoelectric potential difference of BiOBr/BaTiO3 composites reaches 100 mV, which far exceeds the pure BaTiO3 of 31.21 mV and BiOBr of 30 mV, respectively. First, fabrication of BiOX/BaTiO3 piezoelectric composites and its remarkable piezophoto coupling catalysis behavior lays new ground for developing high‐efficiency piezoelectric photocatalysts in purifying wastewater, killing bacteria, and other piezophototronic processes.

Synergistic Piezo-Photocatalysis of BiOCl/NaNbO3 Heterojunction Piezoelectric Composite for High-Efficient Organic Pollutant Degradation

“…These positive and negative charges will transfer to the opposite directions under the influence of the alternating built-in electric field. In the condition of both light and ultrasound, the electrons and holes located at the conductive band and valance band will transfer to the opposite directions under the internal piezoelectric potential, causing electrons to accumulate in the conductive band of BiOCl and holes accumulate in the valance band of NaNbO 3 [ 32 , 33 , 34 ]. Subsequently, the electrons on the CB of BiOCl combined with the absorbed O 2 to produce ·O 2 − .…”

Photodeposition of CoOx nanoparticles on BiFeO3 nanodisk for efficiently piezocatalytic degradation of rhodamine B by utilizing ultrasonic vibration energy

“…Bai et al reported that the introduction of oxygen vacancy into ZnO can increase the concentration of free electrons and hence enhances the piezocatalytic activity in dyes degradation [20] . Zhou et al loaded BiOX (X = Cl, Br, and Cl 0.166 Br 0.834 ) on BaTiO 3 surface [21] . The formed heterojunction structure extends the lifetime of free charge carriers and hence elevates the piezocatalytic activity of BaTiO 3 .…”

Combination of Piezoelectric and Triboelectric Devices for Robotic Self-Powered Sensors

“…Among them, the BT-based perovskite structure has excellent piezoelectric, ferroelectric, and dielectric properties, and the preparation process is compatible with the traditional lead-based ceramic process. Hence, this has become the most widely investigated structure with the best development potential in recent years [ 52 , 53 ]. Current research mainly considers three aspects for improving the piezoelectric performance of lead-free piezoelectric ceramics.…”