Piezophototronic effect in enhancing charge carrier separation and transfer in ZnO/BaTiO3 heterostructures for high-efficiency catalytic oxidation

Advances in Piezo‐Phototronic Effect Enhanced Photocatalysis and Photoelectrocatalysis

“…[ 112 ] The cooperation of BaTiO 3 with other semiconductors such as ZnO/BaTiO 3 heterostructure has also been demonstrated to work well in the degradation of pollutants, which endows a suitable bend alignment formed at the interface to promote charge transfer behavior. [ 114 ]…”

Reactive Oxygenated Species Generated on Iodide‐Doped BiVO4/BaTiO3 Heterostructures with Ag/Cu Nanoparticles by Coupled Piezophototronic Effect and Plasmonic Excitation

“…[ 21 ] By tuning the composition and the structure of piezoelectric materials, and properties of the electrolytes, it is possible to tune the extent of the polarization‐induced depolarization field, and in turn, the production and composition of the ROS being formed. Common piezoelectric semiconductors such as MoS 2 , [ 22 ] BaTiO 3 , [ 23 ] and BiFeO 3 [ 24 ] have been shown to produce ROS under a mechanical strain stimulus, and the ROS have been used for tentative applications in wastewater treatment [ 25 ] and tumor therapy. [ 3a ] In general, mechanically‐induced redox catalysis has been studied, called as mechanoredox catalysis or piezocatalysis, using piezoelectric materials for organic synthesis, [ 26 ] sonotherapy, [ 3c ] and water splitting.…”

“…In earlier studies, we have revealed that the piezoelectric heterostructures such as BaTiO 3 /ZnO and BiO X /BaTiO 3 ( X = Cl, Br) possess higher catalytic reactivity for the production of ROS than their individual subcomponents, and we related these higher rates to an enhanced piezoelectric polarization potential due to the occurrence of gradients of the electrochemical potentials at the interfaces of the heterostructures. [ 25 ] However, there is still a significant room to explore the coupling between the piezoelectricity, the production of ROS, and other physicochemical effects and to design and attain high‐performance piezoelectric semiconductors for the synthesis of H 2 O 2 . Notably, some catalytic systems have been used and been studied for the ROS production by coupling of ferroelectricity and piezophototronic effect.…”

Photocatalysis Enhanced by External Fields

“…For instance,t he theoretically calculated surface potential difference of BiOBr/BaTiO 3 reached 100 mV with ac avitation pressure of 10 8 Pa, which far exceeded that of BaTiO 3 (31.21 mV) and BiOBr (30 mV), respectively.T he high piezoelectric potential drives the charge carriers to separate efficiently,r esulting in high catalytic activity under light irradiation with auxiliary ultrasonic vibration. [35] Through the combination of two typical piezoelectrics,am aximal piezoelectric potential difference of 414.40 mV was achieved for ZnO/BaTiO 3 ,w hich is much higher than that of BaTiO 3 and ZnO individually under the same external pressure.T he enhanced macroscopic polarization led to efficient charge separation and sufficient mechanochemical potential to promote the catalytic reactions.A sar esult, ZnO/BaTiO 3 exhibited prominent rhodamine B( RhB) degradation performance under both ultrasonic and light irradiation, with the degradation efficiencyreaching 97 %within 30 min. [35b] In heterojunctions,t he space charge region and energy barrier at the interface can be effectively modulated by ultrasound-induced surface band bending, which further improves the photocatalytic performance through the synergism of the interfacial potential difference and piezoelectric potential difference.F or instance,t he piezo-enhanced plasmonic photodegradation of MO was realized on aA u/BaTiO 3 Schottky junction.…”