Enhanced Piezocatalytic Performance of BaTiO₃ Nanosheets with Highly Exposed {001} Facets

Abstract

Piezocatalysis has gradually come into the limelight due to its great potential for solving energy shortages and environmental pollution problems. However, limited piezocatalytic efficiency is a severe bottleneck for its practical applications. Here, well-defined BaTiO 3 nanosheets with highly exposed {001} polar facets are successfully synthesized to enhance the piezocatalytic activity. The [001] piezoelectric polarization can drive the carriers to migrate to the surface along the out-of-plane direction. The polar surface provides abundant active sites for the piezocatalytic reaction. As a result, a superior piezocatalytic degradation ratio of organic pollutants is obtained with a high first-order rate constant k of 0.0835 min −1 , which is 2.7 times higher than the BaTiO 3 nanoparticles. Furthermore, BaTiO 3 nanosheets display an outstanding H 2 production capability, with the rate of 305 µmol g −1 h -1 , which is almost two times higher than that of BaTiO 3 nanoparticles. This work thus provides a novel and comprehensive strategy for designing high-performance piezocatalysts with an out-of-plane polarization, and also provides novel insights for the optimization of the piezocatalytic activity by regulating the polar facet of piezocatalysts.

Piezoelectric Nanoparticles for Ultrasound-Based Wireless Therapies

“…For example, Ag deposition on BaTiO 3 or deposition of Au on a calcium phosphate nanowire enhances the piezocatalytic degradation of organics. , Fifth, the use of a 2D nanosheet with polar facets enhances the piezocatalytic performance. For example, BaTiO 3 nanosheets with highly exposed {001} polar facets exhibit enhanced piezocatalytic activity . The {001} polar facet can drive the carriers to migrate to the surface along the out-of-plane direction.…”

“…For example, BaTiO 3 nanosheets with highly exposed {001} polar facets exhibit enhanced piezocatalytic activity. 38 The {001} polar facet can drive the carriers to migrate to the surface along the out-of-plane direction. This polar surface provides abundant active sites for the piezocatalytic reaction.…”

A novel NiO/BaTiO3 heterojunction for piezocatalytic water purification under ultrasonic vibration

“…Tang et al synthesized the BaTiO 3 nanosheets with highly exposed polar facets to enhance the piezocatalytic activity. Thanks to the obvious piezoelectric polarization of polar facets, the BaTiO 3 nanosheets displayed more outstanding piezocatalytic performance for pollutant degradation and H 2 production compared with BaTiO 3 nanoparticles [24] . The above researchers improved the piezoelectric catalytic performance of BaTiO 3 by regulating the morphology, but BaTiO 3 still exists the disadvantage of fast carrier recombination, which limits the further improvement of its performance.…”

Enhancing visible-light photocatalytic performance of Au/TiO2catalysts through light reflection-promoted optical absorption with oriented anatase mesocrystals

“…Mesocrystals are highly ordered superstructures with a high degree of crystallinity and oriented subunit alignment. 20 For comparison, less transparent films were studied that consisted of aggregated small anatase polycrystals arranged without a preferred orientation (see Scheme 1b). The visible light photocatalytic performance of the three catalysts was evaluated for two model reactions, methanethiol (CH 3 SH) removal by catalytic oxidation and H 2 evolution by reducing water, which are two redox reactions.…”