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 BaTiO₃ 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 BaTiO₃ nanoparticles. Furthermore, BaTiO₃ nanosheets display an outstanding H₂ production capability, with the rate of 305 µmol g⁻¹ h^–1, which is almost two times higher than that of BaTiO₃ 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.

中文翻译：

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具有高度暴露 {001} 晶面的 BaTiO3 纳米片增强的压电催化性能

压电催化因其在解决能源短缺和环境污染问题方面的巨大潜力而​​逐渐受到关注。然而，有限的压电催化效率是其实际应用的严重瓶颈。在这里，成功地合成了具有高度暴露的 {001} 极性面的定义明确的 BaTiO _{3纳米片，以提高压电催化活性。}[001]压电极化可以驱动载流子沿面外方向迁移到表面。极性表面为压电催化反应提供了丰富的活性位点。结果，以0.0835 min ^{-1的高一级速率常数}k获得了优异的有机污染物压电催化降解率，比BaTiO ₃纳米粒子高2.7倍。此外，BaTiO ₃纳米片显示出优异的H ₂生产能力，其产氢率为305 µmol g ^-1 h ^{-1 ，几乎是BaTiO} ₃纳米颗粒的两倍。因此，这项工作为设计具有面外极化的高性能压电催化剂提供了一种新颖而全面的策略，也为通过调节压电催化剂的极性面来优化压电催化活性提供了新的见解。