Piezocatalysis is an emerging green advanced-oxidation technology for the degradation of toxic pollutants; however, piezomaterials are not generally excellent electrocatalysts. Herein, two complex piezocatalysts (SnO₂/t-BaTiO₃ and SnO₂-Sb/t-BaTiO₃) consisting of an electrocatalyst and piezomaterial, respectively, are designed to investigate the coupled effect of piezocatalytic and electrocatalytic processes on the degradation of pollutants. SnO₂, especially SnO₂-Sb, can considerably enhance the piezocatalytic degradation of the antibiotic metronidazole (MNZ). The piezocatalytic rate constants of SnO₂/t-BaTiO₃ and SnO₂-Sb/t-BaTiO₃ are 2.3 and 3.0 times that of t-BaTiO₃, respectively. In the degradation process, SnO₂ and SnO₂-Sb are confirmed to act as dimensionally stable anode-like (DSA-like) catalysts because they can increase the response of the piezoelectrochemical anodic current and the generation of OH radicals as well as reduce the formation of ¹O₂. Significantly, the piezoelectric field can drive not only the free charges of t-BaTiO₃ and its remnant piezoelectric field but also those of the loaded electrocatalyst SnO₂ to participate in the degradation of MNZ. These results indicate that the coupling of an excellent electrocatalyst and piezomaterial is an effective method to promote piezocatalytic efficiency.

压电催化是一种新兴的绿色先进氧化技术，用于降解有毒污染物。然而，压电材料通常不是优良的电催化剂。在此，设计了两种分别由电催化剂和压电材料组成的复合压电催化剂（SnO ₂ / t -BaTiO ₃和SnO ₂ -Sb / t- BaTiO ₃），以研究压电催化和电催化过程对污染物降解的耦合作用。 。SnO ₂，特别是SnO ₂ -Sb可以大大增强抗生素甲硝唑（MNZ）的压电催化降解。SnO ₂ /的压电催化速率常数吨-BaTiO ₃和SnO ₂ -Sb /吨-BaTiO ₃是2.3和3.0倍的吨-BaTiO ₃分别。在降解过程中，SnO ₂和SnO ₂ -Sb被证实可以用作尺寸稳定的阳极状（DSA状）催化剂，因为它们可以增加压电电化学阳极电流的响应和OH自由基的产生并减少形成¹ O ₂。重要的是，压电场不仅可以驱动t -BaTiO ₃的自由电荷它的残余压电场，以及负载的电催化剂SnO _2的残余压电场都参与MNZ的降解。这些结果表明，优异的电催化剂和压电材料的偶联是提高压电催化效率的有效方法。