The built-in electric field of piezoelectric material is a widely considered reason for improved photocatalytic performance. In this paper, BaTiO₃@TiO₂ microflowers are demonstrated ultrahigh piezo-photo catalytic ability, of which the rate constant reaches 0.274 min⁻¹ for 10 mg/L rhodamine B degradation. The degradation rate is almost 0 in dark, but reaches 0.084 min⁻¹ under light irradiation. After deducting the difference in specific surface area, the rate constant of BaTiO₃@TiO₂ is 0.128 min⁻¹ m⁻², which is 10 times higher than that of pure TiO₂ (0.012 min⁻¹ m⁻²). These results indicate that the interface between BaTiO₃ and TiO₂ plays a major role to facilitate the separation of carriers, and it is also the uniqueness of this work. The mechanism of the interfacial enhanced piezo-phototronic effect is demonstrated by combining DFT modeling calculation and COMSOL simulation. This work proves that interface engineering is an effective route to enhance the performance of piezo-photoelectric catalysis.

压电材料的内建电场是提高光催化性能的一个广泛考虑的原因。在本文中，BaTiO ₃ @TiO ₂微花表现出超高的压电光催化能力，其速率常数达到 0.274 min ^-1降解 10 mg/L 罗丹明 B。在黑暗中降解率几乎为0，但在光照下达到0.084 min ^{-1 。}扣除比表面积的差异后，BaTiO ₃ @TiO ₂的速率常数为0.128 min ^-1 m ^-2，比纯TiO ₂的速率常数（0.012 min ^-1 m ^{-2高10倍）}）。这些结果表明，BaTiO ₃和TiO ₂之间的界面对促进载流子的分离起到了主要作用，这也是本研究的独特之处。结合 DFT 建模计算和 COMSOL 仿真，论证了界面增强的压电光电子效应的机理。这项工作证明界面工程是提高压电光电催化性能的有效途径。