Hierarchical Bi₂Fe₄O₉/BiOI S-scheme nanoflower heterostructures are prepared by hydrothermal method, which exhibit exceptional photo-piezoelectric catalytic performance. The tight binding between the sheets ensures the efficient electron transport, and provides a large interface area and adequate reaction sites for photo-piezoelectric catalytic reactions. At the same time, because the water flow in the water body produces hydraulic shear force on the material, the material produces piezoelectric effect. Bi₂Fe₄O₉/BiOI exhibit a remarkable degradation efficiency of 99.4% for tetracycline and a hydrogen production rate of 4089.36 µmol h⁻¹ g⁻¹. The observed behavior can be explained by the combined influence of the formation of S-scheme structure and the process of photo-piezoelectric catalysis, confirmed by in-situ XPS, transient/steady-state fluorescence and piezoelectric response force test. The excellent stability of the material suggests its possible use in the sectors of energy and environment. This work introduces novel concepts for the future advancement of photo-piezoelectric synergistic catalysis.

采用水热法制备了多级Bi ₂ Fe ₄ O ₉ /BiOI S型纳米花异质结构，具有优异的光压电催化性能。片材之间的紧密结合确保了有效的电子传输，并为光电催化反应提供了大的界面面积和足够的反应位点。同时，由于水体中的水流对材料产生水力剪切力，使材料产生压电效应。 Bi ₂ Fe ₄ O ₉ /BiOI对四环素的降解效率高达99.4%，产氢率为4089.36 µmol h ^-1 g ^-1 。观察到的行为可以通过S型结构的形成和光电催化过程的综合影响来解释，并通过原位XPS、瞬态/稳态荧光和压电响应力测试证实。该材料优异的稳定性表明其可用于能源和环境领域。这项工作为光压电协同催化的未来发展引入了新概念。