This paper reports the use of the hydrothermal method in the fabrication of pure BiFeO₃ (BFO) films with various morphologies [microparticle (BFO_MP), microplate (BFO_MPL), and microsheet (BFO_MS)] on fluorine-doped tin oxide substrates and their applications in piezophotodegradation and piezophotoelectrochemical water splitting. These samples exhibited p-type characteristics, band gaps of approximately 2.1 eV, and favorable crystal. Piezoresponse force microscopy revealed that the piezoelectric coefficients of BFO_MP, BFO_MPL, and BFO_MS were 13.0, 18.6, and 15.3 pm V⁻¹, respectively. The associated piezotronic and piezophototronic characteristics of the samples were verified through facile current–voltage measurement, which revealed that BFO_MPL outperformed BFO_MP and BFO_MS. Electrochemical and photoluminescence (PL) analyses demonstrated that BFO_MPL possessed the highest electrochemical surface area per-unit mass (22.6 mF cm⁻² mg⁻¹) and the weakest PL emission. The combination of these characteristics and the favorable energy band positions under stress of BFO_MPL contributed to its excellent piezophotocatalytic performance, with a piezophotodegradation rate constant of approximately 19.8 × 10^–3 min⁻¹ for methylene blue solutions, a piezophotoelectrochemical current density of approximately − 0.83 mA·cm⁻² at −0.6 V (vs. Ag/AgCl) and a maximum piezo-induced applied bias photon-to-current conversion efficiency of 0.54% at −0.51 V. Based on the enhanced piezoelectricity, which can effectively enhance the separation of photogenerated electron-hole pairs, thus improving photocatalyst performance. BFO_MPL also exhibited good reusability and versatility toward degrading different organic pollutants. The results indicate that our samples are promising for application in environmental sustainability.

本文报道了水热法在氟掺杂氧化锡基板上制备具有各种形态[微粒 (BFO _MP )、微板 (BFO _MPL ) 和微片 (BFO _{MS )] 的纯 BiFeO 3} (BFO) 薄膜中的应用及其在压电光降解和压电光电化学水分解中的应用。这些样品表现出p型特性、约2.1 eV的带隙和良好的晶体。压电响应力显微镜显示 BFO _MP、BFO _MPL和 BFO _MS的压电系数分别为 13.0、18.6 和 15.3 pm V ^-1， 分别。通过简单的电流-电压测量验证了样品的相关压电和压电光电子特性，这表明 BFO _MPL的性能优于 BFO _MP和 BFO _MS。电化学和光致发光 (PL) 分析表明，BFO _MPL具有最高的单位质量电化学表面积 (22.6 mF cm ^-2 mg ^-1 ) 和最弱的 PL 发射。这些特性与 BFO _MPL在应力下的有利能带位置相结合，使其具有优异的压电光催化性能，压电光降解速率常数约为 19.8 × 10 ^–3min ^-1对于亚甲蓝溶液，在 -0.6 V（相对于 Ag/AgCl）下的压电光电化学电流密度约为 - 0.83 mA·cm ^-2和最大的压电感应施加的偏置光子到电流的转换效率为 0.54%在-0.51 V。基于增强的压电性，可有效增强光生电子-空穴对的分离，从而提高光催化剂性能。BFO _MPL在降解不同有机污染物方面也表现出良好的可重复使用性和多功能性。结果表明，我们的样品有望用于环境可持续性。