The superior piezo-photocatalytic performances of KNbO₃-based materials were achieved by the enhanced photo-induced carrier separation and migration based on the effective strategies of heterojunction construction and polarization engineering. A KNbO₃/WO₃ type-II heterojunction was fabricated by an impregnation-calcination method, and its outstanding piezo-photocatalytic performance was demonstrated. Compared to individual KNbO₃ and WO₃, KNbO₃/WO₃ composites exhibited better degradation performance for RhB solution under visible light irradiation, and the degradation rate of 30%KNbO₃/WO₃ composite for RhB solution was 98% within 80 min (its reaction rate constant k was 0.03894 min^-1). Inspiringly, the polarized 30%KNbO₃/WO₃ composite degraded RhB solution completely within 60 min under visible light irradiation with auxiliary ultrasonic activation, and its reaction rate constant was up to 0.0612 min^-1 (3.35 times that of individual KNbO₃). The synergistic effects of heterojunction construction, polarization engineering, and ultrasonic vibration in KNbO₃/WO₃ composite were confirmed, and the multi-electric fields in polarized KNbO₃/WO₃ heterojunction significantly enhanced carrier separation, thus promoting piezo-photocatalysis. This work proposes an important strategy for designing multi-electric field-driven ferroelectric-based heterojunction photocatalysts.

基于异质结构建和极化工程的有效策略，通过增强光诱导载流子分离和迁移，实现了KNbO ₃基材料优异的压电光催化性能。采用浸渍-煅烧法制备了KNbO ₃ /WO _{3 II 型异质结，并展示了其出色的压电光催化性能。}与单独的KNbO ₃和WO ₃相比，KNbO ₃ /WO ₃复合材料在可见光照射下对RhB溶液表现出更好的降解性能，30%KNbO ₃ /WO _{3的降解率}RhB溶液在80 分钟内复合为98%（其反应速率常数k为0.03894  min ^-1）。令人鼓舞的是，极化的30%KNbO ₃ /WO ₃复合材料在可见光照射下辅助超声活化60分钟内完全降解RhB溶液 ，其反应速率常数高达0.0612  min ^-1（是单独KNbO ₃的3.35倍）。_{确认了 KNbO 3} /WO ₃复合材料中异质结结构、极化工程和超声振动的协同效应，并证实了极化 KNbO ₃ /WO中的多电场₃异质结显着增强了载流子分离，从而促进了压电光催化。这项工作提出了设计多电场驱动的铁电基异质结光催化剂的重要策略。