Improved Piezocatalytic Performance of Cs/KNN Decorated with CuS Nanoparticles for Dye Degradation

Niobate materials have garnered significant interest in recent years due to their potential applications across various fields. As a special property, piezoelectric catalysts based on niobate remain underexplored, primarily due to their chemical inertness and low piezoelectric activity. The development of niobate catalysts with stable and efficient properties continues to pose challenges in the fields of chemistry and materials science. In this study, a novel 30%CuS/0.21%Cs/KNN composite has been successfully synthesized using a facile hydrothermal method by depositing CuS nanoparticles on the external surface of 0.21%Cs/KNN cube. By controlling the loading amount of CuS, the catalytic degradation activity of title composite for methyl green MG reached the highest point of 99.5% under low‐power ultrasound (50 W), which is much higher than that of 0.21%Cs/KNN (7.5 times) and CuS (5.5 times). In addition, atomic force microscopy (AFM) and electrochemical tests demonstrated that the composites have good piezocatalytic properties. This work provides a meaningful strategy for promoting piezoelectric catalytic degradation using material compounding.