Concave gas–liquid interface geometry as an acoustic field modulator for enhancing contact-electro-catalysis

Standing-wave-induced energy localization fundamentally limits the efficiency of ultrasound-driven contact-electro-catalysis (CEC), restricting effective coupling between mechanical excitation and catalytic reactions. Here, we report an acoustic field reconstruction mechanism in which the gas–liquid interface geometry functions as an active modulator of the acoustic field. A dynamically formed concave interface, generated through synchronized ultrasonic and stirring, redirects acoustic reflection pathways and disrupts standing-wave coherence. Acoustic simulations reveal that this curved interface enhances acoustic pressure amplitude and promotes a more homogeneous distribution of acoustic energy within the liquid phase. The reconstructed acoustic field significantly enhances catalytic performance across multiple reaction systems, including the degradation of representative organic molecules and the in-situ reduction of noble metal ions, following improved pseudo-first-order kinetics compared with conventional ultrasound-driven CEC. In addition to enhanced reactivity, reconstruction of the gas–liquid interface geometry reduces the overall energy consumption of the CEC system by approximately 32.99%. Importantly, this interfacial mechanism is independent of catalyst materials, highlighting the gas–liquid interface as a universal and reconfigurable functional element for regulating acoustic-electrochemical coupling. This work establishes an interfacial strategy for acoustic field manipulation, offering opportunities for the design of mechanically driven catalytic systems.