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(A) 20 kHz sonoreactor adapted as a sonoelectrochemical device: (1) lead dioxide electrode, (2) copper counter-electrode (foam geometry), (3) working solution, (4) cooling jacket, (5) glass cell, (6) Teflon holder, (7) ultrasonic transducer. (B) 40 kHz ultrasound bath: (1) lead dioxide electrode, (2) copper counter-electrode, (3) working solution, (4) ultrasonic bath, (5) ultrasonic transducers. Reprinted from [25] with permission from Elsevier.
