Abstract: The morphology and microstructure of the electrodes under ultrasound were observed and analyzed by means of
ESEM and XRD. The effects of ultrasonic irradiation time on the electrochemical active surface of the Ti/SnO₂+Sb₂O₃/PbO₂ electrodes in 1.0mol/L
H₂SO₄ solutions were studied by cyclic voltammetry. The experimental results show that the ultrasound has the influence on the morphology and
microstructure of the electrodes surfaces. Under ultrasound for 20min, the cyclic voltammetric peak current density is about two times as high as that
of the anode without ultrasonic irradiation. The voltammetric charge of the electrodes increases firstly as the time under ultrasound increases, after
ultrasonic irradiation 20min, and the voltammetric charge decreases with increasing ultrasonic irradiation time. The voltammetric charge is the highest under the condition of ultrasonic irradiation for 20min, which
means that the electrochemical active surface of the electrodes is the largest at the ultrasonic irradiation time.

Key words: electrode, PbO₂, ultrasound