Corresponding Author

Juan-qin XUE(huagong1985@163.com)


In order to investigate the effects of temperature on the nucleation and growth of lead dioxide (PbO2), the in situ electrochemical depositions of PbO2 were carried out on the glassy carbon electrode at different temperatures, namely, 25℃,35℃, 45℃, 55℃, and 65℃.The cyclic voltammetric curves, the time-current and the time-potential curves,SEM images and XRD patterns of the PbO2 coatings deposited at different temperatures were obtained. The results showed that the PbO2 underwent nucleation and grew at different temperatures. The 3D continuous nucleation mode of PbO2 electrodeposition remained unchanged with the increase of temperature. However, the solution resistance during the deposition process was decreased. The nucleation rate and the crystal growth rate were both promoted by the increase of temperature. Before reaching the saturated nucleation density, the nucleation rate was accelerated,and the size of PbO2 particles was reduced. During the later stage of the deposition, once the saturated nucleation density was attained, the nucleation rate became prodimnant, which adversely influenced the crystal growth rate,and the coating was not conductive to the formation of small PbO2 particles. High temperature enhanced the oxygen evolution rate and increased the energy consumption. The average particle size of PbO2 obtained at 55 ℃ was the smallest one among the five temperatures tested.

Graphical Abstract


PbO2, electrodeposition, nucleation and growth, temperature

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