Etude comparative des propriétés électriques de PbO2 préparé par voie chimique et électrochimique

Abstract

Lead dioxide is frequently used in the industry for is excellent property such as his cycle life, its high conductivity, its low price and its high strong stability en sulfuric acid. It’s well known that PbO2 prepared by chemical route is inactive, whereas that synthesis electrochemically is active. The addition of surfactant to during the preparation of the two varieties das not influence the PbO2 phase but it significantly influences its crystallite size. The results showed that the amount of water present in the hydrated zones mainly de spends on the crystallite size. A comparative study shows a difference in the reactivity of both chemical and electrochemical PbO2. A remarkable increase in the discharge capacity is observed for electrochemical PbO2 that represents the lowest crystalline (10 nm) because this water is well ordered and dispersed with comparison to the chemical sample, which presents surface water reportied aleatoiry.