Abstract
High energy ball-milling (HEBM) of pure lead dioxide was performed in function of the milling time. HEBM leads to a transition of the initial tetragonal structure (beta-PbO2) to an orthorhombic structure (alpha-PbO2). After 1 h of milling, the PbO2 powder is composed of ~80 wt% alpha-PbO2, and this proportion does not change even if milling is prolonged. The mean crystallite size of beta-PbO2 is reduced during ball-milling. HEBM also induces morphological changes in the powder. Cyclic voltammetry in 1M H2SO4 was performed using a cavity microelectrode. The voltammograms of powder milled for different durations are similar. However, a variation of the reduction and the oxidation potential occurs when commercially available PbO2 is ball-milled.
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