Abstract
The influence of ‘hydrogen loss’ on the electrochemical properties of both ;-PbO 2 and ;-PbO 2 was studied using galvanostatic discharge and cyclic voltammetry. The thermal decomposition of electroformed PbO 2 shows two types of hydration water: the first type, which disappears at low temperature, is adsorbed on the surfaces of the PbO 2 particles, and the second one is localized within the PbO 2 crystal structure. The reduction process of PbO 2 in lead/acid cells is mainly determined by diffusion processes within the oxide. The hydrogen diffusion coefficient t H in lead dioxide has been determined at 25 °C; the values obtained are between 0.42 and 1.67 × 10 7 cm 2 s 1. The remo. The removing of ‘structurally bonded’ water, by heating the samples at 230 °C, affects considerably the electrochemical properties of PbO 2 and leads to a decrease in t H..
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