Abstract
The electrodeposition of lead sulphide on polycrystalline lead from aqueous sulphide solutions has been investigated. At low deposition potentials, a unit cell of galena oriented on the (110) plane is deposited through a two-dimensional nucleation and growth mechanism. Non-linear two-dimensional growth rates have been observed, possibly caused by impedements originated in the grain structure of the underlying substrate. High field growth of a thicker lead sulphide film occurs at higher potentials, and dielectric breakdown was observed at fields of ca 4 × 10 +6 V cm ±1. The electrochemical reactions attending the film formation process are discussed on the basis of variations in the voltammetric peak potentials with sulphide concentration and pH.
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