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The underpotential deposition of lead on single crystal silver cathodes has been investigated. Only a single monolayer of lead was formed on the (111) and (100) substrates but, on the (110) orientation, the deposition of a second layer started before the onset of bulk deposition. The pattern of an initial adsorption step followed by a sharp phase transformation process, analogous to that seen in thallium deposition, was also followed in this case. The amount of initial adsorption was small for the (111) case in contrast to the other two cases for which a complete superlattice of adsorbed lead was formed. The final phase layer was formed by the nucleation and growth of two-dimensional centres and its structure appeared to be distorted by the structure of the underlying substrate. Adsorbable anions modify the details of the deposition process.  相似文献   

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