The temperature dependence of the rate constant and the effective diffusion coefficient of incorporation of lead atoms from an underpotential monolayer adsorbate on Ag(ll1) into the silver crystal lattice at low and high coverages is investigated. The transfer activation energy in both cases and the
Modelling transformation processes in underpotential lead adsorbate on Ag(111)
โ Scribed by A. Popov; N. Dimitrov; T. Vitanov; D. Kashchiev; E. Budevski
- Book ID
- 103067616
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 506 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0013-4686
No coin nor oath required. For personal study only.
โฆ Synopsis
The transformation processes at low coverage of lead underpotential adsorbate on quasiperfect (111) faces of silver single crystals are discussed in view of the influence of the atomic surface relief on the process kinetics. The results are compared with those on real silver electrodes. A conclusion is made that on quasi-perfect electrodes the transformation processes take place predominantly on the atomically smooth terraces while on real electrodes these processes occur both on the terraces and at the steps of the surface. This effect is explained to be due to the different step density on the electrode surfaces studied.
๐ SIMILAR VOLUMES
## Ahseact -Taking into consideration our previous results an attempt is made to describe by a theoretical model the transformation processes in underpotential Pb adsorbate on Ag( 111) at low coverages. The results of the model are in good agreement with the experimental data.
## Abstrad-A theoretical model is proposed for the transformation processes in Pb monolayers of high coverages, underpotentially adsorbed on Ag(ll1). The basic assumption is that these processes are due to one-dimensional diffusion from a thin layer which under the experimental conditions is repre
Previous study of underpotential deposits of Pb and Tl on chemically polished Ag(l11) substrates has shown that under certain conditions slow structural transformations in the submonolayer coverage take place. Voltammetric measurements taken by us on electrolytically grown Ag(ll1) and Ag(100) electr