Nucleation and growth of Cu onto polycrystalline Pt electrode from acidic CuSO4solution in the presence of H2SeO3

Autor: Šimkūnaitė, Dijana, Ivaškevič, Emilija, Kaliničenko, Aleksandras, Steponavičius, Antanas
Zdroj: Journal of Solid State Electrochemistry; July 2006, Vol. 10 Issue: 7 p447-457, 11p
Abstrakt: The early stages of Cu electrodeposition onto Pt(poly) have been investigated in 0.5 M H2SO4+ 0.01 M CuSO4solution without or with H2SeO3when a molar concentration ratio [Cu(II)]/[Se(IV)] ≥ 2×102using electrochemical and ex situ AFM techniques. The overpotential deposition of Cu has been performed onto a Pt surface precovered independently with Cu in amount close to an equivalent monolayer. Chronoamperometric results have been shown to follow an instantaneous 3D nucleation and diffusion-controlled growth model. The values of diffusion coefficient Dfor Cu2+, number of nuclei Nand average nuclei radius ravhave been calculated. In the local regions of the surface, the separate large agglomerates composed of the different diameter clusters have been revealed in both cases, but, in the presence of the H2SeO3, they attained a distinct chain-like configuration. Some morphological characteristics have been reported.The early stages of Cu electrodeposition onto Pt(poly) have been investigated in 0.5 M H2SO4+ 0.01 M CuSO4solution without or with H2SeO3when a molar concentration ratio [Cu(II)]/[Se(IV)] ≥ 2×102using electrochemical and ex situ AFM techniques. The overpotential deposition of Cu has been performed onto a Pt surface precovered independently with Cu in amount close to an equivalent monolayer. Chronoamperometric results have been shown to follow an instantaneous 3D nucleation and diffusion-controlled growth model. The values of diffusion coefficient Dfor Cu2+, number of nuclei Nand average nuclei radius ravhave been calculated. In the local regions of the surface, the separate large agglomerates composed of the different diameter clusters have been revealed in both cases, but, in the presence of the H2SeO3, they attained a distinct chain-like configuration. Some morphological characteristics have been reported.
Databáze: Supplemental Index
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