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Dissociative adsorption of thiourea at a polycrystalline silver electrode in alkaline media

✍ Scribed by Maria Hepel; Stanley Bruckenstein

Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
523 KB
Volume
32
Category
Article
ISSN
0013-4686

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✦ Synopsis

alkaline solutions, when the potential of the silver electrode is more positive than -450 mV vs see, thiourea undergoes decomposition and a sparingly soluble silver sulfide film forms as a product of the accompanying anodic reaction. These processes are controlled by convective diffusion and depend upon the thiourea concentration. During the reverse cathodic scan, two cathodic stripping peaks are observed. The first one corresponds to the stripping of Ag,S (bulk) and the second one to the stripping of an adsorbed layer of AgZS. Hydrosulfide ions (HS) are produced by these two cathodic reactions. The formation of an adsorbed layer of Ag,S has been confirmed in rotating ring-disk electrode experiments.

πŸ“œ SIMILAR VOLUMES

Adsorption of thiourea at the polycrysta
Adsorption of thiourea at the polycrystalline silver electrode from aqueous KF solutionsβ€”I
✍ Magdalena Milkowska πŸ“‚ Article πŸ“… 1987 πŸ› Elsevier Science 🌐 English βš– 337 KB

Differential capacity of polycrystalline silver electrode in aqueous KF solutions containing thiourea (TU) of concentrations from 0.001 to 0.25 mol drnm3 has been measured by the previously described potentiostatic method CM. Brzostowska-Smolska et al., J. electroanal. Chem. 89, 389 (1978)]. The TU