Crystal face specificity of fluoride adsorption on Ag electrodes: the (111) face

✍ Scribed by L. Doubova; S. Trasatti

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 632 KB
• Volume: 42
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/s0013-4686(96)00338-6

✦ Synopsis

Adsorption of F-on the (111) face of Ag single-crystal electrodes was studied by capacitance measurements in mixed electrolyte solutions of general composition c NaF + (0.04 -c) KPF6. Results have shown that F-ions adsorb more strongly on the (111) face than on the (110) face, a fact which is explained in terms of lower "hydrophilicity" of the (111) surface. Adsorption has been found to conform to a virial isotherm with A,dG" increasing linearly and ion-ion interaction decreasing exponentially with the positive charge on the metal. The weaker ion-ion interaction on the (111) face with respect to the (110) face is explained in terms of higher partial charge transfer from F-to the (111) face owing to the higher electronegativity of the latter.