Wetting of a Charged Surface of Glassy Carbon by Molten Alkali-Metal Chlorides
- Authors: Stepanov V.P.1,2
-
Affiliations:
- Institute of High Temperature Electrochemistry
- Ural Federal University
- Issue: Vol 92, No 3 (2018)
- Pages: 570-574
- Section: Physical Chemistry of Surface Phenomena
- URL: https://journals.rcsi.science/0036-0244/article/view/169941
- DOI: https://doi.org/10.1134/S0036024418030287
- ID: 169941
Cite item
Abstract
Values of the contact angle of wetting of a surface of glassy carbon by molten chlorides of lithium, sodium, potassium, and cesium are measured by the meniscus weight method to determine the common factors of wettability of solid surfaces by ionic melts upon a change in the salt phase composition and a jump in electric potential. It is found that with a potential shift in the positive direction the shape of the curve of the contact angle’s dependence on the potential varies upon substitution of one salt by another: the angle of wetting shrinks monotonously in lithium chloride but remains constant in molten cesium chloride. This phenomenon is explained by the hypothesis that the nature of the halide anion adsorption on the positively charged surface of an electrode is chemical and not electrostatic. It is shown that the adsorption process is accompanied by charge transfer through the interface, with covalent bonding between the adsorbent and adsorbate.
Keywords
About the authors
V. P. Stepanov
Institute of High Temperature Electrochemistry; Ural Federal University
Author for correspondence.
Email: v.stepanov@ihte.uran.ru
Russian Federation, Yekaterinburg, 620990; Yekaterinburg, 620014