Original scientific paper

https://doi.org/10.5599/jese.689

Formation and reduction of anodic film on polycrystalline Bi electrode in pure methanol solutions

Anastos G. Anastopoulos orcid.org/0000-0003-0842-7765 ; Laboratory of Physical Chemistry, Department of Chemistry Aristotle University of Thessaloniki,Greece
Athanasios A. Papaderakis ; Laboratory of Physical Chemistry, Department of Chemistry Aristotle University of Thessaloniki,Greece

Abstract

The processes of film formation and reduction of bismuth in pure methanol are phenomenologically studied by means of cyclic voltammetry, ac voltammetry and electrochemical impedance spectroscopy methods. Film formation takes place under low electrode potentials within the potential range from -0.1 to about 0.2 V vs. Ag|AgCl resulting in the development of Bi(CH3O)ads layer. The scan rate effect on the anodic current profile is interpreted in terms of a gradual variation of uncompensated resistance, accompanying the processes of film formation and reduction. Phase sensitive ac voltammetry measurements suggest leaky insulating character of a thin anodic film in agreement with the results of electrochemical impedance experiments.

Keywords

Anodic film formation; bismuth; methanol; methoxylation

Hrčak ID:

223242

URI

https://hrcak.srce.hr/223242

Publication date:

22.7.2019.

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