Cyclic Voltammetry on Ag(111) and Ag(100) Faces in Sodium Hydroxide Solutions

Published

June 1, 1999

Author(s)

B M. Jovic, V D. Jovic, Gery R. Stafford

Abstract

The electrochemical behavior of silver (100) and (111) single crystal surfaces was examined in aqueous NaOH solution. The first step of silver oxidation is the electrosorption of OH- ions followed by phase transformation into a monolayer. The difference in peak potentials recorded in 0.1 mol dm-3 and 0.01 mol dm-3 NaOH solution of about 60 mV indicates that one electron is exchanged in the overall electrosorption reaction, implying a complete charge transfer between OH- ions and the silver surface. The electrosorption process was modeled to a Frumkin adsorption isotherm. Further oxidation of silver into Ag₂O takes place at more positive potentials. The formation of bulk Ag₂O results in considerable change to the original single crystal surface. This is likely due to roughening of the silver surface due to the formation and reduction of the oxide.

Citation

Electrochemistry Communications

Volume

1

Issue

No. 6

Pub Type

Journals

Keywords

electrosorption, silver, silver oxide, sodium hydroxide

Citation

Jovic, B. , Jovic, V. and Stafford, G. (1999), Cyclic Voltammetry on Ag(111) and Ag(100) Faces in Sodium Hydroxide Solutions, Electrochemistry Communications (Accessed December 7, 2024)