Study of adsorption and oxidation of thiocyanate at the metal / solution interface by EQCM and EIS

Omar Israel González Peña, Yunny Meas Vong, Thomas W. Chapman, René Antaño López

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Thiocyanate (SCN-) is widely used in industrial and scientific areas; nevertheless, few studies have been made to understand the mechanism of adsorption and electrochemical oxidation of SCN-. This work shows the results of a study of the adsorption and oxidation of SCN- at different concentrations on a Pt electrode in a 0.1M HClO4 electrolyte solution. In the behavior of this system, studied with an Electrochemical Quartz Crystal Microbalance (EQCM) coupled with Cyclic Voltammetry (CV), we observed an irregular tendency of anodic current with respect to the concentration of the additive. To understand this, we used Electrochemical Impedance Spectroscopy (EIS), testing four different reaction mechanisms that involve the adsorption and oxidation of thiocyanate. For each one of the tested mechanisms a transfer function was proposed and fitted to the experimental data. According to the pattern recognition method, the best fitted mechanism involves the formation of (SCN)2 as an intermediate. copyright The Electrochemical Society.

Original languageEnglish
Title of host publicationECS Transactions - Molecular Structure of the Solid-Liquid Interface and Its Relationship to Electrodeposition 5
PublisherElectrochemical Society Inc.
Pages9-17
Number of pages9
Edition17
ISBN (Print)9781604233704
DOIs
Publication statusPublished - 2006
Externally publishedYes
EventMolecular Structure of the Solid-Liquid Interface and Its Relationship to Electrodeposition 5 - 210th ECS Meeting - Cancun, Mexico
Duration: 29 Oct 20063 Nov 2006

Publication series

NameECS Transactions
Number17
Volume3
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Conference

ConferenceMolecular Structure of the Solid-Liquid Interface and Its Relationship to Electrodeposition 5 - 210th ECS Meeting
Country/TerritoryMexico
CityCancun
Period29/10/063/11/06

All Science Journal Classification (ASJC) codes

  • General Engineering

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