TY - GEN
T1 - Study of adsorption and oxidation of thiocyanate at the metal / solution interface by EQCM and EIS
AU - Peña, Omar Israel González
AU - Vong, Yunny Meas
AU - Chapman, Thomas W.
AU - López, René Antaño
PY - 2006
Y1 - 2006
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=45849129442&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=45849129442&partnerID=8YFLogxK
U2 - 10.1149/1.2721502
DO - 10.1149/1.2721502
M3 - Conference contribution
AN - SCOPUS:45849129442
SN - 9781604233704
VL - 3
T3 - ECS Transactions
SP - 9
EP - 17
BT - ECS Transactions - Molecular Structure of the Solid-Liquid Interface and Its Relationship to Electrodeposition 5
PB - Electrochemical Society Inc.
T2 - Molecular Structure of the Solid-Liquid Interface and Its Relationship to Electrodeposition 5 - 210th ECS Meeting
Y2 - 29 October 2006 through 3 November 2006
ER -