The Effect of Concentration In Electrochemical Oxidation of Thiocyanate On Platinum Electrode

Document Type

Article

Publication Date

9-1-2007

Department

Polymers and High Performance Materials

Abstract

Electrochemical oxidation of thiocyanate (SCN-) on platinum electrode in the sulfuric acid medium was studied using cyclic voltammetry, in situ UV-visible absorption measurement, rotating ring-disc electrode voltammetry, and electrical impedance spectroscopy. Two oxidation processes are involved in the electrochemical oxidation of SCN- in sulfuric acid medium. The adsorbed SCN- undergoes oxidation at potential values higher than 0.900 V versus saturated calomel electrode (SCE). Trithiocyanate,(SCN)(-)(3), is formed as a relatively stable product during the first oxidation process. The potential range of (SCN)(-)(3) formation increases with increase in concentration of SCN-, and it is exclusively produced in the potential range of 0.550 to 1.40 V versus SCE with 1.0 M NH4SCN solution. The second oxidation process does not produce any stable product, and the products of second oxidation passivate the electrode surface.

Publication Title

Journal of Solid State Electrochemistry

Volume

11

Issue

9

First Page

1327

Last Page

1334

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