Electrochemical Behavior of a Glassy Carbon Electrode Chemically Modified with Nickel Pentacyanonitrosylferrate in Presence of Sulfur Compounds

Author(s)

Paim, Leonardo L. ^[1] ; Hammer, Peter ^[2] ; Stradiotto, Nelson R. ^[1]

Affiliation

^[1] UNESP, Inst Quim, Dept Quim Analt, BR-14801970 Araraquara, SP - Brazil

^[2] UNESP, Inst Quim, Dept Fis Quim, BR-14801970 Araraquara, SP - Brazil

• Document type: Journal article
• Source: Electroanalysis; v. 23, n. 6, p. 1488-1496, JUN 2011.
• Web of Science Citations: 1

Abstract

The glassy carbon electrode was modified with a nickel pentacyanonitrosylferrate film by electrodeposition of Ni and subsequent derivatization with NaPCNF. The film was characterized by XPS and electrochemical methods. Cyclic voltammetry of the NiPCNF onto the GC shows a redox couple (Fe(III)/Fe(II)) with E(ol) of 538 mV (I(pa)/I(pc) around 1) and Delta E(p) of 93 mV in 0.5 mol L(-1) KNO(3), with a diffusion-controlled process. There was a decrease of anodic peak currents of the film in the presence of sulfide and 2-propanethiol due to a precipitation reaction on the film surface by nucleophilic attack. (AU)

• FAPESP's process: 07/07700-7 - Development of sensors based on modified electrodes with pentacyanonitrosylferrates for determination of sulphur components in natural gas
• Grantee: Leonardo Lataro Paim
• Support Opportunities: Scholarships in Brazil - Doctorate