Voltammetric behaviour and amperometric sensing of hydrogen peroxide on a carbon paste electrode modified with ternary silver-copper sulfides containing intrinsic silver

The electrochemical behavior of three ternary mixed silver-copper sulfides toward hydrogen peroxide, at various pH values, is presented. Electrochemical characterization, performed using modified carbon paste electrode, revealed that the material that consists of Ag 1.2 CuS 2 , AgCuS, and intrinsic...

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Bibliographic Details
Published in:Monatshefte für Chemie 2020-04, Vol.151 (4), p.511-524
Main Authors: Buljac, Maša, Krivić, Denis, Škugor Rončević, Ivana, Vladislavić, Nives, Vukadin, Jela, Buzuk, Marijo
Format: Article
Language:English
Subjects:
Acids
Analytical Chemistry
Carbon
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Citric acid
Contact lenses
Copper
Copper sulfides
Electrical measurement
Electrochemical analysis
Electrodes
Hydrogen peroxide
Inorganic Chemistry
Oleic acid
Organic Chemistry
Original Paper
Physical Chemistry
Reproducibility
Silver chloride
Theoretical and Computational Chemistry
Uric acid
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Summary:The electrochemical behavior of three ternary mixed silver-copper sulfides toward hydrogen peroxide, at various pH values, is presented. Electrochemical characterization, performed using modified carbon paste electrode, revealed that the material that consists of Ag 1.2 CuS 2 , AgCuS, and intrinsic metallic silver showed favorable electrochemical signal in the presence of H 2 O 2 , when measurements were performed at pH 5. According to the results of the additional electrochemical investigation, a novel mechanism involved in the genesis of electroanalytical signal is proposed. Obtained electronalytical signal, at operating potential of the 0 V (vs. Ag/AgCl) toward H 2 O 2 , is proposed to proceeds according to the chemical-electrochemical (CE) mechanism without direct electrochemical reaction of H 2 O 2 at the electrode. The amperometric response is linear in the 1–1000 μM H 2 O 2 concentration range with a detection limit of the 0.055 μM. Sensitivity is calculated to be 16.82 μA cm −2  mM −1 . As optimum pH value, pH 5 was selected. In the presence of the uric acid, asorbic acid, oleic acid, citric acid, and glucose no interference on the amperometric signal was observed. Being a robust and a simple electrode, with remarkable stability, repeatability, and reproducibility, the optimized electrode was successfully tested for determination of the hydrogen peroxide in a commercially available contact lens solution. Graphic abstract
ISSN:0026-9247
1434-4475
DOI:10.1007/s00706-020-02588-4