Premium
Electrocatalytic Sensor for Hydrogen Peroxide Based on Immobilized Benzoquinone
Author(s) -
Laroussi Arwa,
Raouafi Noureddine,
Mirsky Vladimir M.
Publication year - 2021
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.202100113
Subject(s) - hydrogen peroxide , chemistry , monolayer , amperometry , inorganic chemistry , electrochemistry , electrode , electrochemical gas sensor , cyclic voltammetry , benzoquinone , photochemistry , organic chemistry , biochemistry
An amperometric chemosensor for the detection of hydrogen peroxide is reported. The sensor is based on 1,4‐benzoquinone immobilized on the gold electrode using self‐assembled monolayer of short chain symmetrical dithiol as an anchor layer. Sensor analysis was performed by cyclic voltammetry at the potential range from −0.6 V till +0.9 V as well as in the anodic or cathodic potential ranges only. The results indicate oxidative electrochemical decomposition of hydrogen peroxide at the potential of ∼+0.4 V leading to the formation of oxygen while at cathodic potentials a reduction of the formed oxygen as well as of the hydrogen peroxide occur. A decrease in the oxidation potential of hydrogen peroxide on the gold electrode coated by self‐assembled monolayer with 1,4‐benzoquinone in comparison with that measured on the electrodes coated by the same self‐assembled monolayer without 1,4‐benzoquinone, indicates electrocatalytic effect of this moiety on oxidative decomposition of hydrogen peroxide. Analytical evaluation of the sensor performance was done in the voltammetric as well as in the chronoamperometric mode. The sensor exhibited linear response over the concentration range till 2.5 mM with a limit of detection ∼4 μM.