Graphene oxide-Cu(II) composite electrode for non-enzymatic determination of hydrogen peroxide
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Author list: Muralikrishna S., Cheunkar S., Lertanantawong B., Ramakrishnappa T., Nagaraju D.H., Surareungchai W., Balakrishna R.G., Reddy K.R.
Publisher: Elsevier
Publication year: 2016
Journal: Journal of Electroanalytical Chemistry (1572-6657)
Volume number: 776
Start page: 59
End page: 65
Number of pages: 7
ISSN: 1572-6657
Languages: English-Great Britain (EN-GB)
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Abstract
We report a novel graphene oxide-Cu(II) (GO-Cu2 +) composite electrode for electrochemical determination of hydrogen peroxide (H2O2) in neutral solution (pH = 7.4). Oxygen functional groups such as carboxylic acid, hydroxyl and epoxy present on GO are utilized for the formation of composite with Cu2 + ions. The synthesized GO-Cu2 + composite was characterized by X-ray diffraction (XRD) studies and cyclic voltammetry (CV). The surface morphology of the GO and GO-Cu2 + composite materials was observed by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Elemental analysis was performed using EDS. The prepared electrode showed a good electrocatalytic performance for reduction of H2O2 and mechanistic pathway has been discussed. Amperometric determination for H2O2 was carried out at a applied potential of − 0.25 V vs Ag/AgCl and the result showed a linear response range of 5 μM to 85 μM (correlation coefficient = 0.999) with a detection limit of 0.5 μM (S/N = 3). The sensitivity of the electrode was found to be 0.072 μA μM− 1 and the electrode selectively detected H2O2 in the presence of other potential interferences such as oxygen, glucose, ascorbic acid (AA), dopamine (DA) and uric acid (UA). © 2016 Elsevier B.V.
Keywords
Amperometric method, Graphene oxide-Cu (II) composite, non-enzymatic sensor
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