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Enzyme‐free Cu 2 O@MnO 2 /GCE for Hydrogen Peroxide Sensing
Author(s) -
Ouiram Tik,
Moonla Chocha,
Preechaworapun Anchana,
Tangkuaram Tanin
Publication year - 2019
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.201800897
Subject(s) - hydrogen peroxide , analytical chemistry (journal) , fourier transform infrared spectroscopy , materials science , detection limit , manganese , scanning electron microscope , spectroscopy , nuclear chemistry , chemistry , chemical engineering , physics , organic chemistry , chromatography , quantum mechanics , engineering , metallurgy , composite material
A novel composite material of copper (I) oxide at manganese (IV) oxide (Cu 2 O@MnO 2 ), was synthesized and applied for modification on the glassy carbon electrode (GCE) surface (Cu 2 O@MnO 2 /GCE) as a hydrogen peroxide (H 2 O 2 ) sensor. The composite material was characterized regarding its structural and morphological properties, using field emission scanning electron microscopy (FE‐SEM), energy‐dispersive X‐ray spectroscopy (EDX), X‐ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The Cu 2 O@MnO 2 /GCE showed an excellent electrocatalytic response to the oxidation of H 2 O 2 which provided a 0.56 s −1 charge transfer rate constant ( K s ), 1.65×10 −5 cm 2 s −1 diffusion coefficient value ( D ), 0.12 mm 2 electroactive surface area ( A e ) and 1.04×10 −8 mol cm −2 surface concentration ( γ). At the optimal condition, the constructed sensor exhibited a wide linear range from 0.5 μM to 20 mM with a low limit of detection (63 nM, (S/N=3) and a good sensitivity of 256.33 μA mM −1 cm −2 . It also presented high stability (ΔI response ±15 %, n=100), repeatability (1.25 %RSD, n=10) and reproducibility (3.55 %RSD, n=10). The results indicated that the synthesized Cu 2 O@MnO 2 was successfully used as a new platform for H 2 O 2 sensing.