Electrochemical hydrogen peroxide sensor based on a glassy carbon electrode modified with nanosheets of copper-doped copper(II) oxide

Abstract

A new electrochemical sensor for H 2 O 2 was constructed by depositing copper doped CuO nanosheets on a glassy carbon electrode (GCE). The morphology and composition of the modified electrode were characterized via scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction. The electrochemical properties of the electrode were studied using cyclic voltammetry and electrochemical impedance spectroscopy. The catalytic performance of the sensor was studied in 100 mM NaOH solution via differential pulse voltammetry and revealed the sensor to display significantly improved electrocatalytic activity with respect to the analysis of the H 2 O 2 in comparison to a plain GCE or a GCE modified with copper only. The response to H 2 O 2 at a working voltage of −0.46 V (vs. Ag/AgCl) is linear in the 0.003 -8 mM concentration range, and the detection limit is 0.21 mM (at an S/N ratio of 3). Satisfactory results were obtained in the analysis of tap, rain and river waters spiked with H 2 O 2 . The analytical performance of this electrode compares favorably to the results obtained with other commonly used techniques for analysis of H 2 O 2 .

Bare Platinum Nanoparticles Deposited on Glassy Carbon Electrodes for Electrocatalytic Detection of Hydrogen Peroxide

“…As higher performances were achieved with a 4 nm PtNP system (see below), measurements described below were carried out on it. Selectivity studies were carried out by analyzing the MPAD response of 4 nm PtNPs to several inorganic cationic and anionic species commonly found , in water samples (HCO 3 – , SO 4 2– , ClO 4 – , SO 3 2– , NO 3 – , Zn 2+ , Ca 2+ , Na + ), each at 0.2 mM, under the same conditions used for H 2 O 2 . To test 4 nm PtNP sensor selectivity, organic compounds , (i.e., cysteine and l -lysine) were also tested.…”

Ultra-small dispersed CuxO nanoparticles on graphene fibers for miniaturized electrochemical sensor applications

“…As a contrast, the sensing performances of recently reported H 2 O 2 sensors based on copper-based electrodes are shown in Table S2. † [32][33][34][35][36][37][38][39][40][41] Detection limit of 0.023 mM and linear range of 0.07-133 mM achieved by using the Cu x ONPs 60 /GF 400 . The overall performance of Cu x ONPs 60 /GF 400 exceed the most of copperbased electrodes, which beneting from the unique Fig.…”

Synthesis and Biomedical Applications of Copper Oxide Nanoparticles: An Expanding Horizon

“…Among the conventional methods, the electrochemical technique is quite promising owing to its simple, rapid, and cost-effective characteristics; however, these techniques need a stable and high-performance electrocatalyst in the form of meta/metal oxide nanoparticles . Though an enzymatic sensor employing “horseradish peroxidase” as a biological element can achieve high sensitivity and selectivity, due to the intrinsic nature of enzyme including low stability and reproducibility, more attempts have been made to fabricate a nonenzymatic sensor for peroxide detection. − CuO nanoparticles have the potential to oxidize various chemical compounds and are reported to mimic the peroxidase activity. ,, Based on the fact that the catalytic properties are highly dependent on CuO morphology, different nanostructures including nanoflowers, nanoplatelets, nanowires, nanocubes, and nanoleaves have been synthesized and further used for nonenzymatic determination of H 2 O 2 . It is highly probable that there is an interconversion among various structures as a function of time, reactants concentration, and other reaction parameters as observed during the synthesis of 3D CuO nanoflowers .…”