Abstract
Au/Cu2O nanocomposites were successfully synthesized by a facile one-pot redox reaction without additional reducing agent under room temperature. The morphologies and structures of the as-prepared products were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The electrocatalytic performance of Au/Cu2O nanocomposites towards hydrogen peroxide was evaluated by cyclic voltammetry (CV) and chronoamperometry (CA). The prepared Au/Cu2O nanocomposite electrode showed a wide linear range from 25 to 11.2 mM (R = 0.9989) with a low detection limit of 1.05 μM (S/N = 3) and high sensitivity of 292.89 mA mM−1 cm−2. The enhanced performance for H2O2 detection can be attributed to the introduction of Au and the synergistic effect between Au and Cu2O. It is demonstrated that the Au/Cu2O nanocomposites material could be a promising candidate for H2O2 detection.
Highlights
In recent years, the accurate determination of H2O2 has attracted considerable attentions because it is an important intermediate in various fields, such as food, pharmaceutical, clinical, industrial, and environmental analyses [1,2,3,4]
It is clearly found that the surfaces of the asprepared Au/Cu2O nanocomposites were rough and uneven because of the generation of Au nanoparticles decorated on the surface of Cu2O
The energy dispersion spectroscopy (EDS) spectrum (Fig. 1d) confirms the presence of Au, Cu, and O elements, which agrees with the X-ray diffraction (XRD) spectrum analysis
Summary
The accurate determination of H2O2 has attracted considerable attentions because it is an important intermediate in various fields, such as food, pharmaceutical, clinical, industrial, and environmental analyses [1,2,3,4]. A quantity of techniques including spectrometry [5], titrimetry [6], chemiluminescence [7], and electrochemistry [8] have been developed for the quantification of H2O2. Among the above-mentioned techniques, electrochemical method is attractive due to its low-expense, perfect selectivity, high-sensitivity, and straightforward manipulation [9,10,11]. The enzyme-based electrochemical H2O2 sensors exhibit obvious advantages of high selectivity, the complicated immobilization procedure, poor stability, and high cost of the enzymes still limit their extensive applications [12, 13]. The development of enzymefree H2O2 sensors with peroxidase-like activity and enhanced performance has become a trend.
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