Abstract
A co-based porous metal-organic framework (MOF) of zeolitic imidazolate framework-67 (ZIF-67) and carbon nanofibers (CNFs) was utilized to prepare a ZIF-67/CNFs composite via a one-pot synthesis method. Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD) were employed to investigate the morphology, structure, and composition of the resulting composite. A novel high-performance non-enzymatic electrochemical sensor was constructed based on the ZIF-67/CNFs composite. The ZIF-67/CNFs based sensor exhibited enhanced electrocatalytic activity towards H2O2 compared to a pure ZIF-67-based sensor, due to the synergistic effects of ZIF-67 and CNFs. Meanwhile, chronoamperometry was utilized to explore the detection performance of the sensor. Results showed the sensor displayed high-efficiency electrocatalysis towards H2O2 with a detection limit of 0.62 μM (S/N = 3), a sensitivity of 323 µA mM−1 cm−2, a linear range from 0.0025 to 0.19 mM, as well as satisfactory selectivity and long-term stability. Furthermore, the sensor demonstrated its application potential in the detection of H2O2 in food.
Highlights
Hydrogen peroxide (H2 O2 ), as an important industrial chemical, has been widely applied in various fields, including food production, medicine manufacture, clinic treatment, etc [1,2,3]
It can be observed that the surfaces of fibers were smooth, with no impurities on them
All chemicals were of analytical grade and used without further purification
Summary
Hydrogen peroxide (H2 O2 ), as an important industrial chemical, has been widely applied in various fields, including food production, medicine manufacture, clinic treatment, etc [1,2,3]. There are various kinds of methods for monitoring H2 O2 , such as chemiluminescence, titrimetry, electrochemistry, spectrometry and high performance liquid chromatography [7,8,9,10,11]. Among these methods, the electrochemical technique using natural enzymes is becoming increasingly popular due to its intrinsic advantages including simple operation, low cost, good selectivity, and high sensitivity [12,13].
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