ZnFe₂O₄/Graphitic Carbon Nitride Nano/Microcomposites for the Enhanced Electrochemical Sensing of H₂O₂

Abstract

Hydrogen peroxide (H2O2) sensors with high sensitivity and stable detecting ability have been particularly in demand in the charming medical health and environmental monitoring. In this work, spherical ZnFe2O4/g-C3N4 (ZFO/g-C3N4) nano/microcomposites with different contents of g-C3N4 were controllably synthesized through a solvothermal calcination strategy, and the morphologies of their target materials were systematically characterized via scanning electron microscopy, energy dispersive spectroscopy, high-resolution transmission electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. Subsequently, the as-prepared spherical ZFO/g-C3N4 composites are designed as an outstanding electrochemical sensor for H2O2, and its sensitivity was evaluated using cyclic voltammetry and chronoamperometry techniques. The ZFO/g-C3N4 microspheres exhibited a synergistic catalytic effect with a broad linear detection range between 5 and 200 μM and a detection limit of 1 μM (S/N = 3). The enhanced electrochemical performances of uniform ZFO/g-C3N4 composites with a three-dimensional net structure proved that the combination of a two-dimensional material (C3N4) and spinel-type metal oxide (ZnFe2O4) produces apparent activity, showing broad application potential in nonenzymatic sensors.

Synthesis of manganese molybdate/MWCNT nanostructure composite with a simple approach for supercapacitor applications

“…Additionally, the value of x-intercept (R s ) is attributed to the internal resistance of the powders as the electroactive materials. [56][57][58][59][60] It is apparent in the EIS curves that the R s values of the electrode containing the MMO and MMO/C powders are 2.1 and 1.8 U, respectively, demonstrating that the MMO/C reveals higher conductivity and improved mobility of ions. 61 Meanwhile, the radius of the semicircle region related to the MMO/C electrode is smaller, and as a result, its R ct value is lower than that of the MMO, which manifests better ionic exchange on the electrode/electrolyte interface.…”

“…Additionally, the value of x -intercept ( R s ) is attributed to the internal resistance of the powders as the electroactive materials. 56–60…”

Logic Gate Circuits Based on CeOx/WOy Memristor for the Odd/Even Checker and Encryption/Decryption of Image Applications

“…Zhou et al prepared a photoelectric memristor with two terminal structures based on CeO x /ZnO heterostructure, and tested its recognition, storage, and processing under visible light of 405 nm, indicating that it has great potential applications in artificial vision systems. [ 33 ] In addition, Yang et al [ 34 ] prepared a memristor device with Ag/TiO x /CeO y /FTO structure, in which it was found that the device shows volatile at low voltage, but it shows nonvolatile memory behavior at high voltage with typical memristive characteristics accompanied by negative differential resistance effect in the range of 3.5–4.0 V. Therefore, in the above works, the performance of the memristive devices has been significantly improved by introducing a double‐layer heterostructure due to the interface interaction formed by different material layers.…”

Comparison of Electrocatalytic Performance of CuCo2O4 Nanorods and Nanospheres Decorated with Co3S4 Nanosheets for Electrochemical Sensing of Hydrogen Peroxide and Glucose in Human Serum

“…The electrocatalytic performance of CuCo 2 O 4 can be enhanced by compositing this compound with carbon materials, metal oxides/sulfides, or polymers. , The improved catalytic activity of the resulting composites is due to synergetic effects between the constituents that increase electroactive sites, improve electronic and ionic conduction, and facilitate the transport of electrolyte ions to and from the electrode surface . Among metal sulfides, Co 3 S 4 is a promising and efficient active material that has attracted enormous attention in different applications due to its low cost, abundant valence states for electrochemical reactions, simple preparation method, good electrical conductivity, outstanding reversibility, and excellent catalytic behavior . However, most of the synthesis methods of metal (oxide) sulfides involve complex and time-consuming processes and require expensive instruments and strict reaction environments, which restrict large-scale production .…”