Flexible Electrochemical Sensor for Hydrogen Peroxide Detection by Employing WO3/g-C3N4 Nanostructures

This paper describes the fabrication of WO3/g-C3N4 and use of a flexible carbon cloth (CC)-based nonenzymatic detection of hydrogen peroxide (H2O2). The WO3/g-C3N4 was prepared using a hydrothermal method and characterized using various techniques such as field emission scanning electron microscopy (FESEM), powder X-ray diffraction (PXRD), Fourier transform Infrared (FTIR), X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET) analysis. Further, the electrodes were fabricated using CC as a flexible and conductive support and was modified with different samples of WO3/g-C3N4 nanostructures (1-WO3/g-C3N4 and 2-WO3/g-C3N4). The electrochemical investigations revealed that the 1-WO3/g-C3N4/CC, and 2-WO3/g-C3N4/CC modified electrodes have strong electrocatalytic activity than WO3 towards the detection of H2O2, which can be attributed to the surface properties, conductivity and resultant interactions of WO3 and g-C3N4 in WO3/g-C3N4. Furthermore, the 1-WO3/g-C3N4/CC, and 2-WO3/g-C3N4/CC demonstrated a sensitivity of 78 mu A mM(-)1 cm(-2) and 59 mu A mM(-1) cm(-2), respectively, and were used to measure the concentration of H2O2 in the range of 0.003-0.03 mM. In addition, the LOD of the 1-WO3/g-C3N4/CC, and 2-WO3/g-C3N4/CC was estimated for the sensor as 2.07 mu M and 2.53 mu M, respectively. These findings suggest that the WO3/g-C3N4 with high conductivity and stability has a promising future in the development of electrochemical sensors. (c) 2023 The Electrochemical Society (ECS). Published on behalf of ECS by IOP Publishing Limited.

Automated summary

This paper describes the fabrication of WO3/g-C3N4 and its use in a flexible carbon cloth-based nonenzymatic detection of hydrogen peroxide (H2O2). The WO3/g-C3N4 was prepared using a hydrothermal method and characterized using various techniques. The electrode modified with WO3/g-C3N4 demonstrated strong electrocatalytic activity for the detection of H2O2, suggesting its potential in the development of electrochemical sensors.