Construction of carbon cloth modified-Al2O3-g-C3N4 sensor for non-enzymatic electrochemical detection of hydrogen peroxide

In light of the environmental hazards, we present pure alumina (Al2O3) and alumina-modified with graphitic- carbon nitride (Al2O3/g-C3N4) based-functional materials for non-enzymatic electrochemical sensing of hydrogen peroxide (H2O2). The synthesis of Al2O3 and Al2O3/g-C3N4 was carried out using a hydrothermal approach. The as-prepared-Al2O3 and Al2O3/g-C3N4 were characterized using the using PXRD, FT-IR, BET, XPS, and SEM-EDX. Further, Al2O3 and Al2O3/g-C3N4 were used as a modifier for the development of the sensor. Carbon cloth (CC) was employed as a three-dimensional (3D) conductive support and modified with Al2O3 and Al2O3/g-C3N4 for the development of flexible sensors (Al2O3/CC and Al2O3/g-C3N4/CC). We have used a simple drop-cast strategy to fabricate the electrodes. The present combination can provide a good surface area, high conductivity, and would have been a sensor of flexible category. The Al2O3/CC as a sensor for the detection of hydrogen peroxide (H2O2) has afforded the limit of detection as 1.1 * 10-4 M with the sensitivity of 58 mu A mM-1 cm-2, however, the Al2O3/g-C3N4/CC has presented the limit of detection as 1.6 * 10-4 M with good sensitivity of 108 mu A mM-1 cm- 2.The developed sensor demonstrated exceptional response for nonenzymatic detection of H2O2. As a result, the current study emphasizes the use of Al2O3/CC and Al2O3/g-C3N4/CC as a sensing platform for toxic/hazardous chemicals, and it may be an important material for other applications related to energy and environment.

Automated summary

In this study, pure alumina and alumina modified with graphitic carbon nitride were synthesized and used for non-enzymatic electrochemical sensing of hydrogen peroxide. The developed sensors, namely Al2O3/CC and Al2O3/g-C3N4/CC, exhibited high sensitivity and good detection limits for hydrogen peroxide. These sensors hold great potential for applications in energy and environmental fields.