Hydrothermal-assisted green synthesis of Ni/Ag@rGO nanocomposite using Punica granatum juice and electrochemical detection of ascorbic acid

• DOI: 10.1016/j.microc.2020.104850
• Publication Date: 2020-03-19T21:30:45Z
• Authors: Trupti R. Das; Prashant K. Sharma
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract In this paper, nickel and silver nanoparticle decorated on reduced graphene oxide (Ni/Ag@rGO) nanocomposite was synthesized using Punica granatum (pomegranate) juice. The synthesized Ni/Ag@rGO nanocomposite was successfully characterized by XRD, FTIR, FESEM, EDX, and HRTEM techniques. The electrochemical impedance spectroscopy (EIS) study of the Ni/Ag@rGO has shown a lower electrode resistance (30.0 Ohm). The electrocatalytic activity study shows that the Ni/Ag@rGO electrode has a greater electroactive area (0.149 cm2) and roughness factor (0.379). The Ni/Ag@rGO was applied for detecting ascorbic acid (AA) electrochemically, which revealed the linear range, limit of detection (LOD) and sensitivity of 4.89–90.09 µM, 0.16 µM, and 23,381.8 µA cm−2 mM−1, respectively. From the interference study, Ni/Ag@rGO electrode was found to be selective towards the detection of AA. The Ni/Ag@rGO electrode has shown excellent stability upto 45 days.