Pt-Ni-Polyaniline@RGO is a highly stable and active catalyst for application in ascorbic acid electrochemical sensor

Electrochemical sensors is one of the most high-powered methods used for the detection of dangerous reagents or for examining health matter. In this present study, A nanocomposite-modified electrode was fabricated as a catalyst application in electrochemical sensor to determine ascorbic acid (AA). Hydrothermal and in situ polymerization methods have been used to fabricate Pt-Ni-Polyaniline@Reduced Graphene Oxide (Pt-Ni-PANi@RGO) nanocomposites. The Pt-Ni-PANi@RGO nano-composite properties were characterized with instrumental techniques XRD, SEM, TEM, EDX-mapping, FTIR and Raman. The results show that the carbon paste electrode modified with Pt-Ni-PANi@RGO had better catalytic properties compared with Pt-PANi@RGO and CPE, which was due to the fast electron transfer of the Pt-Ni-PANi@RGO nano-composite. To investigate and optimize the performance of the electrochemical catalyst designed for AA measurement, electrochemical methods such as cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used. Considering the optimal conditions, with ascorbic acid concentration in the range of 0.1 to 250 μM, the DPV peak current was linear with a detection limit of 0.03 μM. The results showed that the proposed catalyst has acceptable stability and repeatability for AA detection. Furthermore, the higher conductivity and good electrocatalytic performance of Pt-Ni-PANi@RGO make it a desirable material for sustainable energy generation and environmental protection without dependence on harmful chemicals.