Electrochemical analysis of monoethylene glycol using rGO/AuPd-np-modified glassy carbon electrode

An electrode for monoethylene glycol analysis was developed based on the modification of the surface of the glassy carbon electrode with electrochemically reduced graphene oxide and gold and palladium nanoparticles (GCE/rGO/AuPd-np). Its analytical performance was assessed by determining some analytical figures of merit. Graphene oxide was reduced electrochemically as well as the metal particles with gold deposited by chronopotentiometry and palladium by cyclic voltammetry (CV). The electrode was characterized by MET, TEM and EDS techniques. The study of alcohol behaviour was performed electrochemically using CV technique. The positive synergistic effect of metals provided greater electrocatalytic response, stability and resistance to poisoning. The GCE/rGO/AuPd-np sensor presented a detection limit equal to 31.48 µmol l–1 for a linear range of 89.5–179 µmol l–1 with a linear correlation coefficient of 0.9096 and high stability, not losing response even after 650 cycles.