RuO 2 electrode surface effects in electrocatalytic oxidation of glucose

摘要: We have studied the electrocatalytic activity of RuO2-PVC film electrodes, fabricated using RuO2 powders prepared at five different temperatures, viz., 300, 400, 500, 600 and 700°C, for oxidation glucose in high alkaline media, 1 to 3 M NaOH. The electrodes been first characterized NaOH solution by cyclic voltammetry (CV) rotating disc electrode (RDE) techniques a wide potential range −1,100 450 mV (SCE), three redox pairs representing Ru(IV)/Ru(III), Ru(VI)/Ru(IV) Ru(VII)/Ru(VI) transitions identified. voltammetric peaks low sweep rates analyzed surface theory formulated interacting electroactive adsorption sites, interaction terms evaluated. total charges as per Trassatti’s formalism with respect their dependence on rate, associated less accessible more sites calculated. For oxidation, results indicated that (700°C)-PVC shows two contrast (300°C)-PVC electrode. Also, exhibits higher intrinsic than 300°C electrode, although former possesses lower electrochemically active area. Additionally, kinetic analyses made from RDE reference Michealis–Menten (MM) enzyme catalysis has shown (700°C) extended glucose-sensing MM constant, K M , compared other electrodes. Possible reasons such differences behavior temperatures towards are identified studies solutions pH, derivatives, also physicochemical BET, XRD, SEM, DTGA, XPS analysis powder samples.