The Enhanced Pdaupt-Nitrogen Graphene/Ito Anode Electrodes for Electrooxidation of Glucose in Alkaline Medium

Abstract

The chemical vapor deposition (CVD) method was used to synthesize nitrogen-doped graphene (N-G). N-G coated on Cu foil via CVD method was transferred onto indium tin oxide (ITO). Finally, Pd, Au, and Pt metals were electrochemically doped on the N-G/ITO electrode surface. Surface properties and elemental composition ana-lyses were performed with the obtained electrodes by scanning electron microscope-energy dispersive X-ray (SEM-EDX) and mapping. The results of this analysis indicated that both N-doped G and metals were formed on the ITO surface. The catalytic activity, stability, and resistance of the electrodes for glucose (Glu) electro-oxidation were investigated by cyclic voltammetry (CV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS) analyses, respectively. The PdAuPt-N-G/ITO electrode exhibited a more active surface area and catalytic activity than the PdAu-N-G/ITO electrode, with a specific activity of 9.50 mA/cm2 and an electrochemical active surface area (ECSA) of 61.21 m2/g. In addition, CA and EIS analyses showed that it was more stable and has faster electron transfer with a lower Rct (143.5 omega) value. In the light of these results, it can be said that the obtained electrode is promising for glucose electrooxidation.