PEDOT:PSS-Graphene-Nickel Nanoparticles Composite as Electro catalyst for urea oxidation

A facile two-step strategy was used to preparation Nano composite of reduced graphene oxide doped conducting polymer poly (3,4-ethylenedioxythiophene) decorated with nickelnanoparticles (NiNPs) onto a glassy carbon electrode (GCE). Composites of poly (3,4- ethylenedioxythiophene):poly (styrene sulfonate) (PEDOT:PSS) and reduced graphene oxide (RGO) have been prepared by solution mixing and have been fabricated as an beneficial supportfor Ni nanoparticles on a GCE. NiNPs were electrodeposited on PEDOT+RGO support by applying constant potential to nickel ions solutions. Then, NiNPs/PEDOT+RGO/GCE applied as efficient electro catalyst for electro oxidation of urea.The electro catalytic properties of NiNPs/PEDOT+RGO modified glassy carbon electrode toward the oxidation of urea were analyzed by cyclic voltammetry (CV) andchronoamperometry (CA). Cyclic voltammograms indicated the high electro catalytic activity of NiNPs/PEDOT+RGO is mainly described to the good electrochemical activity of PEDOT+RGO composites and the well-dispersed Ni nanoparticles on the surface of PEDOT+RGO composite.Images of scanning electron microscope also was used to checking the changes on the surface of the electrode after modification. The composite exhibits a good stability after 1000 s and causes a noticeable intensification electrochemical effective surface area of modified electrode. Theelectrochemical effective surface area of four modes of electrode including the bare GCE, NiNPs/PEDOT/GCE, PEDOT+RGO/GCE and NiNPs/PEDOT+RGO/GCE were calculated 0.28, 0.71, 0.81, 0.98 Cm2 respectively.

Keywords:

Poly (3 , 4-ethylenedioxythiophene) , Reduced graphene oxide , Nickel nanoparticles , Electro catalyst , Urea