Enhanced Electrocatalytic Activity of Pt Particles Supported on Reduced Graphene Oxide/Poly(3,4‐ethylenedioxythiophene) RGO/PEDOT Composite towards Ethanol Oxidation

Abstract

Catalysts in fuel cells are normally platinum based because platinum exhibits high electrocatalytic activity towards ethanol oxidation in acidic medium. However, bulk Pt is expensive and rare in nature. To reduce the consumption of Pt, a support material or matrix is needed to disperse Pt on its surface as micro- or nanoparticles with potential application as anode material in direct ethanol fuel cells (DEFCs). In this study, a composite material consisting of platinum particles dispersed on reduced graphene oxide/poly(3,4-ethylenedioxythiophene) (RGO/PEDOT) support was electrochemically prepared for ethanol oxidation in sulfuric acid electrolyte. PEDOT, a conductive polymer, was potentiodynamically polymerized from the corresponding monomer, 0.10 M EDOT in 0.10 M HClO4electrolyte. The PEDOT-modified electrode was used as a substrate for exfoliated graphene oxide (EGO) which was prepared by electrochemical exfoliation of graphite from carbon rod of spent batteries and subsequently reduced to form RGO. The Pt/RGO/PEDOT composite gave the highest electrocatalytic activity with an anodic current density of 2688.7 mA·cm−2at E = 0.70 V (versus Ag/AgCl) towards ethanol oxidation compared to bare Pt electrode and other composites. Scanning electron microscopy (SEM) revealed the surface morphology of the hybrid composites while energy dispersive X-ray (EDX) confirmed the presence of all the elements for the Pt/RGO/PEDOT composite.

Enhancement effect of reduced graphene oxide and silver nanocomposite supported on poly brilliant blue platform for ultra-trace voltammetric analysis of rosuvastatin in tablets and human plasma

“…This decline in the electrical response conrms the signicance of rGO as a conducting element providing an excellent charge transfer between the presented layers. 36 Optimization of the inner poly brilliant blue layer (PBB). As the thickness of the polymer layer affects the electro-catalytic activity of the modied electrode, the optimal conditions of BB polymer growth on the modied electrode were investigated.…”

Tailoring the Electrochemical and Morphological Properties of Electropolymerized and Dropcast Reduced Graphene Oxide-Poly(3,4-ethylene dioxythiophene):polystyrenesulfonate Transducers for Ion-Selective Sensors

“…During electropolymerization, GO can be incorporated into the positively charged PEDOT matrix because of the polar hydroxyl and epoxy groups, thus making the GO surface negatively charged. At present, the electropolymerization of rGO-PEDOT:PSS composite has been done with two-step processes, either by doing electropolymerization on the rGO surface [32], or by reducing GO to rGO electrochemically on top of the electropolymerized PEDOT layer [33].…”