High Electrocatalytic Activity of the Pt-Based Catalyst Supported on Carbon Prepared Using a Plasma Torch and Natural Gas

Wednesday, 27 May 2015
Salon C (Hilton Chicago)
J. Ribeiro, T. C. S. Evangelista, and G. T. Paganoto (Federal University of Espírito Santo)
Physicochemical and electrochemical characterisations of Pt-based electrocatalysts supported on carbon (Vulcan® XC72, C1 and carbon produced using a plasma torch from natural gas vehicles, C2) toward ethanol electrooxidation were investigated. The Pt/C1 and Pt/C2 electrocatalysts were prepared by thermal decomposition of polymeric precursors at 350 ° C. The electrochemical and physicochemical characterisations of the electrocatalysts were performed by means of X-ray diffraction (XRD), Raman scattering, cyclic voltammetry and chronoamperometry tests. The XRD results show that the Pt-based electrocatalysts present platinum metallic which is face-centered cubic structure. The results indicate that the Pt/C1 electrocatalyst has a smaller particle size (10.1 – 6.9) compared with the Pt/C2 electrocatalyst; however, the Pt/C2 particle sizes are similar (12.8 – 10.4 nm) and almost independent of the reflection planes, which suggests that the Pt crystallites grow with a radial shape. Raman results showed that all the materials are composed of randomly oriented structural units varying from 50 to 80 Å in size. Cyclic voltammetry and chronoamperometry data obtained in this study indicate that the deposition of Pt on carbon plasma increases its electrocatalytic activity toward ethanol oxidation.