One-Step Synthesis of Pt-Nanoparticles-Laden Graphene Crumples by Aerosol Spray Pyrolysis and Evaluation of Their Electrocatalytic Activity

摘要

Pt-nanoparticles-laden graphene (GR) crumples were directly synthesized from a colloidal mixture of aqueous chloroplatinic acid (H2PtCl6) and graphene oxide (GO) sheets via aerosol spray pyrolysis (ASP). Effects of Pt content in the Pt/GR composite and temperature of heating zone on the particle morphology, diffraction pattern, and specific surface area were investigated. The morphology of Pt/GR was the shape of a crumpled sheet of paper and the average size of the composite was around 1.3 μm in diameter. As Pt content increased from 2 to 20 wt, higher numbers of Pt nanopar-ticles are observed on the GR at higher Pt content and the specific surface area of the composite also increased from 122 to 146 m~2/g. Also, the intensity of the GR peak decreased, but that of the Pt peak increased. As temperature increased from 500° C to 900° C, an increase of the particle size of Pt due to sintering was observed. Electrocatalytic application of the Pt/GR composites was examined through methanol oxidation reaction. The 20 wt Pt/GR synthesized at 900° C showed higher performance on methanol oxidation than a commercial 20 wt Pt/carbon black catalyst.