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

Abstract

Pt-nanoparticles-laden graphene (GR) crumples were directly synthesized from a colloidal mixture of aqueous chloroplatinic acid (H 2 PtCl 6 ) 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 nanoparticles 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.

Three-dimensional crumpled graphene-based platinum–gold alloy nanoparticle composites as superior electrocatalysts for direct methanol fuel cells

“…Hence, the ratio (I f /I b ) indicates the catalyst's tolerance to carbonaceous species accumulation. A higher I f /I b ratio indicates a higher tolerance to intermediate carbon species, and thus, methanol can be oxidized to carbon dioxide more efficiently [25,39].…”

“…In our earlier works [22][23][24][25][26][27], it was demonstrated that GRbased composites with a three-dimensional (3D) morphology had a high free volume and compressive strength [22,24,27]. In addition, they could be tightly packed without significantly decreasing the accessible surface area, unlike the 2D GRbased sheets [25][26][27].…”

“…In addition, they could be tightly packed without significantly decreasing the accessible surface area, unlike the 2D GRbased sheets [25][26][27]. The fabricated 3D GR-based composites could also deliver significantly higher electron transfers and electrical conductivity in the electrocatalyst performance [24].…”

Synthesis of micron-sized porous CeO2SiO2 composite particles for ultraviolet absorption

“…The aerosol process is a very rapid process when used to prepare porous composite particles from the sprayed droplets of a colloidal mixture [22]. This method has been widely used due to its many advantages, including the fact that it is a simple system that is also cost effectiveness, and the fact that it can be scaled up to quantities in the tons [23][24][25]. The effects of the precursor contents on particle properties such as the morphology, specific surface area, and pore size distribution were examined.…”

Aerosol Processing of Graphene and Its Application to Oil Absorbent and Glucose Biosensor

“…On the other hand, the ASP has many advantages in fabricating of crumpled GR from GO because it is a very fast, simple and continuous process for fabricating self assembled composites as a one-step method 41) . It also takes a very short time of several seconds for crumpling and reducing of GO together and does not require any post heat treatment, purification or reduction agents 23,[41][42][43] . The size of the crumpled particles and the degree of crumpling can be tuned with the concentration of GO in the aerosol droplets.…”