Size Control to a Sub-Nanometer Scale in Platinum Catalysts on Graphene

Abstract

Size controlled Pt catalysts supported by graphene nanosheets (GNS) are successfully prepared by changing the loading of Pt at 10−70 wt % using an impregnation method. It is found that Pt sub-nanoclusters (0.8 nm) with an extremely large surface area (170 m 2 g −1 ) are formed on the GNS support in a 10 wt % Pt/GNS catalyst. An increase in loading of Pt leads to an increase in the particle sizes of Pt, which results in lower activities for electrooxidation of adsorbed CO. A core level shift of Pt 4f in XPS indicates that Pt is chemically interacted with graphene. The modification of catalytic properties and the electronic structure is ascribed to the interface interaction between Pt and graphene via π−d hybridization.

Enhancement of Platinum Mass Activity on the Surface of Polymer-wrapped Carbon Nanotube-Based Fuel Cell Electrocatalysts

“…4c. A similar shift of the Pt 4f peak towards a higher binding energy was also reported for small Pt clusters and this upshift has been attributed to the increase in the number of Pt atoms with low coordination numbers223334.…”

Growth morphology and properties of metals on graphene

“…For example, due to its high surface area and low manufacturing cost, graphene has been used as substrate for surface-supported catalysis. Graphene-supported nanocatalysis with Pt [150][151][152][153], Pd [154], Au [155,156], and metal alloys [157][158][159][160][161][162] has been reported. The thermal stability of transition and noble metal nanostructures on graphene is crucial for the performance of the catalysis applications.…”

Size control and supporting of palladium nanoparticles made by laser ablation in saline solution as a facile route to heterogeneous catalysts

“…9. It is shown that the main peaks related to Pd 0 do not change significantly after adsorption on support material, and noticed that the peak position can be influenced from different parameters such as support material (due to electronic interactions) and nanoparticle size [55][56][57]. Takasu et al reported a shift to lower binding energies when the particle size of Palladium nanoparticles deposited on SiO 2 was increased [58].…”