The deposition of Au–Pt core–shell nanoparticles on reduced graphene oxide and their catalytic activity

Abstract

Au-Pt core-shell nanoparticles have been synthesized on a reduced graphene oxide (RGO) surface by an under-potential deposition (UPD) redox replacement technique, which involves redox replacement of a copper UPD monolayer by PtCl₄²⁻ that could be reduced and deposited simultaneously. Scanning electron microscopy (SEM) and electrochemical methods have been used to characterize the graphene decorated with Au-Pt core-shell nanoparticles. The electrochemical experiments show that the materials exhibit excellent catalytic activity towards the oxygen reduction reaction and the methanol oxidation reaction. It is believed that the high-performance of this new catalyst is due to the ultrathin Pt shell on the Au nanoparticles surface and the oxygen-containing functional groups on the RGO surface.

A novel sensor based on electrodeposited Au–Pt bimetallic nano-clusters decorated on graphene oxide (GO)–electrochemically reduced GO for sensitive detection of dopamine and uric acid

“…Compared with other chemical methods to synthesize Pt/Au grappled on the GO [41][42], one-step electrodeposition of Pt-Au bimetallic nano-clusters loaded onto GO has not been reported, and electrochemical method owned the sufficient advantages, such as low cost, green and environmental protection, saving time and ease to control the experiment conditions.…”

“…Secondly, the literatures [39][40] indicate that excellent elctrocatalytic activity and high sensitivity of Pt can be enhanced by alloying with Au. The Pt-Au nanocomposites modified GO were reported in some literatures, which was synthesized by chemical reactions and then anchored onto GO by physical attentions [41][42]. Controlling the folding, crumpling and bending were the main problems in chemical functionalization of GO-based materials [43][44].…”

A Demonstration of Pt L3-Edge EXAFS Free from Au L3-Edge Using Log–Spiral Bent Crystal Laue Analyzers

“…A practical approach, combining different metals with Pt have widely been adopted to reduce the amount of Pt and improve its activity and durability. Among those, Au is one of the interesting metals due to its superior oxygen-reduction-reaction activity and durability reported in Pt-Au nanostructures, where the Pt (shell)-Au (core) structures and the effect of Au decoration on the edges of Pt surfaces are used as a fuel cell catalyst [1][2][3][4][5]. Hence, it is essential to understand the local structures of both Pt and Au in an atomic scale to elucidate the mechanism of the catalytic reactions in Pt-Au nanostructures.…”

One Pot Synthesis of Pt/Graphene Composite Using Polyamidoamine/Chitosan as a Template and Its Electrocatalysis for Methanol Oxidation

“…The Nyquist plots of EIS for Pt/GNs (PAMAM), Pt/GNs (CS), Pt/GNs and Pt/C in 1 M CH 3 OH + 0.5 M H 2 SO 4 solution at 0.5 V are shown in Figure 5C. The diameter of semicircle at high frequencies is a measure of charge transfer resistance related to the charge transfer reaction kinetics [47][48][49]. Obviously, the diameters of semicircle for Pt/GNs (PAMAM) and Pt/GNs (CS) are much lower than those of Pt/GNs and Pt/C, which demonstrates that Pt/GNs (PAMAM) and Pt/GNs (CS) have lower charge transfer resistance and faster reaction rate for MOR [50].…”