Impact of the AuAg NPs Composition on Their Structure and Properties: A Theoretical and Experimental Investigation

Abstract

Bimetallic AuAg NPs (NPs) were synthesized via chemical reduction of AuCl 3 and AgNO 3 and fully characterized by several experimental techniques and theoretical calculations. The plasmon absorptions of these NPs were correlated with the most stable particle structure through different simulations, revealing the most stable structure to be consisted of a gold core and a silver shell. This structural motif was then confirmed by HR-TEM coupled with line-scan EDS and molecular dynamics. Finally, the impact of the nanoparticle composition on their catalytic performance for glycerol electro-oxidation was evaluated. The better catalytic performance in terms of the onset potential found for the Au 50 Ag 50 and Au 75 Ag 25 catalysts suggests the existence of a synergistic effect between Au and Ag.

Advances in Electrocatalysis for Energy Conversion and Synthesis of Organic Molecules

“…This experimental high‐throughput screening of electrocatalytic materials enables optimizing the synthesis conditions. In 2014, Gomes et al . utilized the molecular dynamics (MD) to screen AuAg NPs for glycerol electrooxidation purposes so that the development of electrode materials can be closely tied to the optimal point.…”

New insights into the formation mechanism of Ag, Au and AgAu nanoparticles in aqueous alkaline media: alkoxides from alcohols, aldehydes and ketones as universal reducing agents

“…7 with those of reference samples (SI 3 in the supporting information), the oxidation product is probably oxalic acid in NaOH. 32 In order to investigate a possible oxidation of glycerol/NaOH over Ag-Nps, we prepared a suspension containing 3.6 mg of 10% wt. 31 We have shown that the formation of Ag-Nps passes through an induction period that corresponds to the first 15 s of reaction, followed by an exponential increase in the reaction velocity.…”

Tailoring gold and silver colloidal bimetallic nanoalloys towards SERS detection of rhodamine 6G

“…S1 †). 3,[47][48][49] The inset in Fig. 1 clearly shows different colors for the obtained colloidal AuAg and AgAu where the rst appears to be more similar to that of the Au colloid (reddish) and the latter appears more like the Ag one (yellowish).…”