Structural stability of AgCu bimetallic nanoparticles and their application as a catalyst: A DFT study

• Published in: Catalysis today Vol. 185; no. 1; pp. 94 - 98
• Main Authors: Shin, Kihyun, Kim, Da Hye, Yeo, Sang Chul, Lee, Hyuck Mo
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 20.05.2012; Elsevier
• Subjects: adsorption; AgCu bimetallic nanoparticle; alloys; Catalysis; catalytic activity; Chemistry; Colloidal state and disperse state; Density functional theory; dissociation; energy; Exact sciences and technology; General and physical chemistry; isomers; nanoparticles; oxygen; Oxygen reduction reaction; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Structural stability; Surface physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; AgCu bimetallic nanoparticle; Density functional theory; Structural stability; Oxygen reduction reaction; Oxygen; Adsorption energy; Stability; Nanoparticle; Alloys; Isomer; Chemical reduction; Heterogeneous catalysis; Adsorption; Transition state; Density functional method; Calculation; Dissociation; Structure; Catalyst; Surface energy
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2011.09.022

[Display omitted] ► We prepared Ag13, Cu13, Ag12Cu1 (core–shell), and Ag12Cu1 (alloy) nanoparticles. ► We calculated structural stability and catalytic property for each system. ► Ag12Cu1 (alloy) can be a good candidate for oxygen reduction reaction catalyst. Density functional theory (DFT) calculations confirm the structural stability of isomers for 13-atom Ag, Cu, and AgCu nanoparticles. Ag13 and Cu13 nanoparticles have a different stable structure because of the quantum effect and differences in surface energy. We systematically studied the oxygen reduction reaction (ORR) of Ag13, Cu13, Ag12Cu1 (core–shell) and Ag12Cu1 (alloy) nanoparticles by investigating the adsorption property of O2 and the transition state calculations of O2 dissociation, which determine the ORR rate. An Ag alloy with Cu has the high adsorption energy and a low energy barrier. It also exhibits the high structural stability during the reaction.