Stability of nanostructured silver-platinum alloys

JOURNAL OF ALLOYS AND COMPOUNDS

卷:770

Article

Wisniewska, Joanna^1,2  Guesmi, Hazar³  Ziolek, Maria¹  Tielens, Frederik² 

[1] Adam Mickiewicz Univ, Fac Chem, Umultowska 89b, PL-61614 Poznan, Poland

[2] Vrije Univ Brussel, Free Univ Brussels, Gen Chem ALGC, Pl Laan 2, B-1050 Brussels, Belgium

[3] UM, ENSCM, CNRS, Inst Charles Gerhardt Montpellier, 240 Ave Prof Emile Jeanbrau, F-34090 Montpellier, France

关键词: Silver;    Platinum;    Stability;    DFT;    XRD;    UV-Vis;   

DOI  :  10.1016/j.jallcom.2018.08.208

来源: Elsevier

【 摘 要 】

The stability of Ag-Pt systems: 13-atoms icosahedral cluster model (Ag13-nPtn) and 54-atoms (111) surface slab model (45Ag9Pt) have been systematically investigated by using Density Functional Theory within the generalized gradient approximation (DFT-GGA). Experimentally tested resistance of AgPt alloy nanoparticles supported on silica to decay upon temperature treatment (423 K-573 K in N-2 flow) have shown to correlate with theoretical results. The stability of the clusters as a function of AgPt composition decreases with increasing content of Pt. The general stability trend of the AgPt alloy was maintained, in theory and experiment, for the Ag/Pt molar ratio of 1.6-5.1. Two particularly stable Ag/Pt compositions were revealed: 1.6 and 0.4. It was also found that surface location of platinum is responsible for stabilization of the Ag-Pt nanostructured alloy. (C) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

Free