Mustieles Marin Irene, Asensio Juan M, Chaudret Bruno
LPCNO, Université de Toulouse, CNRS, INSA, UPS, 135 avenue de Rangueil, 31077 Toulouse, France.
ACS Nano. 2021 Mar 23;15(3):3550-3556. doi: 10.1021/acsnano.0c09744. Epub 2021 Mar 4.
Bimetallic nanoparticles (NPs) are complex systems with properties that far exceed those of the individual constituents. In particular, association of a noble metal and a first-row transition metal are attracting increasing interest for applications in catalysis, electrocatalysis, and magnetism, among others. Such objects display a rich structural chemistry thanks to their ability to form intermetallic phases, random alloys, or core-shell species. However, under reaction conditions, the surface of these nanostructures may be modified due to migration, segregation, or isolation of single atoms, leading to the formation of original structures with enhanced catalytic activity. In this respect, Zakhtser report in this issue of the synthesis and study of the chemical evolution of the surface of a series of PtZn nanostructured alloys. In this Perspective, we report some selected examples of bimetallic nanocatalysts and their increased activity compared to that of the corresponding pure noble metal, with a special focus on Pt-based systems. We also discuss the mobility of the species present on the catalyst surface and the electronic influence of one metal to the other.
双金属纳米颗粒（NPs）是具有远超其各组成部分性质的复杂体系。特别是，贵金属与第一排过渡金属的结合在催化、电催化和磁性等应用方面正吸引着越来越多的关注。由于能够形成金属间相、随机合金或核壳物种，这类物质展现出丰富的结构化学。然而，在反应条件下，这些纳米结构的表面可能因单个原子的迁移、偏析或分离而发生改变，从而导致形成具有增强催化活性的原始结构。在这方面，扎赫采尔在本期报道了一系列PtZn纳米结构合金表面化学演化的合成与研究。在这篇综述中，我们报道了一些双金属纳米催化剂的精选实例，以及它们与相应纯贵金属相比提高的活性，特别关注基于Pt的体系。我们还讨论了催化剂表面存在的物种的迁移率以及一种金属对另一种金属的电子影响。
