Autocatalytic Formation of High-Entropy Alloy Nanoparticles

被引：90
作者：
Broge, Nils L. N. [1 ,2 ]
Bondesgaard, Martin [1 ,2 ]
Sondergaard-Pedersen, Frederik [1 ,2 ]
Roelsgaard, Martin [1 ,2 ]
Iversen, Bo Brummerstedt [1 ,2 ]
机构：
[1] Aarhus Univ, Dept Chem, Ctr Mat Crystallog, DK-8000 Aarhus C, Denmark
[2] Aarhus Univ, iNANO, DK-8000 Aarhus C, Denmark
来源：
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2020年 / 59卷 / 49期
关键词：
alloys; autocatalysis; nanocatalysts; nanoparticles; X-ray scattering; HYDROGEN STORAGE; CATALYSIS; GROWTH;
D O I：
10.1002/anie.202009002
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
High-entropy alloy (HEA) nanoparticles hold great promise as tunable catalysts. Despite the fact that alloy formation is typically difficult in oxygen-rich environments, we found that Pt-Ir-Pd-Rh-Ru nanoparticles can be synthesized under benign low-temperature solvothermal conditions. In situ X-ray scattering and transmission electron microscopy reveal the solvothermal formation mechanism of Pt-Ir-Pd-Rh-Ru nanoparticles. For the individual metal acetylacetonate precursors, formation of single metal nanoparticles takes place at temperatures spanning from ca. 150 degrees C for Pd to ca. 350 degrees C for Ir. However, for the mixture, homogenous Pt-Ir-Pd-Rh-Ru HEA nanoparticles can be obtained around 200 degrees C due to autocatalyzed metal reduction at the (111) facets of the forming crystallites. The autocatalytic formation mechanism suggests that many types of HEA nanocatalysts should accessible with scalable solvothermal reactions, thereby providing broad availability and tunability.
引用
收藏
页码：21920 / 21924
页数：5
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