Autocatalytic Formation of High-Entropy Alloy Nanoparticles.
Angew Chem Int Ed Engl
; 59(49): 21920-21924, 2020 Dec 01.
Article
en En
| MEDLINE
| ID: mdl-32820603
ABSTRACT
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. Inâ
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 °C for Pd to ca. 350 °C for Ir. However, for the mixture, homogenous Pt-Ir-Pd-Rh-Ru HEA nanoparticles can be obtained around 200 °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.
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MEDLINE
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En
Revista:
Angew Chem Int Ed Engl
Año:
2020
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Article
País de afiliación:
Dinamarca