纳米材料基催化剂
自催化
合金
纳米颗粒
材料科学
化学工程
透射电子显微镜
催化作用
微晶
金属
溶剂热合成
纳米技术
化学
冶金
有机化学
工程类
作者
Nils Lau Nyborg Broge,Martin Bondesgaard,Frederik Søndergaard‐Pedersen,Martin Roelsgaard,Bo B. Iversen
标识
DOI:10.1002/anie.202009002
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 °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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