Wu Zenan, Yang Guangxing, Liu Zhiting, Du Shengjun, Zhang Qiao, Peng Feng
School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, People's Republic of China.
Nano Lett. 2024 May 22. doi: 10.1021/acs.nanolett.4c00730.
High-entropy-alloy nanoparticles (HEA NPs) exhibit promising potential in various catalytic applications, yet a robust synthesis strategy has been elusive. Here, we introduce a straightforward and universal method, involving the microexplosion of Leidenfrost droplets housing carbon black and metal salt precursors, to fabricate PtRhPdIrRu HEA NPs with a size of ∼2.3 nm. The accumulated pressure within the Leidenfrost droplet triggers an intense explosion within milliseconds, propelling the carbon support and metal salt rapidly into the hot solvent through explosive force. The exceptionally quick temperature rise ensures the coreduction of metal salts, and the dilute local concentration of metal ions limits the final size of the HEA NPs. Additionally, the explosion process can be fine-tuned by selecting different solvents, enabling the harvesting of diverse HEA NPs with superior electrocatalytic activity for alcohol electrooxidation and hydrogen electrocatalysis compared to commercial Pt (Pd) unitary catalysts.
高熵合金纳米颗粒（HEA NPs）在各种催化应用中展现出了广阔的潜力，但一直缺乏一种稳健的合成策略。在此，我们介绍一种简单通用的方法，该方法涉及容纳炭黑和金属盐前驱体的莱顿弗罗斯特液滴的微爆炸，以制备尺寸约为2.3 nm的PtRhPdIrRu HEA NPs。莱顿弗罗斯特液滴内积累的压力在数毫秒内引发强烈爆炸，通过爆炸力将碳载体和金属盐迅速推进到热溶剂中。异常快速的温度上升确保了金属盐的共还原，并且金属离子的局部浓度稀释限制了HEA NPs的最终尺寸。此外，通过选择不同的溶剂可以对爆炸过程进行微调，与商业Pt（Pd）单一催化剂相比，能够获得对醇类电氧化和氢电催化具有优异电催化活性的多种HEA NPs。
