Continuous-Flow Reactor Synthesis for Homogeneous 1 nm-Sized Extremely Small High-Entropy Alloy Nanoparticles

• DOI: 10.1021/jacs.2c02755
• Publication Date: 2022-06-24T17:29:35Z
• Authors: Hiroki Minamihara; Kohei Kusada; Dongshuang Wu; Tomokazu Yamamoto; Takaaki Toriyama; Syo Matsumura; Loku Singgapulige...; Koji Ohara; Osami Sakata; Shogo Kawaguchi; Yoshiki Kubota; Hiroshi Kitagawa
• Keywords: Overpotential; Continuous production

High-entropy alloy nanoparticles (HEA NPs) emerged as catalysts with superior performances that are not shown in monometallic catalysts. Although many kinds of synthesis techniques HEA NPs have been developed recently, synthesizing ultrasmall particle size and narrow distribution remains challenging because most the reported methods require high temperatures accelerate growth. This work provides a new methodology for fabrication homogeneous using continuous-flow reactor liquid-phase reduction method. We successfully synthesized IrPdPtRhRu (1.32 ± 0.41 nm), theoretically each consisting approximately 50 atoms. average is smallest ever NPs. All five elements homogeneously mixed at atomic level particle. The obtained marked significantly hydrogen evolution reaction (HER) activity very small 6 mV overpotential 10 mA/cm-2 acid, which one-third commercial Pt/C. In addition, although mass production still difficult, this flow can provide productivity reproducibility, more energy efficient suitable production. Therefore, study reports 1 nm-sized remarkably HER establishes platform