Research on creation of high-entropy alloy nanoparticles and their new catalytic function development

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K22082
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 27:Chemical engineering and related fields
• Research Institution: Osaka University
• Principal Investigator: Mori Kohsuke 大阪大学, 工学研究科, 准教授 (90423087)
• Project Period (FY): 2019-06-28 – 2022-03-31
• Keywords: ハイエントロピー合金 / ナノ粒子 / 触媒

Outline of Final Research Achievements

The facile fabrication of high-entropy alloy (HEA) nanoparticles (NPs) over conventional catalyst supports remains challenging. We demonstrate that titanium dioxide (TiO2) is a promising platform for the low-temperature synthesis of supported CoNiCuRuPd HEA NPs at 400 °C. This process is driven by the hydrogen spillover effect on TiO2. The CoNiCuRuPd HEA NPs on TiO2 produced were found to be both active and extremely durable during the CO2 hydrogenation reaction. Characterization by means of various in situ techniques and theoretical calculations elucidated that cocktail effect and sluggish diffusion originating from the synergistic effect obtained by this combination of elements.

Free Research Field

触媒科学

Academic Significance and Societal Importance of the Research Achievements

本研究で開発した担持合金ナノ粒子は、調製が極めて簡便である、過酷な環境下においても安定性が高く分離・回収の容易な粉末状であるなど、実用化触媒に不可欠な基盤要素を兼ね備えている。また、CO2資源化反応において、単一金属から成る既存の触媒より数倍優れた性能を示した。さらに本研究では、カクテル効果、遅い拡散効果が、触媒活性やナノ粒子の構造安定性に起因していることを、理論計算を用いて証明しており学術的な意義も極めて高い。