Correlation between crystallinity description parameters of nanoparticles and catalytic activity

2022 Fiscal Year Final Research Report

• Project/Area Number: 18K04868
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 28010:Nanometer-scale chemistry-related
• Research Institution: Japan Synchrotron Radiation Research Institute (2021-2022); National Institute for Materials Science (2018-2020)
• Principal Investigator: Sakata Osami 公益財団法人高輝度光科学研究センター, 放射光利用研究基盤センター, 副センター長 (40215629)
• Project Period (FY): 2018-04-01 – 2023-03-31
• Keywords: 局所原子配列 / Pd基ナノ合金 / シンクロトロンX線解析 / X線回折 / X線吸収微細構造(XAFS) / 局所構造秩序度 / 固溶体合金ナノ粒子 / 硬X線光電子分光

Outline of Final Research Achievements

The local atomic and electronic structures of metal (Pd, PdPt, Rh, AgRh, etc.) nanoparticles (NPs) were analyzed in relation to their hydrogen storage properties using synchrotron X rays. As stated in the objective, the crystallinity of PdPt solid solution NPs could be evaluated using crystallinity descriptive parameters (bond orientation order, which is the degree of local structural order, and solid solution) (e.g., solid solution order decreases with increasing Pt content). In addition, the electronic structure of Ru NPs and the atomic arrangement structure of Ir-doped PdRu NPs were also investigated. The methods utilized were diffraction, X-ray absorption fine structure, high-energy X-ray total scattering, Rietveld analysis, reverse Monte Carlo modeling, and hard X-ray photoemission spectroscopy.

Free Research Field

放射光ナノ構造科学

Academic Significance and Societal Importance of the Research Achievements

調べた合金ナノ粒子は今後産業に応用が展開できると期待される重要な材料である。本研究で得られた、局所原子配列構造や電子構造の定量的な知見は、その材料の機能と関連させて、材料創製にフィードバックし、材料開発を促進できる点で意義がある。