【公開日：2024.07.25】【最終更新日：2024.06.26】

課題データ / Project Data

課題番号 / Project Issue Number

23AE0023

利用課題名 / Title

In-situ XAFS study of Ru based bimetallic solid solution alloy nanoparticles with controlled fcc and hcp structures under CO oxidation conditions

利用した実施機関 / Support Institute

日本原子力研究開発機構 / JAEA

機関外・機関内の利用 / External or Internal Use

外部利用/External Use

技術領域 / Technology Area

【横断技術領域 / Cross-Technology Area】（主 / Main）計測・分析/Advanced Characterization（副 / Sub）-

【重要技術領域 / Important Technology Area】（主 / Main）革新的なエネルギー変換を可能とするマテリアル/Materials enabling innovative energy conversion（副 / Sub）-

キーワード / Keywords

XAFS, solid-solution alloy, CO oxidation, catalysts

利用者と利用形態 / User and Support Type

利用者名（課題申請者）/ User Name (Project Applicant)

Wu Dongshuang

所属名 / Affiliation

Nanyang Technological University

共同利用者氏名 / Names of Collaborators in Other Institutes Than Hub and Spoke Institutes

O. Seo,O. Sakata,J. Tang, Y. Wang, H. Gu

ARIM実施機関支援担当者 / Names of Collaborators in The Hub and Spoke Institutes

松村　大樹

利用形態 / Support Type

（主 / Main）共同研究/Joint Research（副 / Sub）-

利用した主な設備 / Equipment Used in This Project

AE-006：エネルギー分散型XAFS装置

報告書データ / Report

概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)

Platinum-group metal (PGM) catalysts are invaluable to many important applications. How to further improve the catalytic activity has been a key issue due to its high cost and rare reserves. As a design for the cost-effective and high-performance catalysts of PGM catalysts, a method of doping with nonprecious elements is widely used. Ruthenium, nickel and cobalt are significant catalysts for many catalytic reactions. In particular, studies on the CO oxidation performance of Ru, Co and Ni nanoparticles and the surface reaction mechanism of single crystal have been widely investigated. The purpose of this beam time is to observe the electronic structure change of metal alloy nanoparticles during the gas atmosphere.

実験 / Experimental

First, we observed the ex situ XAFS of the samples in the pellet form. For the in situ measurement, focusing on the In, Co, Cu, Fe, Ni, Pd K-edges, the samples were pressurized and fitted into the in situ holder provided by Dr. Matsumura. The XAFS spectra were obtained under different atmospheres including vacuum, H₂ (1 bar), CO₂ (1 bar) with varying temperatures (RT to 773 K).

結果と考察 / Results and Discussion

During this beamtime, we have confirmed that all the liquid metal-based nanoparticles are covered by metal oxide layers on their surfaces. The thickness of the surface oxide layers is highly dependent on the particle size. Small NPs have thicker layers. We have also observed Ni metal and In₂O₃ nanoparticle samples under in situ condition of CO₂ and H₂ atmospheres at various temperatures. We have found some structural change of these nanoparticles and Fe and Co nanoparticles under some gaseous conditions. Detailed analysis will be operated in order to understand correlations between structure of nanoparticles and catalysis.

図・表・数式 / Figures, Tables and Equations

その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)

成果発表・成果利用 / Publication and Patents

論文・プロシーディング（DOIのあるもの） / DOI (Publication and Proceedings)

口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.

特許 / Patents

特許出願件数 / Number of Patent Applications：0件
特許登録件数 / Number of Registered Patents：0件