Atomic-Scale Behavior of Perovskite-Supported Ir-Pd-Ru Nanoparticles under Redox Atmospheres

被引：0

作者：

Tran, Xuan Quy ^{[1
]}

Yamamoto, Tomokazu ^{[1
,2
]}

Aso, Kohei ^{[1
,3
]}

Yoshioka, Satoru ^{[1
]}

Kusada, Kohei ^{[4
,5
]}

Kitagawa, Hiroshi ^{[4
]}

Haneda, Masaaki ^{[6
,7
]}

Kawami, Youichirou ^{[1
,2
]}

Matsumura, Syo ^{[1
,2
]}

机构：

[1] Kyushu Univ, Dept Appl Quantum Phys & Nucl Engn, Fukuoka 8190395, Japan

[2] Kyushu Univ, Ultramicroscopy Res Ctr, Fukuoka 8190395, Japan

[3] Japan Adv Inst Sci & Technol, Sch Mat Sci, Nomi, Ishikawa 9231292, Japan

[4] Kyoto Univ, Grad Sch Sci, Div Chem, Sakyo Ku, Kyoto 6068502, Japan

[5] Kyoto Univ, Hakubi Ctr Adv Res, Sakyo Ku, Kyoto 6068502, Japan

[6] Nagoya Inst Technol, Adv Ceram Res Ctr, Gifu 5070071, Japan

[7] Nagoya Inst Technol, Frontier Res Inst Mat Sci, Nagoya, Nagoya 4658555, Japan

来源：

NANO LETTERS | 2024年 / 24卷 / 35期

基金：

日本科学技术振兴机构;

关键词：

self-regenerating catalyst; three-way catalyst; in situ gas-cell electron microscopy; atomicXEDS mapping; Ir-Pd-Ru; LaFeO3; exsolution; SELF-REGENERATION; CATALYSTS; INSIGHT;

D O I：

10.1021/acs.nanolett.4c03356

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

An advanced materials solution utilizing the concept of "smart catalysts" could be a game changer for today's automotive emission control technology, enabling the efficient use of precious metals via their two-way switching between metallic nanoparticle forms and ionic states in the host perovskite lattice as a result of the cyclical oxidizing/reducing atmospheres. However, direct evidence for such processes remains scarce; therefore, the underlying mechanism has been an unsettled debate. Here, we use advanced scanning transmission electron microscopy to reveal the atomic-scale behaviors for a LaFe0.95Pd0.05O3-supported Ir-Pd-Ru nanocatalyst under fluctuating redox conditions, thereby proving the reversible dissolution/exsolution for Ir and Ru but with a limited occurrence for Pd. Despite such selective dissolution during oxidation, all three elements remain cooperatively alloyed in the subsequent reduction, which is a key factor in preserving the catalytic activity of the ternary nanoalloy while displaying its self-regenerating functionality and control of particle agglomeration.

引用

页码：11108 / 11115

页数：8

共 2 条

[1] Temperature and magnetic field dependent behavior of atomic-scale skyrmions in Pd/Fe/Ir(111) nanoislands
Lindner, P.
Bargsten, L.
Kovarik, S.
Friedlein, J.
Harm, J.
Krause, S.
Wiesendanger, R.
[J]. PHYSICAL REVIEW B, 2020, 101 (21)
[2] The Thermal Stability of Asymmetric Separated Configurations inside Alloy Nanoparticles: Atomic-Scale Modeling of Pd-Ir Nanophase Diagrams
Polak, Micha
Rubinovich, Leonid
[J]. ACS NANO, 2022, 16 (12) : 20186 - 20196

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