Quantitative Characterization of the Thermally Driven Alloying State in Ternary Ir-Pd-Ru Nanoparticles

Xuan Quy Tran, Kohei Aso, Tomokazu Yamamoto, Wenhui Yang, Yoshiki Kono, Kohei Kusada, Dongshuang Wu, Hiroshi Kitagawa, Syo Matsumura

研究成果: ジャーナルへの寄稿学術誌査読

抄録

Compositional and structural arrangements of constituent elements, especially those at the surface and near-surface layers, are known to greatly influence the catalytic performance of alloyed nanoparticles (NPs). Although much research effort often focuses on the ability to tailor these important aspects in the design stage, their stability under realistic operating conditions remains a major technical challenge. Here, the compositional stability and associated structural evolution of a ternary iridium-palladium-ruthenium (Ir-Pd-Ru) nanoalloy at elevated temperatures have been studied using interrupted in situ scanning transmission electron microscopy and theoretical modeling. The results are based on a combinatory approach of statistical sampling at the sub-nanometer scale for large groups of NPs as well as tracking individual NPs. We find that the solid solution Ir-Pd-Ru NPs (∼5.6 nm) evolved into a Pd-enriched shell supported on an alloyed Ir-Ru-rich core, most notably when the temperature exceeds 500 °C, concurrently with the development of expansive atomic strain in the outer surface and subsurface layers with respect to the core regions. Theoretically, we identify the weak interatomic bonds, low surface energy, and large atomic sizes associated with Pd as the key factors responsible for such observed features.

本文言語英語
ジャーナルACS nano
DOI
出版ステータス印刷中 - 2021

!!!All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 工学(全般)
  • 物理学および天文学(全般)

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