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<p>The crystal phase of metal nanocatalysts plays a critical role in determining their catalytic performance, yet the atomic-scale mechanisms underlying their phase-dependent reactivity remain poorly understood. Here, using operando gas-cell transmission electron microscopy (TEM), we directly correlate the crystal structures of Ru nanoparticles (NPs) with their catalytic behavior during CO oxidation. We find that face-centered cubic (fcc) Ru exhibits high catalytic activity and structural stability, whereas hexagonal close-packed (hcp) Ru deactivates rapidly because of its pronounced susceptibility to oxidation. Furthermore, the transformation of fcc Ru NPs to hcp phase results in a marked loss of catalytic activity, underscoring the detrimental impact of phase instability under reaction conditions. These findings highlight the importance of direct observation of catalysts in reactive environments and provide mechanistic insights crucial for the rational design of phase-engineered nanocatalysts.</p>

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Revealing Phase-Dependent Catalytic Behavior of Ru Nanoparticles via Operando TEM

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月25日

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  • Yingying Jiang,
  • Juan Manuel Arce-Ramos,
  • Khakimjon Saidov,
  • Jia Zhang,
  • Chi Wang,
  • Jinshu Tian,
  • Jinling Cheng,
  • Xiangwen Liu,
  • Teck Leong Tan,
  • Utkur Mirsaidov

摘要

The crystal phase of metal nanocatalysts plays a critical role in determining their catalytic performance, yet the atomic-scale mechanisms underlying their phase-dependent reactivity remain poorly understood. Here, using operando gas-cell transmission electron microscopy (TEM), we directly correlate the crystal structures of Ru nanoparticles (NPs) with their catalytic behavior during CO oxidation. We find that face-centered cubic (fcc) Ru exhibits high catalytic activity and structural stability, whereas hexagonal close-packed (hcp) Ru deactivates rapidly because of its pronounced susceptibility to oxidation. Furthermore, the transformation of fcc Ru NPs to hcp phase results in a marked loss of catalytic activity, underscoring the detrimental impact of phase instability under reaction conditions. These findings highlight the importance of direct observation of catalysts in reactive environments and provide mechanistic insights crucial for the rational design of phase-engineered nanocatalysts.