Oscillating Dynamics of Migrating Cu–Pd Bimetallic Particles in the Catalytic Redox Reaction
Increasing evidence from <i>in situ</i> investigations discloses that nanoparticles (NPs) undergo reconstruction and migration during catalytic redox reactions. Insights into the driving mechanism are significant but remain rare for understanding NP-localized reaction kinetics while atte...
محفوظ في:
| المؤلف الرئيسي: | |
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| مؤلفون آخرون: | , , , , , , , , |
| منشور في: |
2025
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| الموضوعات: | |
| الوسوم: |
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| الملخص: | Increasing evidence from <i>in situ</i> investigations discloses that nanoparticles (NPs) undergo reconstruction and migration during catalytic redox reactions. Insights into the driving mechanism are significant but remain rare for understanding NP-localized reaction kinetics while attenuating catalyst coarsening. Herein, tracking the restructuring of Cu–Pd bimetallic NPs in a redox atmosphere through environmental transmission electron microscopy, we unraveled non-equilibrium oscillating dynamics facilitating the continuous migration of a tadpole-like Cu<sub><i>x</i></sub>Pd/Cu<sub>2</sub>O nanostructure. The spatially asymmetric distribution of Cu–Pd bimetallic and Cu<sub>2</sub>O phases within individual NP dictates its movement under the driving force of the copper redox reaction. Time-resolved microstructure tracking revealed that this oscillation was caused by the asynchronous diffusion of H<sub>2</sub>/O<sub>2</sub> reactants. <i>In situ</i> microscopy results further evidenced that the oscillatory migration starts from the oxidation of Cu atoms into Cu<sub>2</sub>O at low-coordinated corner sites of the Cu–Pd NP. This work comprehends the mechanism of widely observed catalytic NP oscillation and migration, which inspires an in-depth understanding of the intrinsic nature of NP migration coarsening. |
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