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...
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | , , , , , , , , |
| Published: |
2025
|
| Subjects: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | 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. |
|---|