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Metal-support interaction controlled migration and coalescence of supported particles

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  • Special Topic: Current Progress in Solid Mechanics and Physical Mechanics
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Abstract

The particle migration and coalescence (PMC) kinetics of a supported metal are the main deactivation mechanisms restricting the successful industrialization of nanoparticles, but the theoretical insights regarding these kinetics are lacking. One key issue is the lack of a physical model to predict the effects of metal-support interaction (MSI) on PMC kinetics. In this paper, we report a theoretical study of PMC kinetics and their dependence on MSI. A new particle diffusion model is proposed based on the surface premelting hypothesis that considers the contact angle of a hemispherical particle on the support. Enhanced MSI suppresses PMC by increasing the radius of curvature and the interfacial adhesion energy, even though the accompanying reduction in the geometry factor partially promotes PMC kinetics. The increased surface energy increases the chemical potential of the atoms in the particle, which is conducive to PMC; an increased surface energy also results in enhanced MSI, which suppresses PMC. The competition between these two contradictory effects leads to a critical contact angle where the surface energy has no influence on the diffusion and resulting PMC kinetics. The proposed diffusion theory mode lincluding the effects of the support and the corresponding kinetic simulations, shed light onto the support-dependence of PMC kinetics and provide a foundation for further optimization and design of supported particles with better stability.

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  1. Department of Chemical Physics, School of Chemistry and Materials Science, iCHeM, CAS Excellence Center for Nanoscience, University of Science and Technology of China, Hefei, 230026, China

    SuLei Hu & Wei-Xue Li

  2. Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, 230026, China

    SuLei Hu & Wei-Xue Li

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Hu, S., Li, WX. Metal-support interaction controlled migration and coalescence of supported particles. Sci. China Technol. Sci. 62, 762–772 (2019). https://doi.org/10.1007/s11431-018-9407-3

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