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Morphology control of metallic nanoparticles supported on carbon substrates in catalytic conditions

Abstract : Metallic nanoparticles are highly reactive objects, often used for their catalytic properties which strongly depend on their shape and morphology. Here we show that controlling the wetting properties on a substrate enables one to control the nanoparticle's shape, prevent their coalescence and maximize their surface reactivity. The highly ordered mesoporous carbon structures (Carbon Mesoporous KAIST) are ideal to achieve such a control. The porous structures of the CMK can be tuned during their synthesis and display convex and concave surfaces capable of modifying the wetting properties and the morphology of the nanoparti-cles incorporated. R2.1 On a concave substrate, the nanoparticle tends to spread on the surface of the substrate resulting in a platelet particle shape, while on flat or convex ones the nanoparticle shows a limited wetting behavior corresponding to a spherical shape. In addition, the carbon enrichment of the metallic nanoparticles in contact with CMK plays a key role in controlling their equilibrium morphology. This atomic scale study allows us to better understand the interaction between metal nanoparticles and ⇤ CMK in order to control their morphology and improve their reactivity.
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Submitted on : Wednesday, August 5, 2020 - 2:41:12 PM
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Yann Magnin, Emmanuel Villermaux, Hakim Amara, Christophe Bichara, Roland Pellenq. Morphology control of metallic nanoparticles supported on carbon substrates in catalytic conditions. Carbon, Elsevier, 2020, 159, pp.504-511. ⟨10.1016/j.carbon.2019.12.025⟩. ⟨hal-02426040⟩



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