Colloidal Ag@Pt Core–Shell Nanoparticles for the Catalytic Reduction of Nitrophenol - UFR de Chimie de Sorbonne-Université
Article Dans Une Revue ACS Applied Nano Materials Année : 2024

Colloidal Ag@Pt Core–Shell Nanoparticles for the Catalytic Reduction of Nitrophenol

Résumé

Bimetallic nanoparticles (NPs) composed of two metal elements have attracted much interest due to the possibility to synergistically enhance the catalytic performance of nanocatalysts. In this context, we have recently reported the seed mediated growth of bimetallic core-shell NPs combining a plasmonic metal Ag as a core and a catalytic metal Pt as a shell with a fine control of the core size and shell thickness. Here, we report a detailed study of the catalytic properties of our Ag@Pt core-shell NPs through a model reaction of reduction of 4-nitrophenol (4-NP) in 4-aminophenol (4-AP) in the presence of NaBH 4 , where the Pt shell thickness can be tuned from 1 to 6 atomic layers by adjusting the ratio of the Pt precursor to Ag seed concentration. First, we optimized the catalytic performances of pure Ag NPs by showing the role played by protons. We showed that the addition of an aqueous HCl or H 2 SO 4 solution improves the catalytic conversion rate due to the addition of H + . Furthermore, we showed that under light irradiation the presence of halide increases the catalytic efficiency of the Ag NPs by a photo-recycling of Ag and the generation of hot electrons. We then evidenced that the bimetallic system is more catalytically active than its monometallic counterparts, highlighting how the synergy between the two metals crucially depends on both the thickness of the Pt shell and the size of the Ag core. The best conditions were found with 4 Pt atomic layers, which is attributed to a favorable electronic coupling between Pt shell and Ag core. Nevertheless, the effect of the irradiation on the catalytic activity of Ag@Pt NPs remains moderate probably due to localized surface plasmon resonance damping by the Pt shell. Finally, the Ag@Pt NPs showed a good stability and could be reused after running 3 recycling, thus opening perspectives for the rational design of core-shell nanocatalysts with controlled shell morphologies.

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Chimie
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Dates et versions

hal-04868235 , version 1 (06-01-2025)

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Yinan Fan, Caroline Salzemann, Benoit Tremblay, Adrien Girard, Alexa Courty. Colloidal Ag@Pt Core–Shell Nanoparticles for the Catalytic Reduction of Nitrophenol. ACS Applied Nano Materials, 2024, 7 (6), pp.6130-6138. ⟨10.1021/acsanm.3c06033⟩. ⟨hal-04868235⟩
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