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Research Article

Screwdriver-like Pd-Ag heterostructures formed via selective deposition of Ag on Pd nanowires as efficient photocatalysts for solvent-free aerobic oxidation of toluene

Caihong He1, Lingli Yu1, Na Lu1, Wenjing Wang1, Wei Chen1( ), Shaojie Lu1, Yun Yang1, Dekun Ma1, Shaoming Huang1,2( )
Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, China
School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
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Abstract

Heterostructured bimetal nanocrystals with a component having localized surface plasmon resonance (LSPR) property are promising photocatalysts for a series of reactions. In this work, kinetic products of Pd-Ag with a screwdriver-like heterostructure have been successfully fabricated via the selective epitaxial growth of Ag on Pd nanowires (NWs). It was confirmed that the deposition rate (Vdeposition) of Ag is much more sensitive to the temperature, compared to the surface diffusion rate (Vdiffusion) which can be effectively reduced by the binding of poly(vinylpyrrolidone) (PVP) molecules. Then the magnitude of Vdeposition/Vdiffusion has been well tailored for the formation of a kinetic growth environment. The interactions between the components of the as-prepared Pd-Ag heterostructures resulted in intensified LSPR effects. As a result, they gained better photocatalytic performance toward solvent free aerobic oxidation of toluene than Pd NWs, Ag NWs and the mixture of them. Additionally, the Pd-Ag heterostructured nanocrystals exhibited excellent catalytic stability for recycling. This work not only presents an idea for realizing kinetic growth but also supports that LSPR effect is a good tool for improving the photocatalytic activity.

Keywords

heterostructureselective growthkineticsaerobic oxidation reaction

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Nano Research
Volume 13 Issue 3,
March 2020
Pages 646-652
DOI: 10.1007/s12274-020-2667-2
Cite this article:
He C, Yu L, Lu N, et al. Screwdriver-like Pd-Ag heterostructures formed via selective deposition of Ag on Pd nanowires as efficient photocatalysts for solvent-free aerobic oxidation of toluene. Nano Research, 2020, 13(3): 646-652. https://doi.org/10.1007/s12274-020-2667-2
Topics:
Binary alloysEnzyme kineticsGrowth kineticsHeterojunctionsKinetics NanocrystalsNanowiresOrganic solventsOxidationPalladiumPhotocatalytic activity SilverSurface plasmon resonance

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Received: 28 December 2019
Revised: 11 January 2020
Accepted: 18 January 2020
Published: 20 February 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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