Enhancing Photothermal Effect and Stability of Plasmonic Pd/Ag‐Nanosheet by Nanoassembly for Efficient Light‐Driven Catalytic Organic Hydrogenation. Issue 45 (2nd December 2019)

• Record Type: Journal Article
• Authors: Zhang, Jie; Li, Chuanping; Xu, Chen; Wang, Ping; Wang, Minmin; Jin, Yongdong
• Is Part Of: ChemistrySelect. Volume 4:Issue 45(2019)
• Page Start: 13173
• Page End: 13181
• Publication Date: 2019-12-02
• Subjects: Pd/Ag-nanosheet nanoassembly -- surface plasmon resonant coupling -- photothermal effect -- hot-electron -- photocatalytic hydrogenation; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201903915
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Due to the ability to harness surface plasmons to promote solar‐to‐chemical energy conversion, plasmonic nanoparticles with finely‐controlled structure and optical properties hold great promise for light‐activated catalysis. Herein, we prepared a strong plasmonic nanostructure, by assembling Pd/Ag nanosheets (NSs) with varied Pd/Ag ratio onto the surface of polystyrene (PS) microsphere to form a spherical nanoassembly (NAs). The as‐prepared Pd/Ag‐PS NAs showed better photothermal performance than the precursor Pd/Ag NSs of the same concentration. More importantly, the as‐prepared Pd/Ag‐PS NAs can be used to boost light‐driven organic hydrogenation reactions, in which Pd nanocomponent acts as hydrogenation reaction active sites and Pd/Ag‐NSs can convert light efficiently into heat. Under room temperature conditions, the light‐driven catalytic hydrogenation efficiency under 50 mW/cm 2 full‐spectrum irradiation proved to be comparable to that of thermally (70 °C) driven reactions. Moreover, the as‐prepared Pd/Ag‐PS NAs has better photostability than Pd/Ag NSs. The results proved that the photothermal effect rather than the transfer of hot electrons is responsible for enhanced photocatalytic hydrogenation performance. The strong plasmon coupling between closely‐packed Pd/Ag NSs enhances the electromagnetic field intensity and scattering intensity and increase Vis‐NIR light trapping and high density hot spots generation, which lead to an overall better photocatalytic efficiency. Abstract : A strong plasmonic nanostructure, by assembling Pd/Ag NSs with varied Pd/Ag ratio onto the surface of polystyrene microsphere to form a spherical nanoassembly. The as‐prepared Pd/Ag‐PS NAs showed better photothermal performance and stability than the precursor monomer Pd/Ag NSs of same concentration to boost light‐driven organic hydrogenation reactions, in which Pd nanocomponent acts as reaction active sites and the closely‐packed Pd/Ag NSs converts light more effectively into heat.