Plasmonic-enhanced catalytic activity of methanol oxidation on Au–graphene–Cu nanosandwiches

Liu, Yaxing; Chen, Fuyi; Wang, Qiao; Wang, Junpeng; Wang, Jiali; Guo, Longfei; Gebremariam, Tesfaye Tadesse

doi:10.1039/c9nr00361d

Cited by 17 publications

(8 citation statements)

References 50 publications

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“…Therefore, the electron transfer at the MgO/graphene interface may occur from graphene to MgO. 38,39 As illustrated in Figure 4C MgO exhibit good contacts, consistent with the date shown in Figure 3F TEM images of the microstructure of the graphene/MgO composite bulk sample are shown in Figure 5A. The grain size of MgO is approximately 200 nm.…”

Section: Characterization Of Materialssupporting

confidence: 75%

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High electromagnetic interference shielding effectiveness in MgO composites reinforced by aligned graphene platelets

et al. 2021

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Graphene has been considered as an excellent filler to reinforce ceramics with enhanced properties. However, the uniform dispersion and controlled orientation of graphene sheets in a ceramic matrix have become major challenges toward higher performance. In this paper, we prepared MgO matrix composites with parallel graphene layers through the intercalation of the precursor into expandable graphite. We obtained a high electromagnetic interference (EMI) shielding effectiveness of ~30 dB, due to the multiple reflections and absorptance of electromagnetic waves between the parallel graphene layers. The hardness and strength of the MgO composite were also increased by introducing parallel graphene layers. All these properties suggest that the graphene/MgO composite represents a promising electromagnetic shielding material.

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Section: Characterization Of Materialssupporting

confidence: 75%

“…Based on this result, the monolayer graphene is in good contact with MgO. Therefore, the electron transfer at the MgO/graphene interface may occur from graphene to MgO 38,39 . As illustrated in Figure 4C, except for Mg‐O (531.2 eV), the C = O and C‐O vibrations in the O 1 s peaks are located at 529.8 and 532.2 eV, respectively.…”

Section: Resultsmentioning

confidence: 76%

High electromagnetic interference shielding effectiveness in MgO composites reinforced by aligned graphene platelets

et al. 2021

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“…The two-dimensional structure is also not easy to capture target molecules in microfluidics. Metal or dielectric DNFs structure [ 10 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ] has complex three-dimensional cross-linking networks to fix many target molecules. Chan et al presented that the Ag dendrites formed and protected by a 2 nm SiO 2 film on a Si surface [ 17 ] demonstrated a high sensitivity of 10 −8 M R6G Raman response.…”

Section: Introductionmentioning

confidence: 99%

Au@Ag Dendritic Nanoforests for Surface-Enhanced Raman Scattering Sensing

et al. 2021

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The effects of Au cores in Ag shells in enhancing surface-enhanced Raman scattering (SERS) were evaluated with samples of various Au/Ag ratios. High-density Ag shell/Au core dendritic nanoforests (Au@Ag-DNFs) on silicon (Au@Ag-DNFs/Si) were synthesized using the fluoride-assisted Galvanic replacement reaction method. The synthesized Au@Ag-DNFs/Si samples were characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, reflection spectroscopy, X-ray diffraction, and Raman spectroscopy. The ultraviolet-visible extinction spectrum exhibited increased extinction induced by the addition of Ag when creating the metal DNFs layer. The pure Ag DNFs exhibited high optical extinction of visible light, but low SERS response compared with Au@Ag DNFs. The Au core (with high refractive index real part) in Au@Ag DNFs maintained a long-leaf structure that focused the illumination light, resulting in the apparent SERS enhancement of the Ag coverage.

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“…Recently, various nanostructures of visible light excited plasmonic metals (Au, Ag) and their alloys have been synthesized and shown light‐induced enhancement of AOR. [ 61–76 ] The relevant system and activity enhancement have been summarized in Table 5 . Localized surface plasmon resonances (LSPRs) excitation enhances the activity of an electrocatalyst toward AOR via photothermal effect and/or photogenerated charges resulting from SPR excitation.…”

Section: Progress On Photoelectrocatalysts For Aormentioning

confidence: 99%

Recent Progress on Photo‐Promoted Alcohol Electrooxidation for Fuel Cells

et al. 2020

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Alcohol electrooxidation reaction (AOR) is of sluggish kinetics, which as the anodic reaction of direct alcohol fuel cells determines largely the discharging performance of the device. Solar energy as an endless energy source is introduced to promote the AOR kinetics. Herein, the recent progress on photopromoted AOR and the application in fuel cells is reviewed, including 1) design of the AOR photoelectrocatalysts, 2) photoelectrocatalysis mechanism, and 3) fabrication of photo-promoted direct alcohol fuel cells (PDAFCs). Finally, a perspective on the challenges of PDAFCs and new directions in this exciting and still emerging research area are given.

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Plasmonic-enhanced catalytic activity of methanol oxidation on Au–graphene–Cu nanosandwiches

Abstract: The positive hot holes from the SPR of Au NPs can be separated and delivered by the built-in electric field of Au-6T/SG/Cu, which are trapped on the surface of Au NPs to oxidise the adsorbed OH− anions into ˙OH radicals for the complete methanol oxidation.

Cited by 17 publications

References 50 publications

High electromagnetic interference shielding effectiveness in MgO composites reinforced by aligned graphene platelets

High electromagnetic interference shielding effectiveness in MgO composites reinforced by aligned graphene platelets

Au@Ag Dendritic Nanoforests for Surface-Enhanced Raman Scattering Sensing

Recent Progress on Photo‐Promoted Alcohol Electrooxidation for Fuel Cells

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