The composition-controlled synthesis of Pt-Ag bimetallic nanochains for catalytic methanol oxidation

Kim, Sung-Min; Jo, Yugeun; Lee, Sang-Yul

doi:10.1016/j.electacta.2015.06.114

Cited by 30 publications

(12 citation statements)

References 49 publications

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“…They can be indexed to (111), (200), (220) and (311) planes of Ag (JCPDS Card No. 87–0718) [23]. These results indicate that Ag NPs have been successfully deposited on the surface of the Nf samples.…”

Section: Resultsmentioning

confidence: 82%

Synthesis of Ag‐loaded tungsten oxide microspheres and their improved photocatalytic activity

She

Zhu

Zhou

et al. 2020

Micro & Nano Letters

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In this study, tungsten oxide microstructures/nanostructures with different morphologies were prepared by the hydrothermal synthesis methods. The morphologies and structures of the obtained products were characterised by field-emission scanning electron microscopy and X-ray diffraction. The photocatalytic properties of tungsten oxide microstructures/nanostructures were characterised by the degradation of rhodamine B solution. The results indicate that tungsten oxide microspheres prepared by using tungstic acid and hydrogen peroxide solution as raw materials show the highest photocatalytic activity. By changing the concentration of tungstic acid used in the synthesis process, the morphologies of tungsten oxide microspheres can be controlled. The influences of the amount of chemical reagent addition on its morphology and catalytic properties were discussed. In order to further improve the photocatalytic activity of the samples, Ag nanoparticles were loaded on the obtained tungsten oxide microspheres. The photocatalytic experiment results indicate that the photocatalytic performance of tungsten oxide was improved by Ag loading. The results indicate that Ag-loaded tungsten oxide microspheres are favourable for their photocatalytic applications.

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Section: Resultsmentioning

confidence: 82%

Synthesis of Ag‐loaded tungsten oxide microspheres and their improved photocatalytic activity

She

Zhu

Zhou

et al. 2020

Micro & Nano Letters

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“…04−0802). Compared with pure Pt, the formation of PtAg alloy induces a shift of diffraction peaks to low 2θ values, implying a lattice expansion upon the substitution of smaller Pt atom by Ag with a larger size ,,…”

Section: Resultsmentioning

confidence: 99%

Methanol Oxidation Reaction Performance on Graphene‐Supported PtAg Alloy Nanocatalyst: Contrastive Study of Electronic and Geometric Effects Induced from Ag Doping

et al. 2018

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In Pt‐based alloy catalyst, the electrocatalytic performance is highly related to the Pt d‐band center, whose position can be modulated by the synergetic interaction of electronic and geometric effects. In this study, graphene‐supported PtAg (PtAg/graphene) alloy nanocatalyst was prepared by a facile galvanic replacement reaction. Due to the introduction of Ag component, the PtAg/graphene exhibits a higher specific/mass activity (1.48 mA cm–2, 580 mA mgPt–1) and better CO tolerance (CO stripping potential: 0.45 V vs. Ag/AgCl) than those of commercial Pt/C catalyst (0.86 mA cm–2, 270 mA mgPt–1, 0.50 V vs. Ag/AgCl) when being applied for catalyzing methanol oxidation reaction (MOR). On the basis of component and structure characterization, the PtAg alloy catalyst model was constructed, and first‐principles density function theory calculation was applied to study the relative influence of electronic and geometric effects on the Pt d‐band center and CO binding energy, respectively. It is found that the electronic effect, i. e. the charge transfer from Ag to Pt, is the decisive factor to enhance the electrocatalytic performance of PtAg alloy towards MOR.

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“…The Pt 4f XPS spectrum (Figure 2d) exhibited peaks corresponding to the Pt 4f 7/2 peak at 71.3 eV and the Pt 4f 5/2 peak at 74.8 eV that were close to the Pt foil reference (black line in Figure 2d); these peaks were suggested to be due to spin–orbit splitting arising from Pt having an oxidation state of zero. [ 28 ] However, the slight peak shifts in the Pt 4f spectrum of Pt 1 Ag 24 /g‐C 3 N 4 to lower binding energies than the reference could indicate the possibility of charge transfer within the catalyst [ 24 ] that was not observed in the Ag 3d spectrum. In addition to XPS, XAS was used to confirm the electronic properties of Pt 1 Ag 24 /g‐C 3 N 4 .…”

Section: Ag‐thiolate Single‐atom Alloy Nanoclustersmentioning

confidence: 99%

Thiolate‐Protected Single‐Atom Alloy Nanoclusters: Correlation between Electronic Properties and Catalytic Activities

Walsh

Zhang

2020

Adv Materials Inter

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Due to their interesting chemical and optical properties, metal nanoclusters are used in various catalytic reactions and in energy conversion. By incorporating thiolate‐protecting ligands, their size and composition can be tuned. Doping these nanoclusters to form single‐atom alloy (SAA) nanoclusters is shown to further enhance these properties as a result from the synergy between the dopant and host atoms. In addition to their optical and chemical properties, SAA nanoclusters also have interesting electronic properties. However, these properties are often underdiscussed when studying SAA nanoclusters. This review provides an overview of representative studies done on the in‐depth understanding of the electronic properties and catalytic activities of Ag‐based and Au‐based thiolate‐protected SAA nanoclusters. The use of density functional theory (DFT), X‐ray absorption spectroscopy, and X‐ray photoelectron spectroscopy are employed to correlate the changes in charge states of thiolate‐protected SAA nanoclusters with their superior catalytic activity versus monometallic nanoclusters. DFT, UV–vis spectroscopy, and voltammetric methods link the changes in molecular energy levels of thiolate‐protected SAA nanoclusters to their enhanced catalytic performance over monometallic nanoclusters.

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The composition-controlled synthesis of Pt-Ag bimetallic nanochains for catalytic methanol oxidation

Cited by 30 publications

References 49 publications

Synthesis of Ag‐loaded tungsten oxide microspheres and their improved photocatalytic activity

Synthesis of Ag‐loaded tungsten oxide microspheres and their improved photocatalytic activity

Methanol Oxidation Reaction Performance on Graphene‐Supported PtAg Alloy Nanocatalyst: Contrastive Study of Electronic and Geometric Effects Induced from Ag Doping

Thiolate‐Protected Single‐Atom Alloy Nanoclusters: Correlation between Electronic Properties and Catalytic Activities

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