Controlled deposition of Pt on Au nanorods and their catalytic activity towards formic acid oxidation

Wang, Shuangyin; Kristian, Noel; Jiang, San Ping; Wang, Xin

doi:10.1016/j.elecom.2008.04.018

Cited by 105 publications

(57 citation statements)

References 18 publications

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“…This finding is in excellent agreement with several earlier reports that have clearly indicated that bimetallic nanoparticles exhibit an enhanced electro-catalytic activity compared with pure metal nanoparticles. [17][18][19] A similar behavior was also reported for multicomponent systems formed of graphene sheets decorated with bimetallic nanoparticles. 20 In their recent work, Hu et al 21 demonstrated that graphenebimetallic Pt-Au nanoparticles exhibited an enhanced electro-catalytic activity, compared with Au-graphene or Pt-graphene.…”

Section: S-captopril 1-(3-mercapto-2-(s)-methyl-1-oxopropyl)-s(l)supporting

confidence: 77%

Direct electrochemical oxidation of S-captopril using gold electrodes modified with graphene-AuAg nanocomposites

Pogăcean

Biriş

Coroș

et al. 2014

IJN

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In this paper, we present a novel approach for the electrochemical detection of S -captopril based on graphene AuAg nanostructures used to modify an Au electrode. Multi-layer graphene (Gr) sheets decorated with embedded bimetallic AuAg nanoparticles were successfully synthesized catalytically with methane as the carbon source. The two catalytic systems contained 1.0 wt% Ag and 1.0 wt% Au, while the second had a larger concentration of metals (1.5 wt% Ag and 1.5 wt% Au) and was used for the synthesis of the Gr-AuAg-1 and Gr-AuAg-1.5 multicomponent samples. High-resolution transmission electron microscopy analysis indicated the presence of graphene flakes that had regular shapes (square or rectangular) and dimensions in the tens to hundreds of nanometers. We found that the size of the embedded AuAg nanoparticles varied between 5 and 100 nm, with the majority being smaller than 20 nm. Advanced scanning transmission electron microscopy studies indicated a bimetallic characteristic of the metallic clusters. The resulting Gr-AuAg-1 and Gr-AuAg-1.5 samples were used to modify the surface of commonly used Au substrates and subsequently employed for the direct electrochemical oxidation of S -captopril. By comparing the differential pulse voltammograms recorded with the two modified electrodes at various concentrations of captopril, the peak current was determined to be well-defined, even at relatively low concentration (10 −5 M), for the Au/Gr-AuAg-1.5 electrode. In contrast, the signals recorded with the Au/Gr-AuAg-1 electrode were poorly defined within a 5×10 −6 to 5×10 −3 M concentration range, and many of them overlapped with the background. Such composite materials could find significant applications in nanotechnology, sensing, or nanomedicine.

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Section: S-captopril 1-(3-mercapto-2-(s)-methyl-1-oxopropyl)-s(l)supporting

confidence: 77%

Direct electrochemical oxidation of S-captopril using gold electrodes modified with graphene-AuAg nanocomposites

Pogăcean

Biriş

Coroș

et al. 2014

IJN

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“…Pt and Pd metals have shown to be the most frequently used catalyst materials for formic acid electrooxidation [15][16][17][18]. But the previous studies have shown that the electrooxidation rate of formic acid at the Pt catalyst is insufficient for the practical application, because the mechanism for formic acid oxidation at a Pt electrode has been widely accepted as taking place via a dual path, which involves a reactive intermediate path and adsorbed CO as a poisoning species [19][20][21].…”

Section: Introductionmentioning

confidence: 98%

Kinetic Study of Formic Acid Oxidation on Highly Dispersed Carbon Supported Pd–TiO2 Electrocatalyst

Gao

et al. 2009

Catal Lett

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The highly dispersed carbon supported Pd-TiO 2 catalyst was prepared by a liquid phase reduction method with intermittent microwave irradiation. The kinetic parameters, such as the charge transfer parameter (a) and the apparent diffusion coefficient (D) of formic acid electrooxidation on a carbon supported Palladium Titanium dioxide (Pd-TiO 2 /C) electrode were obtained under the quasi steady-state conditions. The dependence on temperature of the formic oxidation at a Pd-TiO 2 /C electrode was also investigated and the activation energy (E a ) at different potentials was obtained.

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“…Among noble metals, Pt is attractive because of its superior electrocatalytic and catalytic activities [15,16], but Pt-based applications have been limited by the inherent high consumption of expensive Pt. As an attempt to reduce Pt demands, the formation of a Pt layer on another relatively cheap metal has been widely employed and such Pt layers exhibit better electrocatalytic activity than the bulk metal [4,[17][18][19][20], and in the case of a Pt (sub)monolayer, every Pt atom can contribute to the electrocatalytic reaction [19].…”

Section: Introductionmentioning

confidence: 99%

Selective deposition of Pt on Au nanoparticles using hydrogen presorbed into Au nanoparticles during NaBH4 treatment

Patra

Das

Yang

2009

Electrochimica Acta

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Controlled deposition of Pt on Au nanorods and their catalytic activity towards formic acid oxidation

Cited by 105 publications

References 18 publications

Direct electrochemical oxidation of S-captopril using gold electrodes modified with graphene-AuAg nanocomposites

Direct electrochemical oxidation of S-captopril using gold electrodes modified with graphene-AuAg nanocomposites

Kinetic Study of Formic Acid Oxidation on Highly Dispersed Carbon Supported Pd–TiO2 Electrocatalyst

Selective deposition of Pt on Au nanoparticles using hydrogen presorbed into Au nanoparticles during NaBH4 treatment

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