Controlled synthesis of dendritic Au@Pt core–shell nanomaterials for use as an effective fuel cell electrocatalyst

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

doi:10.1088/0957-4484/20/2/025605

Cited by 118 publications

(78 citation statements)

References 32 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: 76%

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: 76%

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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“…A practical approach, combining different metals with Pt have widely been adopted to reduce the amount of Pt and improve its activity and durability. Among those, Au is one of the interesting metals due to its superior oxygen-reduction-reaction activity and durability reported in Pt-Au nanostructures, where the Pt (shell)-Au (core) structures and the effect of Au decoration on the edges of Pt surfaces are used as a fuel cell catalyst [1][2][3][4][5]. Hence, it is essential to understand the local structures of both Pt and Au in an atomic scale to elucidate the mechanism of the catalytic reactions in Pt-Au nanostructures.…”

Section: Introductionmentioning

confidence: 99%

A Demonstration of Pt L3-Edge EXAFS Free from Au L3-Edge Using Log–Spiral Bent Crystal Laue Analyzers

et al. 2018

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Pt-Au nanostructures are important and well-studied fuel cell catalysts for their promising catalytic performance. However, a detailed quantitative local structure analysis, using extended X-ray absorption fine structure (EXAFS) spectroscopy, have been inhibited by interference between Pt and Au L 3 -edges. In this paper, Pt L 3 -edge XAFS analysis, free of Au L 3 edge, is demonstrated for a Pt-Au reference sample using a low-cost log-spiral bent crystal Laue analyzer (BCLA). This method facilitates the EXAFS structural analysis of Pt-Au catalysts, which are important to improve fuel cell catalysts.

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“…2 O 溶于水并定容成 100 mL 溶液, 取其中 1.88 mL 加 30 mL 水稀释. 在冰水浴和磁力搅拌(@750 r/min)条件下, 加入 10 mL 的 0.02 mol/L Na 3 Cit [41] , 然后在 15 min 内滴加 6.1 mL 新鲜配制的 0.01 mol/L NaBH 4 . 继续在室温下搅拌 (@1200 r/min) 12 h 以确保残余的 NaBH 4 分解.…”

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Controlled Synthesis of Gold-Platinum Catalysts for Ethanol Electro-oxidation Reaction

Kuangheng¹,

Zhou²,

Ma³

et al. 2018

Acta Chim. Sinica

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Controlled synthesis of dendritic Au@Pt core–shell nanomaterials for use as an effective fuel cell electrocatalyst

Cited by 118 publications

References 32 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

A Demonstration of Pt L3-Edge EXAFS Free from Au L3-Edge Using Log–Spiral Bent Crystal Laue Analyzers

Controlled Synthesis of Gold-Platinum Catalysts for Ethanol Electro-oxidation Reaction

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