Ptshell–Aucore/C electrocatalyst with a controlled shell thickness and improved Pt utilization for fuel cell reactions

Kristian, Noel; Wang, Xin

doi:10.1016/j.elecom.2007.10.011

Cited by 151 publications

(45 citation statements)

References 15 publications

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“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 bimetallic with Au/Pt molar ratio of 1:1 also exhibited the prominent electrocatalytic activity. 55 …”

Section: Electrocatalytic Properties For Hydrogen Generationmentioning

confidence: 97%

Composition-Dependent Catalytic Activities of Noble-Metal-Free NiS/Ni₃S₄ for Hydrogen Evolution Reaction

et al. 2016

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The development of efficient noble-metal-free hydrogen evolution catalysts is quite appealing with the aim of providing cost-competitive hydrogen.Herein, nickel sulfides (NiS x ) with tunable NiS/Ni 3 S 4 molar ratios were synthesized via a simple hydrothermal method. Detailed electrochemical studies under neutral conditions indicated that the electrocatalytic property of NiS x catalysts was determined by the composition. Notably, the NiS x sample with the NiS/Ni 3 S 4 molar ratio of 1.0 exhibited the lowest overpotential and charge-transfer resistance. As analyzed from the Tafel plots, the rate determining step of NiS x catalysts for hydrogen generation was the Volmer step, in which the proton adsorption played a key role.Theoretical calculation revealed that NiS and Ni 3 S 4 exhibited the metallic behaviors with different work functions. Consequently, the NiS x sample with the NiS/Ni 3 S 4 molar ratio of 1.0 owned the most adsorbed protons, which led to the highest electrocatalytic property. Meanwhile, NiS x was demonstrated to be efficient cocatalysts to promote photocatalytic hydrogen generation. NiS x /CdS with the S 4 molar ratio of 1.0 showed the best photocatalytic activity with the apparent quantum efficiency of 56.5% at 420 nm. This result was in good agreement with the electrocatalytic activities of NiS x samples, indicating the intrinsic property for efficient hydrogen generation.

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Section: Electrocatalytic Properties For Hydrogen Generationmentioning

confidence: 97%

Composition-Dependent Catalytic Activities of Noble-Metal-Free NiS/Ni₃S₄ for Hydrogen Evolution Reaction

et al. 2016

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“…[1] Besides the use of carbon-supported Pt alloys, several recent reports suggest core-shell nanoparticles as catalyst materials for PEM fuel cells. The various methods suggested to prepare such catalysts include chemical synthesis using reducing agents for the preparation of, for example, Pt@Fe, [7] Au@Pt/C, [8] and Ni@Pt [9] core@shell catalysts, redox displacement of the core by a more noble metal forming the shell to yield, for example, Co@Au [10] and Fe@Pt [11] catalysts, and redox displacement of a layer of Cu formed by underpotential deposition (UPD) on a core to yield a monolayer of Pt in, for example, Au@Pt [12] and Pd@Pt. [13] Redox displacement of Cu has also been used with single crystals to form a monolayer of Pt [13] and on thermally segregated alloy cores to yield, for example, NiAu@Pt.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Synthesis of Core–Shell Catalysts for Electrocatalytic Applications

et al. 2010

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A novel electrochemical method to prepare platinum shells around carbon-supported metal nanoparticles (Ru and Au) by pulsed electrodeposition from solutions containing Pt ions is presented. Shell formation is confirmed by characteristic changes in the cyclic voltammograms, and is further evidenced by monitoring particle growth by transmission electron microscopy as well as by energy-dispersive analysis of X rays (EDX). Scanning electrochemical microscopy and EDX measurements indicate a selective Pt deposition on the metal/carbon catalyst, but not on the glassy carbon substrate. The thus prepared carbon-supported core-shell nanoparticles are investigated with regard to their activity in electrocatalytic oxygen reduction, which demonstrates the applicability of these materials in electrocatalysis or sensors.

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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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Ptshell–Aucore/C electrocatalyst with a controlled shell thickness and improved Pt utilization for fuel cell reactions

Cited by 151 publications

References 15 publications

Composition-Dependent Catalytic Activities of Noble-Metal-Free NiS/Ni₃S₄ for Hydrogen Evolution Reaction

Composition-Dependent Catalytic Activities of Noble-Metal-Free NiS/Ni₃S₄ for Hydrogen Evolution Reaction

Electrochemical Synthesis of Core–Shell Catalysts for Electrocatalytic Applications

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

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Ptshell–Aucore/C electrocatalyst with a controlled shell thickness and improved Pt utilization for fuel cell reactions

Cited by 151 publications

References 15 publications

Composition-Dependent Catalytic Activities of Noble-Metal-Free NiS/Ni3S4 for Hydrogen Evolution Reaction

Composition-Dependent Catalytic Activities of Noble-Metal-Free NiS/Ni3S4 for Hydrogen Evolution Reaction

Electrochemical Synthesis of Core–Shell Catalysts for Electrocatalytic Applications

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

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Composition-Dependent Catalytic Activities of Noble-Metal-Free NiS/Ni₃S₄ for Hydrogen Evolution Reaction

Composition-Dependent Catalytic Activities of Noble-Metal-Free NiS/Ni₃S₄ for Hydrogen Evolution Reaction