Synthesis of hollow PtAg alloy nanospheres with excellent electrocatalytic performances towards methanol and formic acid oxidations

Zheng, Fu-Lin; Luk, S.Y.; Kwong, Tsz‐Lung; Yung, Ka Fu

doi:10.1039/c6ra06398e

Cited by 44 publications

(19 citation statements)

References 47 publications

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“…As revealed by Figure B, the EASA of Pt 4 Co MDs (28.27 m 2 g −1 ) is obviously higher than those of Pt 3 Co NPs, Pt 5 Co NPs and Pt black with the values of 16.71, 16.33, and 20.35 m 2 g −1 , respectively. Furthermore, the value is also higher than PtCu nanoframes (12.4 m 2 g −1 ) and PtAg alloy nanospheres (18.7 m 2 g −1 ) . It reveals that Pt 4 Co MDs have the ability to enhance the diffusion of the electroactive species, suppress the Ostwald ripening, and facilitate the electron transport, ultimately improved the ORR catalytic activity …”

Section: Resultsmentioning

confidence: 89%

Facile Solvothermal Synthesis of Pt₄Co Multi‐dendrites: An Effective Electrocatalyst for Oxygen Reduction and Glycerol Oxidation

Jiang

Wang

et al. 2017

ChemElectroChem

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In this work, hierarchical Pt4Co multi‐dendrites (MDs) with abundant active sites were synthesized by using a one‐pot solvothermal co‐reduction approach, where cetyltrimethylammonium chloride (CTAC), citric acid, and oleylamine served as the structure director, eco‐friendly reducing agent, and co‐reductant, respectively. The architectures were mainly characterized by using a series of characterization techniques, demonstrating the enlarged electrochemically active surface area of 28.27 m2 g−1, much enhanced mass activity and specific activity for oxygen reduction reaction (279.14 mA mg−1Pt and 0.89 mA cm−2) and glycerol oxidation reaction (1422.56 mA mg−1Pt, 4.58 mA cm−2) comparable with commercial Pt black, along with the superior durability. These results demonstrate the potential applications of the synthesized Pt4Co MDs catalyst in energy storage and transformation.

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Section: Resultsmentioning

confidence: 89%

Facile Solvothermal Synthesis of Pt₄Co Multi‐dendrites: An Effective Electrocatalyst for Oxygen Reduction and Glycerol Oxidation

Jiang

Wang

et al. 2017

ChemElectroChem

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“…Herein, we report the preparation of graphene‐supported (PtAg/graphene) PtAg alloy nanocatalyst by a galvanic replacement reaction (GRR) . When being applied as catalyst towards MOR, it shows an enhanced electrocatalytic performance, including higher specific/mass activity and lower CO poisoning ability.…”

Section: Introductionmentioning

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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“…Furthermore, the superior stability of Ru@Pt0. nanocubes, [79] hollow porous PtPd alloy nanospheres, [80] mesoporous Pd@Pt microrods, [81] hollow PtAg alloy nanospheres, [82] uniform dendrite-like PtAu porous nanoclusters, [83] and Pt nanoparticles modified Au dendritic nanostructures [84] .…”

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confidence: 99%

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confidence: 99%

Metal‐Based Electrocatalysts for Methanol Electro‐Oxidation: Progress, Opportunities, and Challenges

Tong

Yan

Liang

et al. 2019

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Direct methanol fuel cells (DMFCs) are among the most promising portable power supplies because of their unique advantages, including high energy density/mobility of liquid fuels, This article is protected by copyright. All rights reserved. 2 low working temperature, and low emission of pollutants. Various metal-based anode catalysts have been extensively studied and utilized for the essential methanol oxidation reaction (MOR), due to their superior electrocatalytic performance. At present, especially with the rapid advance of nanotechnology, enormous efforts have been exerted to further enhancing the catalytic performance and minimizing the use of precious metals. Constructing multicomponent metal-based nanocatalysts with precisely designed structures can achieve this goal by providing highly tunable compositional and structural characteristics, which is promising for the modification and optimization of their related electrochemical properties. The recent advances of the metal-based electrocatalytic materials with rationally designed nanostructures and chemistries for MOR in DMFCs are highlighted and summarized herein. The effects of the well-defined nanoarchitectures on the improved electrochemical properties of the catalysts are illustrated. Finally, conclusive perspectives are provided on the opportunities and challenges for further refining the nanostructure of the metal-based catalysts and improving the electrocatalytic performance, as well as the commercial viability.

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Synthesis of hollow PtAg alloy nanospheres with excellent electrocatalytic performances towards methanol and formic acid oxidations

Abstract: Hollow PtAg alloy nanospheres were synthesized via galvanic replacement reaction between silver nanoparticles and K2PtCl4 at 60 °C.

Cited by 44 publications

References 47 publications

Facile Solvothermal Synthesis of Pt₄Co Multi‐dendrites: An Effective Electrocatalyst for Oxygen Reduction and Glycerol Oxidation

Facile Solvothermal Synthesis of Pt₄Co Multi‐dendrites: An Effective Electrocatalyst for Oxygen Reduction and Glycerol Oxidation

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

Metal‐Based Electrocatalysts for Methanol Electro‐Oxidation: Progress, Opportunities, and Challenges

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Synthesis of hollow PtAg alloy nanospheres with excellent electrocatalytic performances towards methanol and formic acid oxidations

Abstract: Hollow PtAg alloy nanospheres were synthesized via galvanic replacement reaction between silver nanoparticles and K2PtCl4 at 60 °C.

Cited by 44 publications

References 47 publications

Facile Solvothermal Synthesis of Pt4Co Multi‐dendrites: An Effective Electrocatalyst for Oxygen Reduction and Glycerol Oxidation

Facile Solvothermal Synthesis of Pt4Co Multi‐dendrites: An Effective Electrocatalyst for Oxygen Reduction and Glycerol Oxidation

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

Metal‐Based Electrocatalysts for Methanol Electro‐Oxidation: Progress, Opportunities, and Challenges

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Facile Solvothermal Synthesis of Pt₄Co Multi‐dendrites: An Effective Electrocatalyst for Oxygen Reduction and Glycerol Oxidation

Facile Solvothermal Synthesis of Pt₄Co Multi‐dendrites: An Effective Electrocatalyst for Oxygen Reduction and Glycerol Oxidation