The relationship between the structure and ethanol oxidation activity of Pt-Cu/C alloy catalysts

Ghavidel, M R Zamanzad; Monteverde, Alessandro; Specchia, Vito; Easton, E. Bradley

doi:10.1016/j.electacta.2017.01.129

Cited by 34 publications

(12 citation statements)

References 70 publications

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“…The oxidation of chemisorbed CO on all platinum-copper catalysts begins at the potentials lower than those on Pt/C, and ends in a narrower range of potentials, approximately 0.63-0.88 V (Figure 3b,d). Bimodal maxima of CO oxidation (Figure 3b,d) can be related to heterogeneity of the composition and structure of bimetallic nanoparticles, as well as their size dispersion [30]. Electrocatalysts activity in the MOR was determined by the methods of cyclic voltammetry and chronopotentiometry.…”

Section: Methanol Electro-oxidation At the Alloyed And De-alloyed Plamentioning

confidence: 99%

“…It is important to make it sure that, firstly, the predominant dissolution of Cu atoms allows the formation of a secondary Pt shell that protects the internal copper atoms from dissolution [22,27,28]. Secondly, it is necessary to determine, whether such de-alloyed PtCu x−y /C catalysts retain high stability and activity in ORR and MOR, which are characteristic of the previously studied alloyed PtCu x /C catalysts [27][28][29][30][31]. Note that uneven distribution of the doping component atoms in the "body" of the initial PtM nanoparticles obtained during the synthesis, as well as the changes in conditions of their de-alloying can apparently affect both the composition and activity/stability of the de-alloyed catalysts [21,22,[32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

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Effective Platinum-Copper Catalysts for Methanol Oxidation and Oxygen Reduction in Proton-Exchange Membrane Fuel Cell

et al. 2020

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The behavior of supported alloyed and de-alloyed platinum-copper catalysts, which contained 14–27% wt. of Pt, was studied in the reactions of methanol electrooxidation (MOR) and oxygen electroreduction (ORR) in 0.1 M HClO4 solutions. Alloyed PtCux/C catalysts were prepared by a multistage sequential deposition of copper and platinum onto a Vulcan XC72 dispersed carbon support. De-alloyed PtCux−y/C catalysts were prepared by PtCux/C materials pretreatment in acid solutions. The effects of the catalysts initial composition and the acid treatment condition on their composition, structure, and catalytic activity in MOR and ORR were studied. Functional characteristics of platinum-copper catalysts were compared with those of commercial Pt/C catalysts when tested, both in an electrochemical cell and in H2/Air membrane-electrode assembly (MEA). It was shown that the acid pretreatment of platinum-copper catalysts practically does not have negative effect on their catalytic activity, but it reduces the amount of copper passing into the solution during the subsequent electrochemical study. The activity of platinum-copper catalysts in the MOR and the current-voltage characteristics of the H2/Air proton-exchange membrane fuel cell MEAs measured in the process of their life tests were much higher than those of the Pt/C catalysts.

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Section: Methanol Electro-oxidation At the Alloyed And De-alloyed Plamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effective Platinum-Copper Catalysts for Methanol Oxidation and Oxygen Reduction in Proton-Exchange Membrane Fuel Cell

et al. 2020

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“…Furthermore, numerous surface defects are observed from the atomic-resolution TEM image, which would provide abundant active sites accessible for small reactants (Figure S4). At the edge of the external layer, enriched stepped atoms show up on the border surfaces with various high index facets such as the {553}, {331}, and {221} planes, which would serve as highly active centers for catalytic reactions …”

Section: Resultsmentioning

confidence: 99%

One-Step Synthesis of PtCu Alloyed Nanocages with Highly Open Structures as Bifunctional Electrocatalysts for Oxygen Reduction and Polyhydric Alcohol Oxidation

Huang

Wang

Zhang

et al. 2018

ACS Appl. Energy Mater.

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Three-dimensional (3D) bimetallic PtCu alloyed nanocages (NCs) with highly open structures and large external-and internal-surfaces accessible for reactants were facilely synthesized by a one-pot solvothermal method. Arginine and cetyltrimethylammonium chloride (CTAC) acted as the costructure-directors and stabilizing agents. The resultant PtCu NCs showed significantly enhanced catalytic activity and improved stability when compared to commercial Pt/C (50 wt %) and Pt black catalysts toward oxygen reduction reaction (ORR), ethylene glycol oxidation reaction (EGOR), and glycerol oxidation reaction (GOR) in alkaline electrolyte. This work provides guidelines for rational synthesis of highly open cagelike architectures.

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“…Direct ethanol fuel cells (DEFCs) have many advantages such as high power density, environmental friendliness, rapid start-up and mobility, so they are believed as the most promising high energy conversion system for practical applications in mobile devices such as automotive and portable power ( Singla et al, 2017 ; Jiang et al, 2018 ; Oh et al, 2019 ; Wang et al, 2022 ). However, there are still many challenges in the energy conversion processes of DEFCs, such as the difficulty in splitting the C-C bond of ethanol and the sluggish kinetics of electrocatalytic oxidation ( Du et al, 2017 ; Zamanzad Ghavidel et al, 2017 ; Zhang et al, 2018 ). Reasonable use of catalysts can improve the energy output efficiency and overall performance of fuel cells, the problem of incomplete oxidation of ethanol can be effectively solved in DEFCs ( Corradini et al, 2015 ; Huang et al, 2015 ; Bach Delpeuch et al, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

Self-Assembled Pt/MoCx/MWCNTs Nano Catalyst for Ethanol Electrooxidation of Fuel Cells

et al. 2022

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Direct ethanol fuel cells (DEFCs) have attracted more and more attention because of their unique advantages such as low cost and low toxicity. However, sluggish C-C bond cleavage during the ethanol electrooxidation reaction (EOR) in acidic media results in a lower energy yield and gravely hinders the commercialization of DEFCs. Therefore, it is very necessary to develop an anode catalyst with high performance, high stability and low cost to solve this problem. In this paper, Pt/MoCx/MWCNTs nanocomposites with different mass ratios of PtMo were obtained through a molecular self-assembly technology. The structure and morphology of Pt/MoCx/MWCNTs nanocomposites were characterized by several techniques such as XRD, FESEM, XPS, etc. The electrochemical performance and stability of Pt/WCx/MWCNTs electrocatalysts toward EOR were investigated in acid electrolytes. The results show that PtMo exists in the form of alloy. The size of Pt/MoCx nanoparticles is very uniform with an average size of ∼24 nm. The Pt/MoC0.25/MWCNTs exhibits excellent electrocatalytic activities with an electrochemically active surface area of 37.1 m2 g−1, a peak current density of 610.4 mA mgPt−1 and a steady-state current density of 39.8 mA mgPt−1 after 7,200 s, suggesting that the Pt/MoC0.25/MWCNTs is a very promising candidate for application in EOR of DEFCs.

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The relationship between the structure and ethanol oxidation activity of Pt-Cu/C alloy catalysts

Cited by 34 publications

References 70 publications

Effective Platinum-Copper Catalysts for Methanol Oxidation and Oxygen Reduction in Proton-Exchange Membrane Fuel Cell

Effective Platinum-Copper Catalysts for Methanol Oxidation and Oxygen Reduction in Proton-Exchange Membrane Fuel Cell

One-Step Synthesis of PtCu Alloyed Nanocages with Highly Open Structures as Bifunctional Electrocatalysts for Oxygen Reduction and Polyhydric Alcohol Oxidation

Self-Assembled Pt/MoCx/MWCNTs Nano Catalyst for Ethanol Electrooxidation of Fuel Cells

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