Influence of the support on PtSn electrocatalysts behavior: Ethanol electro-oxidation performance and in-situ ATR-FTIRS studies

Silva, Elen Leal da; Cuña, Andrés; Ortega-Vega, Maria Rita; Radtke, C.; Machado, Giovanna; Tancredi, Néstor; Malfatti, Célia de Fraga

doi:10.1016/j.apcatb.2016.04.021

Cited by 27 publications

(6 citation statements)

References 45 publications

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“…Therefore, both the ternary synergism and the suitable Pt exposure are crucial for improving the mass activity. It is worth mentioning that the mass activity of Pt-0.5SnO x /NCNC (1187 mA mg Pt –1 ) is almost 4.0-fold higher than that of the 20 wt % commercial Pt/C (297 mg Pt –1 ) and also obviously larger than the data for most reported catalysts to date (Table S2 in the Supporting Information), − suggesting a great potential for application. The stability of the series of catalysts shows a tendency of first an increase (from n = 0 to 0.5) and then a decrease (from n = 0.5 to 1.7) after a 5000 s test, similar to the changing trend of the EOR activity with the Sn/Pt ratio.…”

Section: Resultsmentioning

confidence: 86%

Efficient Ternary Synergism of Platinum/Tin Oxide/Nitrogen-Doped Carbon Leading to High-Performance Ethanol Oxidation

Zhang

Mao

et al. 2018

ACS Catal.

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Direct ethanol fuel cells are attractive alternative power sources due to the use of liquid fuels featuring high energy density, low toxicity, easy storage, and biomass-derived production. To date, most Pt-based electrocatalysts are still limited by low mass activity and high susceptibility to poisoning for the ethanol oxidation reaction (EOR) in acidic medium. Herein, we have constructed a ternary platinum/tin oxide/nitrogen-doped carbon electrocatalyst for the EOR by highly dispersing the hybridized platinum/tin oxide on nitrogen-doped carbon nanocages. CO electrooxidation from the stripping experiments is used as a sensitive indicator to evaluate the antipoisoning capability of the catalysts. By a comparison study on a series of designed catalysts, the correlation of the CO resistibility with the geometrical configuration has been well established for the catalysts. We demonstrate that the efficient ternary synergism of Pt/SnO x /N-doped sp2-C via the heterointerfaces is the key to high CO resistibility, which could facilitate the oxidative removal of CO species at Pt sites by the adsorbed OH species generated at neighboring SnO x sites and thereby the facile regeneration of Pt active sites. Accordingly, a synergistic catalyst has been optimized which shows high EOR performance in acidic medium with a mass activity of 1187 mA mgPt –1 and high durability, in comparison with most reported catalysts to date. This study provides an approach of exploring advanced EOR electrocatalysts for potential applications.

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Section: Resultsmentioning

confidence: 86%

Efficient Ternary Synergism of Platinum/Tin Oxide/Nitrogen-Doped Carbon Leading to High-Performance Ethanol Oxidation

Zhang

Mao

et al. 2018

ACS Catal.

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“…The electrochemical measurements of the Pt/V and Pd/V samples were carried out in a 1.0 mol L -1 ethanol + 0.5 mol L -1 H 2 SO 4 solution and in a 1.0 mol L -1 ethanol + 1.0 mol L -1 NaOH solution respectively. Measurements were carried out at room temperature in a standard threeelectrode cell with a Pt wire as counter electrode, and using a potentiostat/galvanostat AUTOLAB PGSTAT 302N as was described in our previous work [9]. Saturated Calomel Electrode (SCE) reference electrode was used for the experiments in acidic electrolyte and Hg/HgO reference electrode in alkaline medium.…”

Section: A Electrocatalysts Preparation and Characterizationmentioning

confidence: 99%

Electrocatalytic performance comparison of Pt/V and Pd/V electrocatalysts for ethanol oxidation reaction

Silva¹,

Cuña²,

Khan³

et al. 2024

RE&PQJ

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Direct ethanol fuel cells (DEFCs) operate at low temperature, which makes the oxidation and reduction reactions slower, requiring electrocatalysts able to accelerate these reactions. In the present work, commercial Vulcan carbon (V) supported Pt and Pd catalysts were compared as electrocatalysts for ethanol oxidation reaction (EOR) in acidic and alkaline medium, respectively. Cyclic voltammetries obtained in presence of ethanol showing a better catalytic performance for the Pd/V electroctalyst compared to the Pt/V electrocatalyst. The maximum current density related with the EOR in a 1.0 mol L -1 ethanol + 1.0 mol L -1 NaOH solution was 236.9 A g Pd -1for Pd/V. The better performance of the Pd/V electrocatalyst can be associated with a lower Pd nanoparticles sizes and higher particles dispersion onto the Vulcan carbon surface in the Pd/V electrocatalyst. The onset potential for the EOR was 0.2 V vs. SCE for the Pt/V sample and -0.6 V vs. Hg/HgO for the Pd/V sample.

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“…Owing to the high energy density (8.01 kW h kg –1 ), environmental friendliness, adequate security, and non-toxicity of ethanol fuel, direct ethanol fuel cells (DEFCs) have drawn wide attention and have been considered to be promising portable power devices for vehicles and electronics. − However, the sluggish reaction kinetics for oxidation of ethanol molecules at the anode of DEFCs seriously impedes the cell performance and slows down their commercialization. ,,− Ethanol could be electrocatalytically oxidized by anodic electrocatalysts via two pathways, i.e., the complete oxidation to CO 2 by delivering 12 electrons (C1 pathway) and the usually dominant incomplete oxidation to mainly generate acetic acid involving 4 electrons (C2 pathway). ,, Therefore, massive efforts have been continuously devoted to promote the catalytic performance of the anodic electrocatalysts for ethanol oxidation reaction (EOR) and selectivity toward the C1 pathway. ,− Palladium (Pd)-based nanomaterials have been demonstrated to possess considerable electrocatalytic performance for EOR in an alkaline medium, even higher than that of platinum (Pt)-based nanomaterials. ,,,,− Therefore, the design and synthesis of efficient Pd-based EOR electrocatalysts have become a focus in the research field of electrocatalysis.…”

Section: Introductionmentioning

confidence: 99%

Ternary CuZnPd Nanoalloys Achieving the Synergy of an Electronic Interaction and Bifunctional Catalysis for Efficient Ethanol Electrooxidation

Qin

Fan

Zeng

et al. 2023

ACS Appl. Energy Mater.

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Rationally constructing nanoalloys achieving the synergy of multiple interactions among different constituents could substantially enhance the electrocatalytic performance of an active metal for a given chemical reaction. In this context, we design and synthesize well-controlled ternary CuZnPd alloy nanoparticles, in which the Cu atoms modify the electronic configuration of Pd atoms through the ligand effect or the lattice strain effect, while the Zn atoms clean their neighboring Pd sites through a bifunctional mechanism, and the synergy of these two benefits endows the ternary CuZnPd alloy nanoparticles with exceptional electrocatalysis for a room-temperature ethanol oxidation reaction (EOR). In specific, at an appropriate 1/1/1 molar ratio for Cu/Zn/Pd, the as-prepared ternary CuZnPd alloy nanoparticles exhibit both the highest specific activity and mass activity of 17.3 mA cm–2 and 11.8 A mg–1, respectively, which outperform those of their CuPd, ZnPd alloy counterparts and the commercial Pd/C catalyst, as well as the majority of recently reported Pd-based catalysts. Density functional theory calculations verify that the key CO* and CH3CHO* intermediates generated during the EOR have the lowest adsorption energy on the ternary CuZnPd alloy nanoparticles, which is responsible for their boosted EOR electrocatalysis.

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Influence of the support on PtSn electrocatalysts behavior: Ethanol electro-oxidation performance and in-situ ATR-FTIRS studies

Cited by 27 publications

References 45 publications

Efficient Ternary Synergism of Platinum/Tin Oxide/Nitrogen-Doped Carbon Leading to High-Performance Ethanol Oxidation

Efficient Ternary Synergism of Platinum/Tin Oxide/Nitrogen-Doped Carbon Leading to High-Performance Ethanol Oxidation

Electrocatalytic performance comparison of Pt/V and Pd/V electrocatalysts for ethanol oxidation reaction

Ternary CuZnPd Nanoalloys Achieving the Synergy of an Electronic Interaction and Bifunctional Catalysis for Efficient Ethanol Electrooxidation

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