Sol–gel derived WOx and WOx/Pt films for direct methanol fuel cell catalyst applications

McLeod, Eric; Birss, Viola I.

doi:10.1016/j.electacta.2005.05.026

Cited by 50 publications

(19 citation statements)

References 24 publications

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“…Tungsten was used to promote Pt in different oxidation processes in which its oxides interacted with CO adsorbed on the Pt surface [36]. In the case of the methanol oxidation reaction (MOR), it has been assumed that WO x operates via a bifunctional mechanism [36] or via a hydrogen spillover effect [37][38][39] according to the following reactions:…”

Section: Introductionmentioning

confidence: 99%

Effect of W on PtSn/C catalysts for ethanol electrooxidation

et al. 2008

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Binary and ternary Pt-based catalysts were prepared by the Pechini-Adams modified method on carbon Vulcan XC-72, and different nominal compositions were characterized by TEM and XRD. XRD showed that the electrocatalysts consisted of the Pt displaced phase, suggesting the formation of a solid solution between the metals Pt/W and Pt/Sn. Electrochemical investigations on these different electrode materials were carried out as a function of the electrocatalyst composition, in acid medium (0.5 mol dm -3 H 2 SO 4 ) and in the presence of ethanol. The results obtained at room temperature showed that the PtSnW/C catalyst display better catalytic activity for ethanol oxidation compared to PtW/C catalyst. The reaction products (acetaldehyde, acetic acid and carbon dioxide) were analyzed by HPLC and identified by in situ infrared reflectance spectroscopy. The latter technique also allowed identification of the intermediate and adsorbed species. The presence of linearly adsorbed CO and CO 2 indicated that the cleavage of the C-C bond in the ethanol substrate occurred during the oxidation process. At 90°C, the Pt 85 Sn 8 W 7 /C catalyst gave higher current and power performances as anode material in a direct ethanol fuel cell (DEFC).

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Section: Introductionmentioning

confidence: 99%

Effect of W on PtSn/C catalysts for ethanol electrooxidation

et al. 2008

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“…6.4.1.1 Pt-W Improved methanol oxidation activity of WO x -containing Pt-based catalysts have been reported [64,125,126]. McLeod and Birss [128] used WO x as support for Pt catalysts. They obtained high methanol oxidation currents per geometrical anode area, but the actual turnover number for the MOR per Pt site turned out to be small.…”

Section: Pt-based Binary Catalystsmentioning

confidence: 90%

Platinum Alloys as Anode Catalysts for Direct Methanol Fuel Cells

Antolini

2009

Electrocatalysis of Direct Methanol Fuel Cells

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“…As a typical example, Fu et al reported the use of the synergistic effect between tungsten carbide( WC) and Pd to enhancet he catalytic activity of Pd fort he electro-oxidation of ethanoli n an alkaline solution. [215,216] Noble metals, such as Pt and Pd, werec onventionally integratedw ith transition-metal oxidest of orm nanocomposites to enhancet heir electrocatalytic performance in the EOR. Electrochemical testsi ndicatet hat this electron transfer is responsible for the enhanced catalytic performance of WCÀPd nanocomposites for the electro-oxidation of ethanol.…”

Section: Noble-metal-based Composite Nanocatalysts For the Eormentioning

confidence: 99%

“…Therefore, intermediate CO specieso nP ds ites formed duringt he EOR can be removed in at imely manner by adjacent ÀOH active species on the WC domains through ab ifunctional mechanism [200,214] or the hydrogen spillover effect. [215,216] Noble metals, such as Pt and Pd, werec onventionally integratedw ith transition-metal oxidest of orm nanocomposites to enhancet heir electrocatalytic performance in the EOR. [217][218][219][220][221][222][223][224][225][226][227][228][229][230][231][232] The enhanced EOR is derived first from surfaces rich in oxygen-containing species providedb yt he metal oxides, which are capable of removing adsorbed poisonous CO intermediates by facilitating oxidation to CO 2 .S econd, the "OH carpet" created by metal oxidesc ould precludeP t, Pd, or their alloys with other metals (e.g.,R h, Ru) from reacting with water to form compounds with ÀOH species, making them in lowcoordination states and available for ethanol oxidation.…”

Section: Noble-metal-based Composite Nanocatalysts For the Eormentioning

confidence: 99%

Nanocatalysts for Electrocatalytic Oxidation of Ethanol

et al. 2019

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The use of ethanol as a fuel in direct alcohol fuel cells depends not only on its ease of production from renewable sources, but also on overcoming the challenges of storage and transportation. In an ethanol‐based fuel cell, highly active electrocatalysts are required to break the C−C bond in ethanol for its complete oxidation at lower overpotentials, with the aim of increasing the cell performance, ethanol conversion rates, and fuel efficiency. In recent decades, the development of wet‐chemistry methods has stimulated research into catalyst design, reactivity tailoring, and mechanistic investigations, and thus, created great opportunities to achieve efficient oxidation of ethanol. In this Minireview, the nanomaterials tested as electrocatalysts for the ethanol oxidation reaction in acid or alkaline environments are summarized. The focus is mainly on nanomaterials synthesized by using wet‐chemistry methods, with particular attention on the relationship between the chemical and physical characteristics of the catalysts, for example, catalyst composition, morphology, structure, degree of alloying, presence of oxides or supports, and their activity for ethanol electro‐oxidation. As potential alternatives to noble metals, non‐noble‐metal catalysts for ethanol oxidation are also briefly reviewed. Insights into further enhancing the catalytic performance through the design of efficient electrocatalysts are also provided.

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Sol–gel derived WOx and WOx/Pt films for direct methanol fuel cell catalyst applications

Cited by 50 publications

References 24 publications

Effect of W on PtSn/C catalysts for ethanol electrooxidation

Effect of W on PtSn/C catalysts for ethanol electrooxidation

Platinum Alloys as Anode Catalysts for Direct Methanol Fuel Cells

Nanocatalysts for Electrocatalytic Oxidation of Ethanol

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