Synthesis of Pt–Mo/Carbon Nanocomposites from Single-Source Molecular Precursors: A (1:1) PtMo/C PEMFC Anode Catalyst Exhibiting CO Tolerance*

Kwiatkowski, Krzysztof C.; Milne, Stephen; Mukerjee, Sanjeev; Lukehart, Charles M.

doi:10.1007/s10876-005-4547-z

Cited by 11 publications

(6 citation statements)

References 13 publications

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“…With metallic Pt sites continuing to enable effective dehydrogenation and C–C bond cleavage, the kinetics extracted from APR also proposed that the improved reforming turnover frequency with possible hydrogen production enhancement can be attributed to (1) improved tolerance toward CO poisoning due to weaker binding on the active Pt sites − and (2) promoted water–gas shift reaction by Mo oxides to consume CO and increase hydrogen production. , …”

Section: Resultsmentioning

confidence: 99%

Understanding Polyol Decomposition on Bimetallic Pt–Mo Catalysts—A DFT Study of Glycerol

et al. 2015

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Catalytic dehydrogenation and C−C and C−O bond cleavage for glycerol decomposition on bimetallic Pt−Mo alloy model catalysts are studied using periodic density functional theory. The scaling relationship developed for monometallic systems for fast binding energy prediction has been tested and validated on both Ptskin and Pt 3 Mo-skin bimetallic surfaces. Using only the binding energies of atomic C and O for corresponding alloy surfaces, this simple relationship is shown to be an extremely efficient approach to speeding up the catalytic trend analysis for bimetallic alloy catalysts. Similar to Pt(111), it is found that the Pt-skin surface also favors dehydrogenation via C−H bond cleavage and faster C−C bond cleavage over C−O bond cleavage, but the overall activity decreases compared with pure Pt. On Pt 3 Mo-skin surfaces, the overall reaction becomes much more exothermic, but Mo species significantly affect the selectivity by favoring the C−O bond cleavage. Thermodynamic analyses also predict that surface Mo species can be easily oxidized under typical reforming conditions, forming molybdate clusters and severely altering surface structures and potentially catalytic properties. Guided by experimental observations, this study also explores possible bifunctional characteristics for Pt−Mo bimetallic catalysts responsible for improved reforming activity and hydrogen production rates.

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Section: Resultsmentioning

confidence: 99%

Understanding Polyol Decomposition on Bimetallic Pt–Mo Catalysts—A DFT Study of Glycerol

et al. 2015

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“…Therefore, the utility of a second metal that can act as a promoter by providing oxygenated species at lower potentials for oxidative removal of adsorbed CO has been investigated [67,68]. Subsequently, many binary and multimetallic Pt-based alloy compositions, such as Pt/Ru, Pt/Os, Pt/Sn, Pt/Mo, Pt/Ir, Pt/Ru/Sn/W and Pt/Ru/Sn, have been proposed for the purpose of improving the electrooxidation of CH 3 OH [67][68][69][70][71][72][73][74][75][76][77]. However, the use of Pt in combination with non-noble metals as an anodic catalyst material for CH 3 OH electro-oxidation poses two major limitations: (i) uncertainty over long-term stability; and (ii) uncertainty and time dependence of the available active surface area due to a leaching out effect.…”

Section: Electrode Kinetic Limitationsmentioning

confidence: 99%

An overview of unsolved deficiencies of direct methanol fuel cell technology: factors and parameters affecting its widespread use

Kumar

Dutta

Das

et al. 2014

Int. J. Energy Res.

109

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SUMMARY Direct methanol fuel cells (DMFCs) have evolved over the years as a potential candidate for application as a power source in portable electronic devices and in transportation sectors. They have certain associated advantages, including high energy and power densities, ease of fuel storage and handling, ability to be fabricated with small size, minimum emission of pollutants, low cost, ready availability of fuel and solubility of fuel in aqueous electrolytes. However, in spite of several years of active research involved in the development of DMFC technology, their chemical‐to‐electrical energy conversion efficiencies are still lower compared with other alternative power sources traditionally used. This review paper will focus on the existing issues associated with DMFC technology and will also suggest on the possible developmental necessities required for this technology to realize its practical potentials. Copyright © 2014 John Wiley & Sons, Ltd.

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“…Annealing at higher temperatures decreases observed coercivity due to particle sintering and to phase separation at temperatures of 800 °C or above 11 Sintering effects have been reduced by using rapid thermal annealing (annealing times of only 5 s), 12 by binding fcc FePt nanoparticles to the surface of oxidized Si wafers prior to annealing, 13 by intentional use of Fe-oxide surface passivation, 5,14 by coating fcc FePt nanoparticles with a silica shell, 15 or by annealing preformed fcc FePt nanoparticles on NaCl as a support. 16 As part of a continuing study of the preparation of metal alloy nanoparticles using single-source molecular precursors, [17][18][19][20][21] we now report (1) the direct synthesis of fct FePt nanoparticles (5-55 nm in diameter) by thermal reduction of a (1:1) Fe, Pt-dinuclear precursor deposited onto a water-soluble solid support, and (2) subsequent size selection of as-prepared ferromagnetic FePt nanoparticles by fractional precipitation using functionalized long-chain PEG molecular surfactants. This synthesis strategy provides a onestep, solid-state preparation of fct FePt nanoparticles on a readily removal solid support and a protocol for effecting significant size selection of ferromagnetic nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Direct Synthesis and Size Selection of Ferromagnetic FePt Nanoparticles

et al. 2007

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A one-step synthesis of L10 FePt nanoparticles ca. 17.0 nm in diameter by reductive decomposition of the single-source precursor, FePt(CO)4dppmBr2, on a water-soluble support (Na2CO3) is demonstrated. Direct conversion of a FePt(CO)4dppmBr2/Na2CO3 composite to a L10 FePt/Na2CO3 nanocomposite occurs at 600 °C under getter gas with metal-ion reduction and minimal nanoparticle coalescence. Triturating the resulting nanocomposite with water simultaneously dissolves the sodium carbonate solid support and precipitates the formed fct FePt nanoparticles. As-prepared FePt nanoparticles are ferromagnetic and exhibit coercivities of 14.5 kOe at 300 K and 21.8 kOe at 5 K. When capped by functionalized methoxypoly(ethylene glycol) surfactant molecules, as-prepared, polydisperse ferromagnetic FePt nanoparticles can be dispersed and size-selected by fractional precipitation.

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Synthesis of Pt–Mo/Carbon Nanocomposites from Single-Source Molecular Precursors: A (1:1) PtMo/C PEMFC Anode Catalyst Exhibiting CO Tolerance*

Cited by 11 publications

References 13 publications

Understanding Polyol Decomposition on Bimetallic Pt–Mo Catalysts—A DFT Study of Glycerol

Understanding Polyol Decomposition on Bimetallic Pt–Mo Catalysts—A DFT Study of Glycerol

An overview of unsolved deficiencies of direct methanol fuel cell technology: factors and parameters affecting its widespread use

Direct Synthesis and Size Selection of Ferromagnetic FePt Nanoparticles

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