Oxygen reduction on carbon supported Pt-W electrocatalysts

Meza, Doralice; Morales, Ulises; Roquero, Pedro; Salgado, Leonardo

doi:10.1016/j.ijhydene.2009.07.021

Cited by 20 publications

(7 citation statements)

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“…In order to explore the activity of various catalyst materials, to deduce their structure-activity relationships, and to elucidate the roles of electrode poisons and each component in cocatalysts, these reactions have been extensively studied on single [1][2][3][4] and multi-component [5][6][7][8][9] metal catalysts. In order to optimize the electrode structure or to study the influence of polymer electrolyte film on the mass transport and the reaction kinetics, the reactions have been also investigated at polymer electrolyte modified electrodes [10][11][12].…”

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confidence: 99%

Mass transport and kinetics of electrochemical oxygen reduction at nanostructured platinum electrode and solid polymer electrolyte membrane interface

Jiang

Kucernak

2012

J Solid State Electrochem

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Oxygen reduction reaction (orr) at nanostructured Pt electrode in a flooded polymer electrolyte membrane fuel cell environment has been investigated using a nanoporous Pt-Nafion membrane composite microelectrode by means of steady-state voltammetry and chronoamperometry. The interfacial mass transport of dissolved oxygen is characterized by comparable diffusion coefficients and lower concentrations as compared with literature data obtained with a humidified membrane. The exchange current densities measured at the nanoporous Pt and membrane interface are higher than those reported for the orr in acidic solutions or at polycrystalline Pt and Nafion membrane interface, indicating the improvement of the orr kinetics. Increasing temperature substantially improves the orr kinetics and accelerates the diffusion of oxygen, as expected by their Arrhenius behavior. At the nanoporous Pt and membrane interface, the Tafel plot exhibits an unusual slope of around 240 mV dec −1 at high overpotentials. This Tafel slope doubling the value of 120 mV dec −1 normally reported for the orr in acidic media and at the polycrystalline Pt and membrane interface is a signature of non-uniform polarization of the nanoporous Pt electrode on the membrane which origins have been discussed.been recently the focus of many academic and industrial investigations due to their high power density and low operation temperature, and as a result, the oxygen reduction reaction (orr) has received extensive attention. In order to explore the activity of various catalyst materials, to deduce their structure-activity relationships, and to elucidate the roles of electrode poisons and each component in cocatalysts, these reactions have been extensively studied on single [1-4] and multi-component [5-9] metal catalysts. In order to optimize the electrode structure or to study the influence of polymer electrolyte film on the mass transport and the reaction kinetics, the reactions have been also investigated at polymer electrolyte modified electrodes [10][11][12]. Recently, the preparation of nanoparticulate catalysts is one potential area which can provide the necessary technological advances to fuel cell technology [13]. Interest in the application of nanostructured catalysts results from the unique electronic structure of the nanosized metal particles and their highly developed surface areas. This character is essential for the optimum functioning of a catalyst as the chemical reaction takes place on the surface of the particle.To understand the kinetics of the orr on the nanostrucutured catalysts and their structure-activity relationships is therefore of urgent interests. A pronounced size effect of platinum for the orr has been disclosed [14,15]. An optimum diameter of the catalyst particles has been suggested as about 2-3 nm. The

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confidence: 99%

Mass transport and kinetics of electrochemical oxygen reduction at nanostructured platinum electrode and solid polymer electrolyte membrane interface

Jiang

Kucernak

2012

J Solid State Electrochem

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“…A typical XRD pattern exhibiting only two broad peaks was obtained for the W nanoparticles on the carbon‐support. The absence of any sharp diffraction peaks in the XRD pattern is due to the amorphous nature of the as‐synthesized W nanoparticles ,,. The XRD data for the W@Pt/C catalyst had four obvious diffraction peaks corresponding to the (111), (200), (220), and (311) planes of the face‐centered cubic (fcc) Pt structure (PDF#65‐2868).…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the transition metal W has good corrosion resistance in acidic media and has been used along with Pt as an anodic material . It has also been reported that Pt−W materials enhance the catalytic activity for multiple reactions including oxidation of adsorbed CO and oxygen reduction ,,. From the DFT calculations results, Pt also has negative alloy formation energies with W and very strong surface segregation tendency in Pt−W alloys.…”

Section: Introductionmentioning

confidence: 83%

“…However, several remaining obstacles must be overcome in order for successful fuel cell commercialization, such as the slow kinetics of the oxygen reduction reaction (ORR) on the cathode, the high costs and low utilization of noble metals in the apparatus, and insufficient durability and low poisoning tolerance of the catalysts . Throughout the past decade researchers have investigated multifarious catalysts in hopes of solving these problems ,…”

Section: Introductionmentioning

confidence: 99%

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Carbon‐Supported W@Pt Nanoparticles with a Pt‐Enriched Surface as a Robust Electrocatalyst for Oxygen Reduction Reactions

et al. 2018

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A carbon‐supported surface‐platinum‐enriched tungsten nanoparticles (W@Pt/C) is successfully prepared via a replacement method. X‐ray diffraction results verify that the prepared tungsten (W) nanoparticles are amorphous and that platinum (Pt) particles have been successfully placed onto the surface. Transmission electron microscopy shows that the surface‐platinum‐enriched tungsten (W@Pt) nanoparticles are uniformly dispersed on the surface of the carbon support and have an average size of only 1.9 nm. Energy‐dispersive X‐ray spectroscopy reveals that the Pt and W elements are evenly distributed on the surface of the catalyst. Electrochemical measurements confirm that the as‐prepared catalyst exhibits an enhanced catalytic activity for oxygen reduction reaction (ORR) in comparison with commercial catalyst (JM Pt/C). Furthermore, the mass activity of the W@Pt/C catalyst at a potential of 0.9 V/RHE is 2.1 times higher than that of Pt/C (JM). Importantly, the ORR durability of the catalyst is greatly improved as compared to Pt/C (JM). This result may be due to the fact that the mean particle size of the W@Pt/C remains nearly constant during an accelerated durability test. Based on these results, the W@Pt/C maybe a promising cathode catalyst for use in fuel cells.

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“…Carbetos de tungstênio tem sido fonte de investigação para aplicação no cátodo de célula a combustível, pois eles apresentam atividade para catalisar diferentes tipos de reação [44]. Dentre estas reações, pode-se citar: i) reação de desprendimento de hidrogênio [45], [46]; ii) reações de oxidação de metanol e hidrogênio [44], [46]; iii) reação de redução de oxigênio [47]- [51].…”

Section: Carbetos De Tungstêniounclassified

Estudo da atividade e da estabilidade de eletrocatalisadores de Pt suportados em carbono, monocarbeto e dióxido de tungstênio frente a reação de redução de oxigênio

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Oxygen reduction on carbon supported Pt-W electrocatalysts

Cited by 20 publications

References 20 publications

Mass transport and kinetics of electrochemical oxygen reduction at nanostructured platinum electrode and solid polymer electrolyte membrane interface

Mass transport and kinetics of electrochemical oxygen reduction at nanostructured platinum electrode and solid polymer electrolyte membrane interface

Carbon‐Supported W@Pt Nanoparticles with a Pt‐Enriched Surface as a Robust Electrocatalyst for Oxygen Reduction Reactions

Estudo da atividade e da estabilidade de eletrocatalisadores de Pt suportados em carbono, monocarbeto e dióxido de tungstênio frente a reação de redução de oxigênio

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