Výsledky vyhledávání - "Patrick Urchaga"

Conductive Polymer Grafting Platinum Nanoparticles as Efficient Catalysts for the Oxygen Reduction Reaction: Influence of the Polymer Structure

Autor: Patrick Urchaga, Pierrick Buvat, Agathe Frelon, Stève Baranton, Delphine Dru, Christophe Coutanceau, Janick Bigarré

Publikováno v: Electrocatalysis
Electrocatalysis, Springer, 2018, 9 (5), pp.640-651. ⟨10.1007/s12678-018-0479-x⟩
Electrocatalysis, 2018, 9 (5), pp.640-651. ⟨10.1007/s12678-018-0479-x⟩

International audience; Platinum nanoparticles supported on a carbon support (Pt-NPs/C) were synthesized by a polyol method and modified by grafting of different non-fluorinated and fluorinated proton conducting polymers. In the case of fluorinated p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::edd694b3f8427f64bf8c21a13eaec202
https://doi.org/10.1007/s12678-018-0479-x

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Catalyst Degradation in Fuel Cell Electrodes: Accelerated Stress Tests and Model-based Analysis

Autor: Steven G. Rinaldo, Patrick Urchaga, Michael Eikerling, Wendy Lee, Thomas Kadyk, Cynthia A. Rice, Chris Richards, Jingwei Hu, Antonio O. Pistono

Publikováno v: Electrochimica Acta. 176:1500-1510

Catalyst degradation is the major hurdle in the development of polymer electrolyte fuel cells for automotive applications. This article presents an analysis of degradation data obtained in accelerated stress tests under ex situ conditions. The influe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ff72ef573d7ff6d2d8b4aca51d3268c9
https://doi.org/10.1016/j.electacta.2015.03.152

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Interfacial structure of atomically flat polycrystalline Pt electrodes and modified Sauerbrey equation

Autor: Christophe Coutanceau, Stève Baranton, Patrick Urchaga, Jutae Kim, Gregory Jerkiewicz

Publikováno v: Physical Chemistry Chemical Physics
Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2017, 19 (33), pp.21955-21963. ⟨10.1039/c7cp02528a⟩

The electrochemical quartz-crystal nanobalance (EQCN) measures in situ mass changes associated with interfacial electrode processes. Real electrodes are not atomically flat, thus their surface roughness affects the conversion of frequency variations

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c060d066449889776e4060ec602b09ea
https://hal.archives-ouvertes.fr/hal-03103844

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Evidence of an Eley–Rideal Mechanism in the Stripping of a Saturation Layer of Chemisorbed CO on Platinum Nanoparticles

Autor: Stève Baranton, Patrick Urchaga, Gregory Jerkiewicz, Christophe Coutanceau

Publikováno v: Langmuir
Langmuir, American Chemical Society, 2012, 28 (36), pp.13094-104. ⟨10.1021/la302388p⟩

International audience; The oxidative stripping of a saturation layer of CO(chem) was studied on platinum nanoparticles of high shape selectivity and narrow size distribution. Nanospheres, nanocubes, and nano-octahedrons were synthesized using the wa

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::25a273c5bf7333d165e6b55bd4e90747
https://doi.org/10.1021/la302388p

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Selective Syntheses and Electrochemical Characterization of Platinum Nanocubes and Nanotetrahedrons/Octahedrons

Autor: Teko W. Napporn, Stève Baranton, Patrick Urchaga, Christophe Coutanceau

Publikováno v: ELECTROCATALYSIS
ELECTROCATALYSIS, 2010, 1 pp.3-6 ⟨10.1007/s12678-009-0002-5⟩

International audience; Platinum nanocubes and tetrahedrons/octahedrons were synthesized by different methods using different surfactants (tetradecyltrimethylammonium bromide (TTAB) and sodium polyacrylate). Transmission electron microscopy (TEM) inv

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9c4597958e551dde2c2a82ca9d9e25b8
https://doi.org/10.1007/s12678-009-0002-5

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Theoretical analysis of electrochemical surface-area loss in supported nanoparticle catalysts

Autor: Patrick Urchaga, Michael Eikerling, Wendy Lee, Cynthia A. Rice, Jürgen Stumper, Steven G. Rinaldo, Jingwei Hu

Publikováno v: Physical chemistry chemical physics : PCCP. 16(48)

In polymer electrolyte fuel cells a decrease in catalytic surface-area within the cathode catalyst layer is a critical barrier to commercialization. This loss in catalytic surface-area manifests as a loss in cell voltage and thus power density of the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::78774ce1d8b8be694d99326bf88e7dfb
https://pubmed.ncbi.nlm.nih.gov/25375887

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Changes in COchem oxidative stripping activity induced by reconstruction of Pt (111) and (100) surface nanodomains

Autor: Christophe Coutanceau, Patrick Urchaga, Stève Baranton

Publikováno v: Electrochimica Acta
Electrochimica Acta, Elsevier, 2013, 92, pp.438-445. ⟨10.1016/j.electacta.2013.01.042⟩

The Hupd and COchem oxidative stripping on preferentially oriented Pt nanoparticles exhibiting clean surfaces and different ratios of (1 0 0) and (1 1 1) surface domains are investigated in 0.5 M H2SO4 aqueous electrolyte. Shorter range order (1 0 0)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6d09412d7f6925308da0d6c803383c34
https://hal.archives-ouvertes.fr/hal-00942882

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Platinum Activity for CO Electrooxidation: from Single Crystal Surfaces to Nanosurfaces and Real Fuel Cell Nanoparticles

Autor: Stève Baranton, Christophe Coutanceau, Patrick Urchaga, Claude Lamy

Publikováno v: ELECTROCATALYSIS
ELECTROCATALYSIS, 2012, 3 (3-4), pp.304-312. ⟨10.1007/s12678-012-0089-y⟩

International audience; The understanding of CO oxidation on platinum catalysts is a key point in several low-temperature fuel cell technologies: direct-alcohol fuel cells or proton-exchange membrane fuel cell fed with reformate hydrogen, for example

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ec6ca8388dcd09847eaeff728014a82b
https://hal.archives-ouvertes.fr/hal-00798357

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Colloidal Syntheses of Shape- and Size-Controlled Pt Nanoparticles for Electrocatalysis

Autor: Sylvain Brimaud, Stève Baranton, Patrick Urchaga, Christophe Coutanceau

Publikováno v: ELECTROCATALYSIS
ELECTROCATALYSIS, 2012, 3 (2), pp.75-87. ⟨10.1007/s12678-012-0079-0⟩

International audience; Different colloidal synthesis methods of platinum nanoparticles with controlled sizes and shapes that are relevant for electrocatalysis studies are reviewed. Four main methods, i.e., water in oil microemulsion (w/o) method, po

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8835edb5ad4515c67ef296287326e9cf
https://hal.archives-ouvertes.fr/hal-00749441

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Electro-oxidation of CO(chem) on Pt nanosurfaces: solution of the peak multiplicity puzzle

Autor: Gregory Jerkiewicz, Christophe Coutanceau, Patrick Urchaga, Stève Baranton

Publikováno v: Langmuir
Langmuir, American Chemical Society, 2012, 28 (7), pp.3658-63. ⟨10.1021/la202913b⟩

International audience; An understanding of the oxidation of chemisorbed CO (CO(chem)) on Pt nanoparticle surfaces is of major importance to fuel cell technology. Here, we report on the relation between Pt nanoparticle surface structure and CO(chem)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::510631a25993bdcfd2ab59b733f3e5df
https://hal.archives-ouvertes.fr/hal-00749429

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