Porous Hollow PtNi/C Electrocatalysts: Carbon Support Considerations to Meet Performance and Stability Requirements

Tristan Asset, Nathalie Job, Yan Busby, Alexandre Crisci, Vincent Martin, Vaios Stergiopoulos, Céline Bonnaud, Alexey Serov, Plamen Atanassov, Raphaël Chattot, Laetitia Dubau, Frédéric Maillard

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

The influence of the texture, structure, and chemistry of different carbon supports on the morphological properties, oxygen reduction reaction (ORR) activity, and stability of porous hollow PtNi nanoparticles (NPs) was investigated. The carbon nanomaterials included carbon blacks, carbon nanotubes, graphene nanosheets, and carbon xerogel and featured different specific surface areas, degrees of graphitization, and extent of surface functionalization. The external and inner diameters of the supported porous hollow PtNi/C NPs were found to decrease with an increase in the carbon mesopore surface area. Despite these differences, similar morphological properties and electrocatalytic activities for the ORR were reported. The stability of the synthesized electrocatalysts was assessed by simulating electrochemical potential variations occurring at a proton exchange membrane fuel cell (PEMFC) cathode during startup/shutdown events. Identical location transmission electron microscopy (IL-TEM) and electrochemical methods revealed the occurrence of a carbon-specific degradation mechanism: carbon corrosion into CO2 and particle detachment were noticed on carbon xerogels and graphene nanosheets while, on carbon blacks, surface oxidation prevailed (C → COsurf) and did not result in modified electrical resistance of the catalytic layers, rendering these carbon supports better suited to prepare highly active and stable ORR electrocatalysts.

langue originaleAnglais
Pages (de - à)893-903
Nombre de pages11
journalACS Catalysis
Volume8
Numéro de publication2
Les DOIs
étatPublié - 2 févr. 2018

Empreinte digitale

Electrocatalysts
Catalyst supports
Carbon
Soot
Xerogels
Graphite
Nanosheets
Oxygen
Carbon black
Graphene
Nanoparticles
Plant startup
Carbon Nanotubes
Graphitization
Acoustic impedance
Plant shutdowns
Proton exchange membrane fuel cells (PEMFC)
Nanostructured materials
Specific surface area
Carbon nanotubes

Citer ceci

Asset, Tristan ; Job, Nathalie ; Busby, Yan ; Crisci, Alexandre ; Martin, Vincent ; Stergiopoulos, Vaios ; Bonnaud, Céline ; Serov, Alexey ; Atanassov, Plamen ; Chattot, Raphaël ; Dubau, Laetitia ; Maillard, Frédéric. / Porous Hollow PtNi/C Electrocatalysts : Carbon Support Considerations to Meet Performance and Stability Requirements. Dans: ACS Catalysis. 2018 ; Vol 8, Numéro 2. p. 893-903.
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abstract = "The influence of the texture, structure, and chemistry of different carbon supports on the morphological properties, oxygen reduction reaction (ORR) activity, and stability of porous hollow PtNi nanoparticles (NPs) was investigated. The carbon nanomaterials included carbon blacks, carbon nanotubes, graphene nanosheets, and carbon xerogel and featured different specific surface areas, degrees of graphitization, and extent of surface functionalization. The external and inner diameters of the supported porous hollow PtNi/C NPs were found to decrease with an increase in the carbon mesopore surface area. Despite these differences, similar morphological properties and electrocatalytic activities for the ORR were reported. The stability of the synthesized electrocatalysts was assessed by simulating electrochemical potential variations occurring at a proton exchange membrane fuel cell (PEMFC) cathode during startup/shutdown events. Identical location transmission electron microscopy (IL-TEM) and electrochemical methods revealed the occurrence of a carbon-specific degradation mechanism: carbon corrosion into CO2 and particle detachment were noticed on carbon xerogels and graphene nanosheets while, on carbon blacks, surface oxidation prevailed (C → COsurf) and did not result in modified electrical resistance of the catalytic layers, rendering these carbon supports better suited to prepare highly active and stable ORR electrocatalysts.",
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Asset, T, Job, N, Busby, Y, Crisci, A, Martin, V, Stergiopoulos, V, Bonnaud, C, Serov, A, Atanassov, P, Chattot, R, Dubau, L & Maillard, F 2018, 'Porous Hollow PtNi/C Electrocatalysts: Carbon Support Considerations to Meet Performance and Stability Requirements', ACS Catalysis, VOL. 8, Numéro 2, p. 893-903. https://doi.org/10.1021/acscatal.7b03539

Porous Hollow PtNi/C Electrocatalysts : Carbon Support Considerations to Meet Performance and Stability Requirements. / Asset, Tristan; Job, Nathalie; Busby, Yan; Crisci, Alexandre; Martin, Vincent; Stergiopoulos, Vaios; Bonnaud, Céline; Serov, Alexey; Atanassov, Plamen; Chattot, Raphaël; Dubau, Laetitia; Maillard, Frédéric.

Dans: ACS Catalysis, Vol 8, Numéro 2, 02.02.2018, p. 893-903.

Résultats de recherche: Contribution à un journal/une revueArticle

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T1 - Porous Hollow PtNi/C Electrocatalysts

T2 - Carbon Support Considerations to Meet Performance and Stability Requirements

AU - Asset, Tristan

AU - Job, Nathalie

AU - Busby, Yan

AU - Crisci, Alexandre

AU - Martin, Vincent

AU - Stergiopoulos, Vaios

AU - Bonnaud, Céline

AU - Serov, Alexey

AU - Atanassov, Plamen

AU - Chattot, Raphaël

AU - Dubau, Laetitia

AU - Maillard, Frédéric

PY - 2018/2/2

Y1 - 2018/2/2

N2 - The influence of the texture, structure, and chemistry of different carbon supports on the morphological properties, oxygen reduction reaction (ORR) activity, and stability of porous hollow PtNi nanoparticles (NPs) was investigated. The carbon nanomaterials included carbon blacks, carbon nanotubes, graphene nanosheets, and carbon xerogel and featured different specific surface areas, degrees of graphitization, and extent of surface functionalization. The external and inner diameters of the supported porous hollow PtNi/C NPs were found to decrease with an increase in the carbon mesopore surface area. Despite these differences, similar morphological properties and electrocatalytic activities for the ORR were reported. The stability of the synthesized electrocatalysts was assessed by simulating electrochemical potential variations occurring at a proton exchange membrane fuel cell (PEMFC) cathode during startup/shutdown events. Identical location transmission electron microscopy (IL-TEM) and electrochemical methods revealed the occurrence of a carbon-specific degradation mechanism: carbon corrosion into CO2 and particle detachment were noticed on carbon xerogels and graphene nanosheets while, on carbon blacks, surface oxidation prevailed (C → COsurf) and did not result in modified electrical resistance of the catalytic layers, rendering these carbon supports better suited to prepare highly active and stable ORR electrocatalysts.

AB - The influence of the texture, structure, and chemistry of different carbon supports on the morphological properties, oxygen reduction reaction (ORR) activity, and stability of porous hollow PtNi nanoparticles (NPs) was investigated. The carbon nanomaterials included carbon blacks, carbon nanotubes, graphene nanosheets, and carbon xerogel and featured different specific surface areas, degrees of graphitization, and extent of surface functionalization. The external and inner diameters of the supported porous hollow PtNi/C NPs were found to decrease with an increase in the carbon mesopore surface area. Despite these differences, similar morphological properties and electrocatalytic activities for the ORR were reported. The stability of the synthesized electrocatalysts was assessed by simulating electrochemical potential variations occurring at a proton exchange membrane fuel cell (PEMFC) cathode during startup/shutdown events. Identical location transmission electron microscopy (IL-TEM) and electrochemical methods revealed the occurrence of a carbon-specific degradation mechanism: carbon corrosion into CO2 and particle detachment were noticed on carbon xerogels and graphene nanosheets while, on carbon blacks, surface oxidation prevailed (C → COsurf) and did not result in modified electrical resistance of the catalytic layers, rendering these carbon supports better suited to prepare highly active and stable ORR electrocatalysts.

KW - carbon supported porous hollow Pt-based nanoparticles

KW - oxygen reduction reaction

KW - startup/shutdown events

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U2 - 10.1021/acscatal.7b03539

DO - 10.1021/acscatal.7b03539

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