AustralieFrV1, Main, Exploration, bibRecord, 006A22

Imaging decorated platinum single crystal electrodes by scanning electrochemical microscopy

Identifieur interne : 006A22 ( Main/Exploration ); précédent : 006A21; suivant : 006A23

Imaging decorated platinum single crystal electrodes by scanning electrochemical microscopy

Auteurs : C. M. Sanchez-Sanchez [Espagne] ; J. Souza-Garcia [Espagne] ; A. Saez [Espagne] ; V. Montiel [Espagne] ; E. Herrero [Espagne] ; A. Aldaz [Espagne] ; J. M. Feliu [Espagne]

Source :

Electrochimica acta [ 0013-4686 ] ; 2011.

RBID : Pascal:12-0327000

Descripteurs français

Pascal (Inist)
- Décoration, Platine, Monocristal, Electrode, Nanoparticule, Oxygène, Réduction chimique, Pile combustible, Electrocatalyse, Matériau modifié, Catalyseur sur support, Carbone, Orientation cristalline, Microscopie champ proche, Réaction électrochimique, Ethylène(tétrafluoro) copolymère, Ionomère, Sulfonate copolymère, Membrane échangeuse cation, Nafion, Microscopie électrochimique à balayage.
Wicri :
- topic : Platine, Oxygène, Carbone.

English descriptors

KwdEn :
- Carbon, Cation exchange membrane, Chemical reduction, Crystal orientation, Decoration, Electrocatalysis, Electrochemical reaction, Electrodes, Fuel cell, Ionomer, Modified material, Nanoparticle, Oxygen, Platinum, Scanning electrochemical microscopy, Scanning probe microscopy, Single crystal, Sulfonate copolymer, Supported catalyst, Tetrafluoroethylene copolymer.

Abstract

Platinum single crystal electrodes, Pt(hk1), represent ideal materials where studying surface sensitive reactions such as oxygen reduction reaction (ORR). Moreover, there is a great interest in testing carbon supported electrocatalyts mixed with Nafion® ionomer in order to directly evaluate catalysts under practical fuel cell conditions. Thus, we provide a first imaging attempt by scanning electrochemical microscopy (SECM) to locally evaluate the electrocatalytic activity during ORR on a Pt(111) single crystal electrode decorated with spots of commercial carbon supported platinum nanoparticles entrapped in Nafion®. Both electrocatalysts present the same chemical composition and then, total surface area, particle size and crystallographic orientation at the electrode surface are the effects studied. Our SECM images prove that the peroxide pathway can also be considered a relevant reaction route on platinum electrodes. We agree with some recent reports pointing the Nafion® content and the three-dimensional surface electrode area as key factors to control for achieving a proper evaluation of the apparent number of electrons exchanged during ORR.

Affiliations:

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Le document en format XML

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<term>Crystal orientation</term>
<term>Decoration</term>
<term>Electrocatalysis</term>
<term>Electrochemical reaction</term>
<term>Electrodes</term>
<term>Fuel cell</term>
<term>Ionomer</term>
<term>Modified material</term>
<term>Nanoparticle</term>
<term>Oxygen</term>
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<term>Supported catalyst</term>
<term>Tetrafluoroethylene copolymer</term>
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<term>Platine</term>
<term>Monocristal</term>
<term>Electrode</term>
<term>Nanoparticule</term>
<term>Oxygène</term>
<term>Réduction chimique</term>
<term>Pile combustible</term>
<term>Electrocatalyse</term>
<term>Matériau modifié</term>
<term>Catalyseur sur support</term>
<term>Carbone</term>
<term>Orientation cristalline</term>
<term>Microscopie champ proche</term>
<term>Réaction électrochimique</term>
<term>Ethylène(tétrafluoro) copolymère</term>
<term>Ionomère</term>
<term>Sulfonate copolymère</term>
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<term>Microscopie électrochimique à balayage</term>
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<front><div type="abstract" xml:lang="en">Platinum single crystal electrodes, Pt(hk1), represent ideal materials where studying surface sensitive reactions such as oxygen reduction reaction (ORR). Moreover, there is a great interest in testing carbon supported electrocatalyts mixed with Nafion® ionomer in order to directly evaluate catalysts under practical fuel cell conditions. Thus, we provide a first imaging attempt by scanning electrochemical microscopy (SECM) to locally evaluate the electrocatalytic activity during ORR on a Pt(111) single crystal electrode decorated with spots of commercial carbon supported platinum nanoparticles entrapped in Nafion®. Both electrocatalysts present the same chemical composition and then, total surface area, particle size and crystallographic orientation at the electrode surface are the effects studied. Our SECM images prove that the peroxide pathway can also be considered a relevant reaction route on platinum electrodes. We agree with some recent reports pointing the Nafion® content and the three-dimensional surface electrode area as key factors to control for achieving a proper evaluation of the apparent number of electrons exchanged during ORR.</div>
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Imaging decorated platinum single crystal electrodes by scanning electrochemical microscopy

Imaging decorated platinum single crystal electrodes by scanning electrochemical microscopy

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri