Influence of the Nanostructure of Palladium Mesoparticles on the Kinetics of Molecular Oxygen Electroreduction
The effect of the nanostructure of electrodeposited palladium mesoparticles on the oxygen electroreduction reaction (oerr) in acid media is studied by electrochemical techniques combined with scanning tunneling microscopy, tapping-mode atomic force microscopy, and scanning electron microscopy. Palla...
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| Formato: | Articulo |
| Lenguaje: | Inglés |
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2004
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/121357 |
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I19-R120-10915-121357 |
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dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Exactas Química Palladium Mesoparticles Electroreduction Highly oriented pyrolytic graphite |
| spellingShingle |
Ciencias Exactas Química Palladium Mesoparticles Electroreduction Highly oriented pyrolytic graphite Hernández Creus, A. Gimeno, Y. Díaz, P. Vázquez, L. González, S. Salvarezza, Roberto Carlos Arvia, Alejandro Jorge Influence of the Nanostructure of Palladium Mesoparticles on the Kinetics of Molecular Oxygen Electroreduction |
| topic_facet |
Ciencias Exactas Química Palladium Mesoparticles Electroreduction Highly oriented pyrolytic graphite |
| description |
The effect of the nanostructure of electrodeposited palladium mesoparticles on the oxygen electroreduction reaction (oerr) in acid media is studied by electrochemical techniques combined with scanning tunneling microscopy, tapping-mode atomic force microscopy, and scanning electron microscopy. Palladium mesoparticles supported on highly oriented pyrolytic graphite (HOPG) exhibit a remarkable electrocatalytic enhancement, i.e., a decrease in the cathodic overvoltage on the order of 0.25 V, as compared to polycrystalline palladium electrodes. For a similar particle size, the largest electrocatalytic activity is obtained by use of quasi-twodimensional (2D) ramified palladium particles and electrodeposited palladium charges exceeding 3 mC cm<sup>-2</sup>. For these particles, experimental results show that the electrocatalytic enhancement of the oerr can be related to the combined influence of the nanostructure of 2D branching on the HOPG and traces of oxygen-containing adsorbates that induces local perturbation of electronic states at palladium mesoparticles. The 2D nature of surfaces increases markedly the reversibility of the first two-electron-transfer step of the oerr. |
| format |
Articulo Articulo |
| author |
Hernández Creus, A. Gimeno, Y. Díaz, P. Vázquez, L. González, S. Salvarezza, Roberto Carlos Arvia, Alejandro Jorge |
| author_facet |
Hernández Creus, A. Gimeno, Y. Díaz, P. Vázquez, L. González, S. Salvarezza, Roberto Carlos Arvia, Alejandro Jorge |
| author_sort |
Hernández Creus, A. |
| title |
Influence of the Nanostructure of Palladium Mesoparticles on the Kinetics of Molecular Oxygen Electroreduction |
| title_short |
Influence of the Nanostructure of Palladium Mesoparticles on the Kinetics of Molecular Oxygen Electroreduction |
| title_full |
Influence of the Nanostructure of Palladium Mesoparticles on the Kinetics of Molecular Oxygen Electroreduction |
| title_fullStr |
Influence of the Nanostructure of Palladium Mesoparticles on the Kinetics of Molecular Oxygen Electroreduction |
| title_full_unstemmed |
Influence of the Nanostructure of Palladium Mesoparticles on the Kinetics of Molecular Oxygen Electroreduction |
| title_sort |
influence of the nanostructure of palladium mesoparticles on the kinetics of molecular oxygen electroreduction |
| publishDate |
2004 |
| url |
http://sedici.unlp.edu.ar/handle/10915/121357 |
| work_keys_str_mv |
AT hernandezcreusa influenceofthenanostructureofpalladiummesoparticlesonthekineticsofmolecularoxygenelectroreduction AT gimenoy influenceofthenanostructureofpalladiummesoparticlesonthekineticsofmolecularoxygenelectroreduction AT diazp influenceofthenanostructureofpalladiummesoparticlesonthekineticsofmolecularoxygenelectroreduction AT vazquezl influenceofthenanostructureofpalladiummesoparticlesonthekineticsofmolecularoxygenelectroreduction AT gonzalezs influenceofthenanostructureofpalladiummesoparticlesonthekineticsofmolecularoxygenelectroreduction AT salvarezzarobertocarlos influenceofthenanostructureofpalladiummesoparticlesonthekineticsofmolecularoxygenelectroreduction AT arviaalejandrojorge influenceofthenanostructureofpalladiummesoparticlesonthekineticsofmolecularoxygenelectroreduction |
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Repositorios |
| _version_ |
1764820449172127748 |