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2 results on '"Swiss Federal Institute of Technology. Faculty of Basic Science"'

1. Platinum particles deposited on synthetic boron-doped diamond surfaces: application to methanol oxidation

Author

Universidad de Alicante. Departamento de Química Física, Swiss Federal Institute of Technology. Faculty of Basic Science, Montilla, Francisco, Morallon, Emilia, Duo, Ilaria, Comninellis, Christos, Vázquez Picó, José Luis, Universidad de Alicante. Departamento de Química Física, Swiss Federal Institute of Technology. Faculty of Basic Science, Montilla, Francisco, Morallon, Emilia, Duo, Ilaria, Comninellis, Christos, and Vázquez Picó, José Luis

Abstract

Two methods have been used for the deposition of Pt particles on synthetic boron-doped diamond (BDD) surfaces: chemical deposition and electrodeposition under potentiostatic conditions. However, electrodeposition leads much higher platinum dispersion than chemical deposition. The mechanism of nucleation and growing of the electrodeposited platinum was investigated by means of chronoamperometric studies in acid medium. The electrodeposition on diamond surfaces shows a mechanism of progressive nucleation as deduced from the chronoamperometric studies in acid medium. The stability of the deposited platinum is very low and the platinum particle are dissolved/detached by cycling. The modified BDD electrodes by deposition of platinum have been tested for the oxidation of methanol, showing that multi-step deposition results in higher values of surface and mass activities for methanol oxidation than one-step deposition process.

Published
2003

2. Platinum particles deposited on synthetic boron-doped diamond surfaces. Application to methanol oxidation

Author

J.L. Vázquez, Ch. Comninellis, Emilia Morallón, Francisco Montilla, I. Duo, Universidad de Alicante. Departamento de Química Física, Swiss Federal Institute of Technology. Faculty of Basic Science, and Electrocatálisis y Electroquímica de Polímeros

Subjects
Synthetic diamond, Ciencia de Materiales, Chemistry, General Chemical Engineering, Nucleation, Diamond, Mineralogy, chemistry.chemical_element, Methanol oxidation, engineering.material, Electrocatalyst, Electrochemistry, Platinum catalyst, law.invention, Catalysis, Electrodeposition, Chemical engineering, Diamond electrodes, law, engineering, Deposition (phase transition), Química Física, Electrocatalysis, Platinum
Abstract

Two methods have been used for the deposition of Pt particles on synthetic boron-doped diamond (BDD) surfaces: chemical deposition and electrodeposition under potentiostatic conditions. However, electrodeposition leads much higher platinum dispersion than chemical deposition. The mechanism of nucleation and growing of the electrodeposited platinum was investigated by means of chronoamperometric studies in acid medium. The electrodeposition on diamond surfaces shows a mechanism of progressive nucleation as deduced from the chronoamperometric studies in acid medium. The stability of the deposited platinum is very low and the platinum particle are dissolved/detached by cycling. The modified BDD electrodes by deposition of platinum have been tested for the oxidation of methanol, showing that multi-step deposition results in higher values of surface and mass activities for methanol oxidation than one-step deposition process. Ministerio de Ciencia y Tecnología (MAT2001-1007)

Published
2003
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