Issue 44, 2008
From the journal:

Physical Chemistry Chemical Physics

Probe beam deflection studies of nanostructured catalyst materials for fuelcells†

G. García,a   M. M. Bruno,b   G. A. Planes,b   J. L. Rodriguez,a   C. A. Barbero*b  and  E. Pastor*a  

* Corresponding authors

a Departamento de Química Física, Universidad de la Laguna, Tenerife, Spain
E-mail: epastor@ull.es
Fax: +34 (0)922318002
Tel: +34 (0)922318028

b Departamento de Química, Universidad Nacional de Río Cuarto, Río Cuarto, Argentina

Abstract

Probe beam deflection (PBD) techniques, both as cyclic voltadeflectometry (CVD) and chronodeflectometry (CD), were applied for the first time to the study of the electrochemistry of nanostructured Pt materials which are commonly used as electrocatalysts in fuel cells. The electrochemical surface reactions, including faradaic processes, double layer charging and specific anion adsorption were easily detected. Quantitative analysis of the chronodeflectometric data made possible to elucidate the dynamics of double layer charging in such materials and to determine the potential of zero charge (pzc) of the metal present either as a monolithic mesoporous material or as metal nanoparticles supported on carbon. The electro-oxidation of CO, adsorbed on nanostructured Pt, was also studied by CVD and CD being able to detect the formation of CO2 and H3O+ related with the nucleation and growth process which controls the rate of CO stripping. The interplay of Pt oxide formation and COad electrooxidation, both in potential and time, was detected indicating possible application of the technique to other electrocatalysts.

Graphical abstract: Probe beam deflection studies of nanostructured catalyst materials for fuel cells

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Article information

DOI
https://doi.org/10.1039/B806938G
Article type
Paper
Submitted
24 Apr 2008
Accepted
14 Aug 2008
First published
30 Sep 2008

Phys. Chem. Chem. Phys., 2008,10, 6677-6685

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Probe beam deflection studies of nanostructured catalyst materials for fuel cells

G. García, M. M. Bruno, G. A. Planes, J. L. Rodriguez, C. A. Barbero and E. Pastor, Phys. Chem. Chem. Phys., 2008, 10, 6677 DOI: 10.1039/B806938G

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