Novel catalyst-support interaction for direct formic acid fuel cell anodes: Pd electrodeposition on surface-modified graphite felt

The electrodeposition of Pd on graphite felt (GF, thickness ~3 mm in uncompressed state) was studied and the resulting catalyst was compared with Pt-Ru/GF for the electro-oxidation of formic acid. A micellar solution composed of the non-ionic surfactant Triton X-102 and an aqueous phase containing P...

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Bibliographic Details
Published in:Journal of applied electrochemistry 2009-10, Vol.39 (10), p.1925-1938
Main Authors: Cheng, Tommy T., Gyenge, Előd L.
Format: Article
Language:English
Subjects:
Anodes
Catalysts
Chemistry
Chemistry and Materials Science
Electrochemistry
Electrodeposition
Formic acid
Industrial Chemistry/Chemical Engineering
Original Paper
Palladium
Physical Chemistry
Pretreatment
Surface chemistry
Surfactants
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Summary:The electrodeposition of Pd on graphite felt (GF, thickness ~3 mm in uncompressed state) was studied and the resulting catalyst was compared with Pt-Ru/GF for the electro-oxidation of formic acid. A micellar solution composed of the non-ionic surfactant Triton X-102 and an aqueous phase containing PdCl 2 were utilized for the galvanostatic electrodeposition of Pd nanoparticles. The presence of the surfactant during electrodeposition coupled with pretreatment of the GF surface by a Shipley-type method (PdCl 2  + SnCl 2 solution) creating nucleation sites had a major impact on the Pd catalyst morphology and penetration throughout the electrode thickness, affecting, therefore, the electrocatalytic activity toward formic acid oxidation. It was found that large (~1,000 nm) Pd particles with smooth surface favored the indirect CO ad pathway, while Pd nanoparticles (diameter
ISSN:0021-891X
1572-8838
DOI:10.1007/s10800-009-9901-7