Naslov
A THIN-FILM ROTATING ELECTRODE STUDY: OXYGEN REDUCTION ON CARBON SUPPORTED CATALYSTS

Autori
Grubač, Zoran ; Metikoš-Huković, Mirjana ; Čeralinac, Zoran

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
1^ Regional Symposium on Electrochemistry of South-East Europe, Book of Abstract / Horvat-Radošević, Višnja ; Mandić, Zoran ; Gojo, Miroslav - Zagreb : Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI), 2008, 191-191

ISBN
978-953-6894-33-8

Skup
First Regional Symposium on Electrochemistry of South-East Europe

Mjesto i datum
Rovinj, Hrvatska, 04.05.2008. - 08.05.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
oxygen reduction reaction; thin-film rotating disk electrode; Vulcan XC72 carbon supported mono- and bimetallic catalysts

Sažetak
For the anodic oxidation of hydrogen as well as the catodic reduction of oxygen a commonly used electrocatalyst in low-temperature polymer electrolyte fuel cells is platinum supported on high-surface-area substrates. Of major interest is to develop new or modified catalyst with improved activity for fuel cell applications. The explicit method for comparing the electrocatalytic activity of an alternative high-surface-area catalyst under fuel cell working conditions is to produce a membrane electrode assembly and to measure the catalytic activity in a single cell configuration. In this work, the electrode kinetics of oxygen reduction reaction was studied using thin-film rotating disk electrode (RDE) technique in 0.1 M HClO4 solution in temperature range from 20^oC to 60^oC. The limiting factor of diffusion resistance through the Nafion film was also investigated in the function of temperature. The method involves attaching the catalyst particles to a glassy carbon RDE via a sub-micrometer thick Nafion film. So prepared thin-film RDE avoid or reduces the problems with the mass-transport resistances and/or incomplete wetting of the electrode structure and enables direct extracting of kinetic current densities using the unmodified mass-transport correlations for simple RDE. This allows the direct extrapolation of RDE data on the performance of polymer electrolyte membrane (PEM) fuel cell electrodes. As catalysts, the high surface area Vulcan XC72 carbon supported mono- and bimetallic catalysts (Pt, PtSn, PtRu) were used. A comparative investigation under the same conditions was carried out on the Pt-catalyst, which was used as a model-system.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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