Thin film Pt/TiO2 catalysts for the polymer electrolyte fuel cell
Artikel i vetenskaplig tidskrift, 2007

Thin film Pt/TiO 2 catalysts are evaluated in a polymer electrolyte electrochemical cell. Individual thin films of Pt and TiO 2 , and bilayers of them, were deposited directly on Nafion membranes by thermal evaporation with varying deposition order and thickness (Pt loadings of 3-6 μg cm -2 ). Structural and chemical characterization was performed by transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Oxygen reduction reaction (ORR) polarization plots show that the presence of a thin TiO 2 layer between the platinum and the Nafion increases the performance compared to a Pt film deposited directly on Nafion. Based on the TEM analysis, we attribute this improvement to a better dispersion of Pt on TiO 2 compared to on Nafion and in addition, substantial proton conduction through the thin TiO 2 layer. It is also shown that deposition order and the film thickness affects the performance. © 2006 Elsevier B.V. All rights reserved.

Författare

Marie Gustavsson

Chalmers, Teknisk fysik, Kemisk fysik

Kompetenscentrum katalys (KCK)

Henrik Ekström

Kungliga Tekniska Högskolan (KTH)

Per Hanarp

Kompetenscentrum katalys (KCK)

Chalmers, Teknisk fysik, Kemisk fysik

Lisa Eurenius

Kompetenscentrum katalys (KCK)

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Göran Lindbergh

Kungliga Tekniska Högskolan (KTH)

Eva Olsson

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Kompetenscentrum katalys (KCK)

Bengt Herbert Kasemo

Kompetenscentrum katalys (KCK)

Chalmers, Teknisk fysik, Kemisk fysik

Journal of Power Sources

0378-7753 (ISSN)

Vol. 163 671-678

Ämneskategorier

Den kondenserade materiens fysik

DOI

10.1016/j.jpowsour.2006.10.005