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
Henrik Ekström
Kungliga Tekniska Högskolan (KTH)
Per Hanarp
Kompetenscentrum katalys
Chalmers, Teknisk fysik, Kemisk fysik
Lisa Eurenius
Kompetenscentrum katalys
Chalmers, Teknisk fysik, Mikroskopi och mikroanalys
Göran Lindbergh
Kungliga Tekniska Högskolan (KTH)
Eva Olsson
Chalmers, Teknisk fysik, Mikroskopi och mikroanalys
Kompetenscentrum katalys
Bengt Herbert Kasemo
Kompetenscentrum katalys
Chalmers, Teknisk fysik, Kemisk fysik
Journal of Power Sources
0378-7753 (ISSN)
Vol. 163 2 671-678Ämneskategorier
Den kondenserade materiens fysik
DOI
10.1016/j.jpowsour.2006.10.005