Stability of nanostructured Pt/glassy carbon electrodes prepared by colloidal lithography
2008 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, Vol. 155, no 3, K50-K58 p.Article in journal (Refereed) Published
The stability of nanostructured Pt/glassy carbon (GC) model electrodes upon exposure to a realistic electrochemical/electrocatalytic reaction environment (continuous reaction, continuous electrolyte flow) was studied by microscopic techniques, X-ray photoelectron spectroscopy, and electrochemical measurements. The model electrodes consist of Pt nanostructures with well-defined sizes and regular spacing on planar GC substrates, and were fabricated using colloidal lithography techniques. Additional plasma treatments of the GC substrates prior to Pt deposition were tested to improve the stability of the resulting Pt/GC model electrodes. Both evaporation and sputter deposition were used for Pt-film fabrication. The model catalysts prepared by Pt evaporation were found to be rather unstable. The stability was significantly improved for sputter-deposited Pt films, and Pt sputter deposition on a GC substrate, pretreated first in oxygen plasma and then in Ar plasma, resulted in stable model electrodes with a fully intact layer of Pt nanostructures after the electrocatalytic experiments.
Place, publisher, year, edition, pages
2008. Vol. 155, no 3, K50-K58 p.
co monolayer oxidation, rotating-disk electrode, planar model, catalysts, fuel-cell catalyst, high-surface-area, glassy-carbon, platinum dissolution, pt-ru, electrooxidation, dems
IdentifiersURN: urn:nbn:se:kth:diva-17343DOI: 10.1149/1.2829886ISI: 000253472900069ScopusID: 2-s2.0-38349141630OAI: oai:DiVA.org:kth-17343DiVA: diva2:335387
QC 201005252010-08-052010-08-05Bibliographically approved